+publisher:"University of Texas – Austin" +contributor:("Matthews, Ronald D.")

University of Texas – Austin

1. Gokkus, Enes. Mist cooling technology for thermoelectric power plants.

Degree: MSin Engineering, Thermal-Fluid Systems, 2014, University of Texas – Austin

► A novel mist-based cooling concept is analyzed with the objective of reducing water consumption in thermoelectric power plants. Additionally, this concept offers the potential to… (more)

▼ A novel mist-based cooling concept is analyzed with the objective of reducing water consumption in thermoelectric power plants. Additionally, this concept offers the potential to increase electricity generation capacity by lowering the steam condensation temperature. The mist-based cooling concept consists of two independent technologies. The first technology consists of replacing the cooling tower with a two stage heat exchanger consisting of air-cooled and water mist-cooled heat exchangers. The mist-cooled heat exchanger chills the cooling water to near wet bulb temperature ambients which enables lowering of condenser pressures and temperatures. The mist is a saturated air stream at wet bulb temperatures obtained by adding water droplets to ambient air. The air-water ratios and droplet sizes can be optimized to reach wet bulb temperatures with minimum water consumption. The enhanced control of evaporation through mist cooling will allow the mist to reach closer to wet bulb temperatures than cooling towers. The second technology consists of replacing the shell-and-tube condenser with a direct contact condenser, wherein the steam from the Rankine cycle condenses on water mist streams. The large area offered by mist droplets increases heat transfer rates significantly, resulting in compact and low maintenance condensers. Technical and techno-economic analyses are carried out to map the potential of mist cooling technology. The technical analyses show that mist cooling technology can reduce water consumption by up to 65 %, compared to present-day cooling towers of the same power output. Furthermore, by reducing the condenser pressure, the electricity generation capacity can be increased by 4 % while still consuming less water than existing cooling towers. First-order techno-economic analyses have also been conducted to quantify the economic benefits of mist cooling for thermoelectric power plants in Texas. These analyses reveal that mist cooling technology can greatly help 17 out of 18 coal-fired power plants in Texas. It is expected that this technology will significantly benefit other U.S. power plants located in water-stressed areas. Advisors/Committee Members: Bahadur, Vaibhav (advisor), Matthews, Ronald D. (committee member).

Subjects/Keywords: Mist cooling; Evaporative cooling

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APA (6^th Edition):

Gokkus, E. (2014). Mist cooling technology for thermoelectric power plants. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/39133

Chicago Manual of Style (16^th Edition):

Gokkus, Enes. “Mist cooling technology for thermoelectric power plants.” 2014. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/39133.

MLA Handbook (7^th Edition):

Gokkus, Enes. “Mist cooling technology for thermoelectric power plants.” 2014. Web. 22 Jan 2021.

Vancouver:

Gokkus E. Mist cooling technology for thermoelectric power plants. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/39133.

Council of Science Editors:

Gokkus E. Mist cooling technology for thermoelectric power plants. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/39133

University of Texas – Austin

2. Duong, Tai Anh. Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine.

Degree: MSin Engineering, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-08-4273

► This research project was about the combined organic Rankine cycle which extracted energy from the exhaust gas of a diesel engine. There was a study… (more)

▼ This research project was about the combined organic Rankine cycle which extracted energy from the exhaust gas of a diesel engine. There was a study about significant properties of suitable working fluids. The chosen working fluid, R134a, was used to operate at the dry condition when it exited the steam piston engine. Furthermore, R134a is environmentally friendly with low environmental impact. It was also compatible with sealing materials. There were calibrations for the components of the combined Rankine cycle. The efficiency of the heat exchanger converting exhaust heat from the diesel engine to vaporize R134a was 89%. The average efficiency of the generator was 50%. The hydraulic pump used for the combined Rankine cycle showed a transporting problem, as vapor-lock occurred when the pump ran for about 1 minute. The output of the combined Rankine cycle was normalized to compensate for the parasitic losses of a virtual vane pump used in hydraulic systems for the 6 liter diesel engines. There were three different vane pump widths from different pumps to compare frictional loss. The pump with the smallest vane width presented the least frictional mean effective pressure (fmep) (0.26 kPa) when scaled with the displacement of the GMC Sierra 6 liter diesel engine. The power output of the Rankine cycle was scaled to brake mean effective pressure (bmep) to compare with the frictional mean effective pressure. The maximum bmep was at 0.071 kPa when diesel engine had rotational speed at 2190 RPM. The power outputs of the organic Rankine compensated partially the frictional loss of the vane pumps in the 6 liter diesel engine. By using R134a, the condensing pressure was 0.8 MPa; hence, the power outputs from steam engine were limited. Therefore, refrigerants with lower condensing pressure were needed. There were proposal for improvement of the organic Rankine by substituting R134a by R123 (0.1 MPa), R21 (0.2 MPa), and R114 (0.25 MPa) . Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew J. (committee member).

Subjects/Keywords: Organic Rankine cycle; Diesel engine; Waste heat recovery; Reciprocal steam engine

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APA (6^th Edition):

Duong, T. A. (2011). Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-08-4273

Chicago Manual of Style (16^th Edition):

Duong, Tai Anh. “Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-08-4273.

MLA Handbook (7^th Edition):

Duong, Tai Anh. “Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine.” 2011. Web. 22 Jan 2021.

Vancouver:

Duong TA. Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4273.

Council of Science Editors:

Duong TA. Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4273

University of Texas – Austin

3. -8656-4098. Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling.

Degree: MSin Engineering, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/64126

► Modern Diesel engines rely heavily on aftertreatment systems for reducing tail pipe emissions. However, for operating conditions such as cold start, extended low load operations… (more)

Subjects/Keywords: Diesel; Exhaust temperature

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APA (6^th Edition):

-8656-4098. (2018). Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/64126

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Chicago Manual of Style (16^th Edition):

-8656-4098. “Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling.” 2018. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/64126.

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Author name may be incomplete

MLA Handbook (7^th Edition):

-8656-4098. “Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling.” 2018. Web. 22 Jan 2021.

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Author name may be incomplete

Vancouver:

-8656-4098. Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling. [Internet] [Masters thesis]. University of Texas – Austin; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/64126.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-8656-4098. Increasing exhaust temperature of an idling light-duty diesel engine through post-injection and intake throttling. [Masters Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/64126

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Author name may be incomplete

University of Texas – Austin

4. Rechen, Ross Michael. Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules.

Degree: MSin Engineering, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-3532

► The goal of this research was to design, build and test a small burner and heat exchanger system that could be used as a source… (more)

▼ The goal of this research was to design, build and test a small burner and heat exchanger system that could be used as a source of heat for thermoelectric modules (TEMs) for the purpose of generating portable electric power for soldiers in the field. The project was conducted as a subcontract to Marlow Industries Inc. which was under contract from the U.S. Army. The scale of the burner thermal output was to be in the approximate range of 2 kW of heat production and it was to be able to operate on a liquid fuel, specifically JP8. The first burner investigated was a custom burner designed and built at UT. It was tested with various fuel and air delivery systems. Different methods to start it, with the goal of developing an electrical starting system, were also investigated. It was capable of operating at outputs over 1 kW, but was difficult to start reliably and fuel vaporization characteristics were sensitive to operating conditions. Two commercial burners were also studied, each with somewhat different designs. One of those burners, manufactured by MSR, was chosen to be further tested in conjunction with a heat exchanger and thermoelectric modules. The performance of the thermoelectric modules used in this study was determined to be very dependent on an attached resistive load, with a peak power output occurring at approximately 3 ohms. Power output was also determined to increase linearly with increasing temperature difference between the hot and cold sides of the module. Power output followed similar trends as open circuit voltage. The temperatures of the heat exchanger across its width were very uniform, but the accuracy in centering the heat exchanger over the burner could significantly affect temperatures. The time to reach steady state temperatures was relatively insensitive to the length of the heat exchanger. The presence of attached thermoelectric modules reduced the temperature of the heat exchangers and exhaust gas slightly. Reducing the heat exchanger length resulted in higher metal temperatures. Without cooling the cold side of the thermoelectric modules, performance increased while the system was heating up, but then dropped after reaching a peak. Cold side cooling improved thermoelectric performance by increasing its temperature difference. Active cooling with a blower and heat sink provided even better performance than passive cooling using just a heat sink at the expense of a larger parasitic load. The TEMs on the 5 inch long heat exchanger could generate 6.32 W with passive cooling, but active cooling would produce no net power. The 11 inch long heat exchanger could generate 12.8 W with passive cooling, and 16 W net could be generated with active cooling. A heat exchanger efficiency calculation showed that the 16, 11 and 5 inch long heat exchangers were about 94.4%, 93.4%, and 90.7% efficient respectively. This efficiency was defined as the ratio of the heat transferred to the heat exchanger to the heat released in the flame. Advisors/Committee Members: Hall, M. J. (Matthew John) (advisor), Matthews, Ronald D. (committee member).

Subjects/Keywords: Burner; Heat exchanger; Thermoelectric modules; Liquid fuels; Thermoelectric generator

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APA (6^th Edition):

Rechen, R. M. (2011). Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-3532

Chicago Manual of Style (16^th Edition):

Rechen, Ross Michael. “Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-3532.

MLA Handbook (7^th Edition):

Rechen, Ross Michael. “Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules.” 2011. Web. 22 Jan 2021.

Vancouver:

Rechen RM. Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3532.

Council of Science Editors:

Rechen RM. Development of a meso-scale liquid-fueled burner for electricity generation through the use of thermoelectric modules. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3532

University of Texas – Austin

5. Osara, Jude Asuelimen. The thermodynamics of degradation.

Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin

URL: http://hdl.handle.net/2152/60459

► Material degradation occurs as a result of irreversible dissipative processes and forces. Various forms of degradation mechanisms exist such as friction, chemical reactions, plasticity, dislocation… (more)

▼ Material degradation occurs as a result of irreversible dissipative processes and forces. Various forms of degradation mechanisms exist such as friction, chemical reactions, plasticity, dislocation movements and corrosion all irreversibly leading to failure of a particular system or component. The first and second laws of thermodynamics describe states of a system from the perspective of energy content and exchanges. The first law prescribes energy conservation while the second law introduces the concept of irreversibility in systems as thermodynamic energies decrease, also known as entropy. It has been shown severally that entropy generation accompanies all degradation mechanisms simply by the irreversible nature of the dissipative processes involved. Hence, predicting and quantifying the effect of these processes based on accurate estimate of entropy produced led to the formulation of the Degradation-Entropy Generation (DEG) Theorem by Michael Bryant, Michael Khonsari and Frederick Ling (2008). The DEG theorem also establishes that if a critical value of degradation measure exists, at which failure occurs, there must also exist critical values of accumulated irreversible entropies, and the relationship between them has also been formulated in an independent study in Russia. A close look at 2 classical theories: Holm’s wear equation, w = kNx/H (subsequently modified to the more commonly used Archard’s equation) and Coulomb friction law, F = μN, shows a direct proportionality between wear and energy dissipated by friction, w ∝ Fx. Application of the DEG theorem to a similar sliding friction between two surfaces and the resulting wear characterized by the accompanying entropy generated (or energy dissipated) is shown to define an equivalent wear coefficient k as the Holm-Archard equation. Currently, this study focuses on further development and validation of the DEG theorem primarily in the area of its application to friction wear, grease degradation, battery ageing and fatigue analysis. A consistent thermodynamic approach for evaluating entropy generation accumulation is proposed. An investigation into the dissipative processes relevant to the degradation mechanisms is carried out for correlation to entropy generation. In addition to mathematical formulations, this work includes theorem verification using empirical fatigue data from previously published studies as well as seminal work - new battery and grease experiments to measure DEG parameters. Advisors/Committee Members: Bryant, Michael David (advisor), Matthews, Ronald D. (advisor), Fahrenthold, Eric (committee member), Khonsari, Michael (committee member), Kyriakedes, Stelios (committee member).

Subjects/Keywords: Thermodynamics; Degradation

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APA (6^th Edition):

Osara, J. A. (2017). The thermodynamics of degradation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/60459

Chicago Manual of Style (16^th Edition):

Osara, Jude Asuelimen. “The thermodynamics of degradation.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/60459.

MLA Handbook (7^th Edition):

Osara, Jude Asuelimen. “The thermodynamics of degradation.” 2017. Web. 22 Jan 2021.

Vancouver:

Osara JA. The thermodynamics of degradation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/60459.

Council of Science Editors:

Osara JA. The thermodynamics of degradation. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/60459

University of Texas – Austin

6. -1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.

Degree: PhD, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/68397

► A research team developed the University of Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on Texas… (more)

▼ A research team developed the University of Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on Texas roads. One of the objectives of the model was to be as flexible as possible in order to be capable of simulating a variety of vehicles, payloads, and traffic conditions. For heavy-duty vehicles, there are no prescribed driving cycles, there are no coastdown coefficients available from the EPA, and we relied on experimental brake specific fuel consumption maps for a few heavy-duty diesel engines. Heavy-duty vehicle drive cycles highly depend upon the vehicle load, the grade of the road, the engine size, and the traffic conditions. In order to capture real driving conditions 54 drive cycles with three different Class 8 trucks, three weight configurations, three traffic congestion levels, and two drivers are collected. Drive cycles obtained in this research include road grade and vehicle speed data with time. Due to the lack of data from EPA for calculating the road load force for heavy-duty vehicles, coastdown tests were performed. To generate generic fuel maps for the fuel economy model, a direct injection quasi-dimensional diesel engine model was developed based on in-cylinder images available in the literature. Sandia National Laboratory researchers obtained various images describing diesel spray evolution, spray mixing, premixed combustion, mixing controlled combustion, soot formation, and NOx formation via imaging technologies. Dec combined all of the available images to develop a conceptual diesel combustion model to describe diesel combustion from the start of injection up to the quasi-steady form of the jet. The end of injection behavior was left undescribed in this conceptual model because no clear image was available due to the chaotic behavior of diesel combustion. A conceptual end-of-injection diesel combustion behavior model was proposed to capture diesel combustion in its life span. A full-cycle quasi-dimensional direct injection diesel engine model was developed that represents the physical models, utilizing the conceptual model developed from imaging experiments and available experiment-based spray models, of the in-cylinder processes. The compression, expansion, and gas exchange stages are modeled via zero-dimensional single zone calculations. A full cycle simulation is necessary in order to capture the initial conditions of the closed section of the cycle and predict the brake specific fuel consumption accurately. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew John (advisor), Ellzey, Janet L. (committee member), Ezekoye, Ofodike A. (committee member), Biros, George (committee member), Roberts, Charles E. (committee member).

Subjects/Keywords: Quasi-dimensional; Diesel; Engine; Heavy-duty; Direct injection; Numerical; Modeling; Combustion; Coastdown; Drive cycle; Fuel economy; Mathematical; Vehicle; Simulation; Class 8

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APA (6^th Edition):

-1322-3556. (2018). Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68397

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Chicago Manual of Style (16^th Edition):

-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/68397.

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MLA Handbook (7^th Edition):

-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Web. 22 Jan 2021.

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Vancouver:

-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/68397.

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Author name may be incomplete

Council of Science Editors:

-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68397

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Author name may be incomplete

7. -2204-2458. Model comparison of prototype diesel rotating liner engine and baseline diesel engine.

Degree: MSin Engineering, Mechanical Engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/47141

► Frictional losses in combustion engines have been the subject of many automotive engineers’ research. Understanding the fundamentals behind each frictional loss helps pave the way… (more)

Subjects/Keywords: Diesel; Prototype engine; Diesel rotating liner engine; Baseline diesel engine; Piston assembly friction; Frictional loss; Cylinder wall

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APA (6^th Edition):

-2204-2458. (2016). Model comparison of prototype diesel rotating liner engine and baseline diesel engine. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/47141

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Chicago Manual of Style (16^th Edition):

-2204-2458. “Model comparison of prototype diesel rotating liner engine and baseline diesel engine.” 2016. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/47141.

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MLA Handbook (7^th Edition):

-2204-2458. “Model comparison of prototype diesel rotating liner engine and baseline diesel engine.” 2016. Web. 22 Jan 2021.

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Vancouver:

-2204-2458. Model comparison of prototype diesel rotating liner engine and baseline diesel engine. [Internet] [Masters thesis]. University of Texas – Austin; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/47141.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2204-2458. Model comparison of prototype diesel rotating liner engine and baseline diesel engine. [Masters Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/47141

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8. Alsulaiman, Yousif Abdulltaif. Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition.

Degree: MSin Engineering, Mechanical Engineering, 2019, University of Texas – Austin

URL: http://dx.doi.org/10.26153/tsw/3434

► Due to their high efficiency and power, the transportation sector relies heavily on diesel engines. However, diesel engines face many challenges regarding their hazardous emissions… (more)

▼ Due to their high efficiency and power, the transportation sector relies heavily on diesel engines. However, diesel engines face many challenges regarding their hazardous emissions and the different regulations for fuel economy which get more stringent over time. One of the main concerns is engine idling where the engine is consuming fuel and emitting pollutants without any utilized power output. In this study, the effects of cylinder deactivation accompanied by throttling and post injection on fuel consumption and emissions were investigated for a 4 cylinder diesel engine at idle conditions. Three different engine operating methods were used. In the 1st method, the engine operated on 4 cylinders, while in the 2nd method; fueling was deactivated for 2 cylinders without valve deactivation. In the last operating method, full cylinder valve deactivation was applied to 2 cylinders. Furthermore, the effects of rail pressure on emissions, IMEP and fuel consumption were investigated. Method 2 with deactivated fueling achieved a minor fuel savings compared to the 4 cylinders operation, between 4-16% depending on the throttling level where more fuel savings were accomplished at higher throttle positions. Method 3 with full cylinder deactivation resulted in 33% fuel savings at WOT compared to Method 1 and 40% at the heaviest throttling level. Pumping losses and fuel consumption were found to increase with throttling, while the net IMEP decreased with heavier throttle conditions. Both CO₂ and hydrocarbons increased with throttling, while NO [subscript x] emissions increased with throttling until 65 kPa of manifold absolute pressure and then started to fall at lower MAP values. These trends correlated with the heat release rate results. Also, fuel consumption and net IMEP increased with a decrease in rail pressure, where the peak heat release rate was more retarded for the lower injection pressure. Finally, the effects of different operating methods and intake throttling on exhaust temperature was analyzed. The temperatures were measured at the exhaust port exits, and for Method 2 prior to any mixing with air from the non-fired cylinders. At wide open throttle (WOT), Method 3 achieved a 20°C increase in exhaust temperature compared to Method 1, and Method 2 resulted in an additional increase of 25°C. Exhaust temperature increased with throttling for all methods, where it rose by 80°C with maximum throttling in Method 1 and 95°C for Methods 2 and 3. Advisors/Committee Members: Hall, M. J. (Matthew John) (advisor), Matthews, Ronald D. (advisor).

Subjects/Keywords: Diesel engine; Cylinder deactivation

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APA (6^th Edition):

Alsulaiman, Y. A. (2019). Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/3434

Chicago Manual of Style (16^th Edition):

Alsulaiman, Yousif Abdulltaif. “Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition.” 2019. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://dx.doi.org/10.26153/tsw/3434.

MLA Handbook (7^th Edition):

Alsulaiman, Yousif Abdulltaif. “Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition.” 2019. Web. 22 Jan 2021.

Vancouver:

Alsulaiman YA. Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2021 Jan 22]. Available from: http://dx.doi.org/10.26153/tsw/3434.

Council of Science Editors:

Alsulaiman YA. Effects of injection pressure, post injection, cylinder deactivation and intake throttling on fuel consumption and emissions for a light duty diesel engine at idle condition. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/3434

9. Vaughn, James Roy. A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy.

Degree: MSin Engineering, Mechanical Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-4980

► The VCOST budgeting tool uses a drive cycle simulator to improve fuel economy predictions for vehicle fleets. This drive cycle simulator needs to predict the… (more)

Subjects/Keywords: Differential; Automotive; Automobile; Final drive; Gear; Windage; Bearing; Seal; VCOST; Fuel economy; Efficiency; Powertrain; Drivetrain; Power train; Drive train; Model; MATLAB; Light-duty; Heavy-duty; Dual differential; Tandem axle; Tag axle; Lubricant; ATF; Automatic transmission fluid; Society of Automotive Engineers; Walther Sutherland; Wheel drive; Transaxle; Thermal/fluid sciences; TFS; TxDOT; Texas Department of Transportation

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APA (6^th Edition):

Vaughn, J. R. (2012). A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-4980

Chicago Manual of Style (16^th Edition):

Vaughn, James Roy. “A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-4980.

MLA Handbook (7^th Edition):

Vaughn, James Roy. “A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy.” 2012. Web. 22 Jan 2021.

Vancouver:

Vaughn JR. A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-4980.

Council of Science Editors:

Vaughn JR. A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-4980

10. Welter, Dana. An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning.

Degree: MSin Engineering, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-3307

► Vehicle operating costs are an invaluable tool to transportation engineers, who utilize them in applications such as cost-benefit analyses and utilization pricing. Many of the… (more)

▼ Vehicle operating costs are an invaluable tool to transportation engineers, who utilize them in applications such as cost-benefit analyses and utilization pricing. Many of the existing models in use, however, are significantly out-of-date with current technology. Research was undertaken in partnership with the Texas Department of Transportation (TxDOT) to develop a new model of the operating costs associated with Texas vehicle fleets. A vehicle operating cost (Vcost) model was produced which estimates variable and fixed costs associated with both light-duty and heavy-duty vehicles. The model calculates both aggregate fleet costs and costs for individual representative vehicles. An analysis of Texas Vehicles, Titles, and Registration (VTR) records; Weigh-in-Motion data; vehicle counts; and national car sales data was used to generate the breakdown of the Texas fleet of vehicles and to determine representative vehicles. Operational costs for these vehicles fell into two main categories: fixed costs (depreciation, financing, insurance, and other) and variable costs (fuel and maintenance/repair). Relations were determined for each cost category for each representative vehicle over its entire operational age. In the case of heavy-duty vehicles, much of the operational costs information is proprietary and had to be gathered in survey work conducted with other members of a research team. A computer program was written that incorporates the cost relations for the representative vehicles as well as the Texas fleet characteristics in such a way that the user can examine the costs of both an individual vehicle and the aggregate costs associated with a fleet of vehicles. The user can also input a default fleet composition. The model allows users to alter key parameters (such as fuel price, financing rates, insurance costs, or vehicle fuel economies) for future adaptability to a changing economic and technological landscape. The model was developed in parallel with another researcher working on an advanced fuel consumption model, which would later be integrated into to the Vcost model. Advisors/Committee Members: Matthews, Ronald D. (advisor), Persad, Khali R. (committee member).

Subjects/Keywords: Vcost; VOC; Transportation engineering; Vehicle operating costs; Transportation planning

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APA (6^th Edition):

Welter, D. (2011). An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-3307

Chicago Manual of Style (16^th Edition):

Welter, Dana. “An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-3307.

MLA Handbook (7^th Edition):

Welter, Dana. “An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning.” 2011. Web. 22 Jan 2021.

Vancouver:

Welter D. An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3307.

Council of Science Editors:

Welter D. An analysis of the Texas vehicle fleet and development of a vehicle operating cost model for use in transportation planning. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3307

11. -2938-2949. Performance improvements of turbocharged engines with the use of a PTP turbo blanket.

Degree: MSin Engineering, Mechanical engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/43718

► Efforts in R&D of modern vehicles are highly focused on improvements of the overall efficiency. The engine still has potential for better performance which not… (more)

▼ Efforts in R&D of modern vehicles are highly focused on improvements of the overall efficiency. The engine still has potential for better performance which not only implies pure efficiency considerations but also the power output specific to the engine size and weight. Turbochargers are a key technology. However, a significant amount of exhaust energy is lost through the turbine housing, and thus cannot be utilized to boost the intake air. If a certain portion of the lost heat can be conserved, however, the process in the turbine can be shifted more towards adiabatic expansion which, in theory, is the ideal case. The Engines Research Program at The University of Texas at Austin conducted comparison tests of a PTP turbo blanket. The baseline engine was a Cummins 6.7 Turbocharged Diesel Engine hooked up to a Superflow SF-901 dynamometer. A series of steady-state points were obtained as well as three instantaneous load tip-in scenarios (hard acceleration transients) in order to test for changes in transient response due to the turbo blanket. In addition to seven thermocouples that we installed around the turbine we used the open ECU software to log a set of about 30 engine parameters. The recorded data was first analysed with respect to the performance of the turbocharger alone. On the steady-state cases, the temperature increase of the turbine housing was significant while we did not measure a major increase of the oil temperature in the exit of the center section. According to these findings, oil “coking” was not a concern since the temperature difference of the oil with and without the turbo blanket was negligibly small. The boost pressure increase corresponded well with the higher turbo shaft speeds when the turbo blanket was applied. Second, tip-in transients were performed to examine the difference in performance during a hard acceleration. The turbo spooled up more rapidly with the turbo blanket installed in comparison to the baseline configuration. In all cases this resulted in an improved boost performance in the intake and a significant time-to-torque advantage of the engine with a torque benefit of up to 140 Nm while the acceleration was improved by 200-250 rpm for most of the tip-in event. This report presents detailed data regarding experiments in which the turbocharger and the engine are treated as an integrated system with a PTP turbo blanket applied in comparison to the baseline configuration for which the turbine housing is not insulated. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew J. (committee member).

Subjects/Keywords: PTP-turbo; PTP; Turbo-blanket; Turbo blanket; Turboblanket; Diesel; Cummins

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APA (6^th Edition):

-2938-2949. (2016). Performance improvements of turbocharged engines with the use of a PTP turbo blanket. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/43718

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2938-2949. “Performance improvements of turbocharged engines with the use of a PTP turbo blanket.” 2016. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/43718.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2938-2949. “Performance improvements of turbocharged engines with the use of a PTP turbo blanket.” 2016. Web. 22 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2938-2949. Performance improvements of turbocharged engines with the use of a PTP turbo blanket. [Internet] [Masters thesis]. University of Texas – Austin; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/43718.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2938-2949. Performance improvements of turbocharged engines with the use of a PTP turbo blanket. [Masters Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/43718

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

12. Anderson, Garrett Lance. Simulation of a parallel hydraulic hybrid refuse truck.

Degree: MSin Engineering, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-12-4681

► A rear loading refuse truck was simulated with a conventional and hydraulic hybrid configuration. Models for the hydraulic hybrid components were developed to simulate the… (more)

Subjects/Keywords: Hydraulic hybrid; Hybrid; Heavy-duty hybrid; Heavy duty vehicle; Fuel economy

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APA (6^th Edition):

Anderson, G. L. (2011). Simulation of a parallel hydraulic hybrid refuse truck. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-12-4681

Chicago Manual of Style (16^th Edition):

Anderson, Garrett Lance. “Simulation of a parallel hydraulic hybrid refuse truck.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-12-4681.

MLA Handbook (7^th Edition):

Anderson, Garrett Lance. “Simulation of a parallel hydraulic hybrid refuse truck.” 2011. Web. 22 Jan 2021.

Vancouver:

Anderson GL. Simulation of a parallel hydraulic hybrid refuse truck. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4681.

Council of Science Editors:

Anderson GL. Simulation of a parallel hydraulic hybrid refuse truck. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4681

University of Texas – Austin

13. Min, Byung-Soon. Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements.

Degree: PhD, Mechanical Engineering., 2004, University of Texas – Austin

URL: http://hdl.handle.net/2152/1277

► A Toyota OPA was selected as a test vehicle as it has the components of interest: a Direct Injection Spark Ignition (DISI) engine and a… (more)

▼ A Toyota OPA was selected as a test vehicle as it has the components of interest: a Direct Injection Spark Ignition (DISI) engine and a Continuously Variable Transmission (CVT). In order to estimate the benefit of the DISI engine and CVT, a 2001MY Toyota OPA was tested to collect the engine and CVT maps using in-situ measurement techniques. Two torque sensors were installed into the powertrain in the vehicle for that purpose; one is between the engine and transmission and the other one is installed on the driveshaft. The overall efficiency of the engine and transmission was estimated using the measured torques and speeds during Phase 3 of the FTP cycle The overall efficiencies of the engine at different operating modes including the lean and stoichiometric combustion modes were compared to each other. The overall efficiencies of the CVT are analyzed similarly. Finally, the measured steady state efficiency maps and emissions maps were used to predict the fuel economy and emissions of an HEV with the DISI engine and CVT. The FTP test for the test vehicle shows that Toyota has made a remarkable improvement of tailpipe HC and NOx emissions with their second generation DISI engine. The reduction of HC emissions is attributed to the improvement in the combustion system using a slit nozzle injector. The dominant factor for NOx reduction turns out to be the catalyst efficiency. Due to the increase in the catalyst capacity, the average catalyst efficiency for NOx is improved from 67.5% to 89.9%. The steady state characteristics of the DISI engine and CVT were collected successfully using the in-situ mapping technique. The operating range of the lean combustion was revealed. The maximum engine load for lean operation was 6 bar BMEP and the maximum engine speed was 2750 rpm. The improvement in steady state fuel consumption is about 20% at low speed and around 3 bar BMEP. The engine-out HC emissions are 2~3 times more and the engine-out NOx emissions are one-half to one-sixth of that in stoichiometric combustion mode. The energy losses were calculated from the measured power flows. The engine, the largest energy sink, consumes 62.3% of total energy loss during power mode and additionally consumes 11.8% more during idling and braking. The CVT consumes 5.6% and the vehicle consumes 20.2%. The overall efficiency of the engine, which is 29.3% during the Hot 505 cycle, is improved to 32.7% with the change in combustion mode to lean combustion. The resulting fuel economy improvement was measured as 5.7%. Therefore, it can be concluded that the fuel economy benefit of the second generation Toyota DISI engine over a PFI engine during Phase 3 of the FTP cycle is 5.7% which is due to the 3.4% improvement in the overall engine efficiency. The benefit of a DISI engine over a conventional SI engine in an HEV application is found to be 4.2% in terms of composite fuel economy and 3.9% for the Hot 505 cycle, which is less than that of 5.7% for a DISI engine in a conventional vehicle. The overall engine… Advisors/Committee Members: Matthews, Ronald D. (advisor).

Subjects/Keywords: Automobiles – Fuel consumption; Hybrid electric cars – Fuel consumption; Automobiles – Motors – Fuel injection systems; Spark ignition engines – Fuel consumption; Automobiles – Transmission devices

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APA (6^th Edition):

Min, B. (2004). Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1277

Chicago Manual of Style (16^th Edition):

Min, Byung-Soon. “Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements.” 2004. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/1277.

MLA Handbook (7^th Edition):

Min, Byung-Soon. “Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements.” 2004. Web. 22 Jan 2021.

Vancouver:

Min B. Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2004. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/1277.

Council of Science Editors:

Min B. Analysis of the fuel economy potential of a direct injection spark ignition engine and a CVT in an HEV and a conventional vehicle based on in-situ measurements. [Doctoral Dissertation]. University of Texas – Austin; 2004. Available from: http://hdl.handle.net/2152/1277

University of Texas – Austin

14. Florette, Claire Anne. Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging.

Degree: MSin Engineering, Mechanical Engineering, 2010, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2010-05-1163

► Quantifying the emissions due to the charging of the batteries of the plug-in hybrid electricity school bus operated by the Austin Independent School District (AISD)… (more)

Subjects/Keywords: Plug-in; Hybrid bus; Emissions; Energy consumptions

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APA (6^th Edition):

Florette, C. A. (2010). Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-05-1163

Chicago Manual of Style (16^th Edition):

Florette, Claire Anne. “Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging.” 2010. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2010-05-1163.

MLA Handbook (7^th Edition):

Florette, Claire Anne. “Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging.” 2010. Web. 22 Jan 2021.

Vancouver:

Florette CA. Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging. [Internet] [Masters thesis]. University of Texas – Austin; 2010. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1163.

Council of Science Editors:

Florette CA. Comparison of emissions and energy consumptions between a conventional diesel school bus and a plug-in hybrid school bus, emphasizes on recharging. [Masters Thesis]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1163

University of Texas – Austin

15. Seers, Patrice. Spark ignition: an experimental and numerical investigation.

Degree: PhD, Mechanical Engineering., 2003, University of Texas – Austin

URL: http://hdl.handle.net/2152/940

► The four phases of a spark ignition discharge are reviewed with respect to the physics and chemistry involved. An equation based on the energy exchange… (more)

Subjects/Keywords: Spark ignition engines

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APA (6^th Edition):

Seers, P. (2003). Spark ignition: an experimental and numerical investigation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/940

Chicago Manual of Style (16^th Edition):

Seers, Patrice. “Spark ignition: an experimental and numerical investigation.” 2003. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/940.

MLA Handbook (7^th Edition):

Seers, Patrice. “Spark ignition: an experimental and numerical investigation.” 2003. Web. 22 Jan 2021.

Vancouver:

Seers P. Spark ignition: an experimental and numerical investigation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2003. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/940.

Council of Science Editors:

Seers P. Spark ignition: an experimental and numerical investigation. [Doctoral Dissertation]. University of Texas – Austin; 2003. Available from: http://hdl.handle.net/2152/940

University of Texas – Austin

16. Kim, Myoungjin. Friction force measurement and analysis of the rotating liner engine.

Degree: PhD, Mechanical Engineering., 2005, University of Texas – Austin

URL: http://hdl.handle.net/2152/1954

► As emissions regulations become more stringent and fuel prices increase at a significant rate, the fuel efficiency of piston engines becomes more important than ever.… (more)

Subjects/Keywords: Friction; Pistons; Internal combustion engines

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APA (6^th Edition):

Kim, M. (2005). Friction force measurement and analysis of the rotating liner engine. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1954

Chicago Manual of Style (16^th Edition):

Kim, Myoungjin. “Friction force measurement and analysis of the rotating liner engine.” 2005. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/1954.

MLA Handbook (7^th Edition):

Kim, Myoungjin. “Friction force measurement and analysis of the rotating liner engine.” 2005. Web. 22 Jan 2021.

Vancouver:

Kim M. Friction force measurement and analysis of the rotating liner engine. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2005. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/1954.

Council of Science Editors:

Kim M. Friction force measurement and analysis of the rotating liner engine. [Doctoral Dissertation]. University of Texas – Austin; 2005. Available from: http://hdl.handle.net/2152/1954

17. Munguia, Nicole. Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel.

Degree: MSin Engineering - MSE, Mechanical Engineering, 2009, University of Texas – Austin

URL: http://hdl.handle.net/2152/40937

► Various diesel NOx control technologies are being explored today as solutions for minimizing NOx emissions. The Lean NOx Trap is one of two products that… (more)

Subjects/Keywords: Lean NOx trap; LNT; Diesel-hybrid; Regeneration; NOx; Diesel emissions

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APA (6^th Edition):

Munguia, N. (2009). Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/40937

Chicago Manual of Style (16^th Edition):

Munguia, Nicole. “Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel.” 2009. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/40937.

MLA Handbook (7^th Edition):

Munguia, Nicole. “Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel.” 2009. Web. 22 Jan 2021.

Vancouver:

Munguia N. Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel. [Internet] [Masters thesis]. University of Texas – Austin; 2009. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/40937.

Council of Science Editors:

Munguia N. Lean NOx trap regeneration control strategy on a 1.9L turbocharged diesel. [Masters Thesis]. University of Texas – Austin; 2009. Available from: http://hdl.handle.net/2152/40937

18. Sung, Yonduck. Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames.

Degree: PhD, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-12-4465

► Flame based synthesis is a major manufacturing process of commercially valuable nanoparticles for large-scale production. However, this important industrial process has been advanced mostly by… (more)

▼ Flame based synthesis is a major manufacturing process of commercially valuable nanoparticles for large-scale production. However, this important industrial process has been advanced mostly by trial-and-error based evolutionary studies owing to the fact that it involves tightly coupled multiphysics flow phenomena. For large scale synthesis of nanoparticles, different physical and chemical processes exist, including turbulence, fuel combustion, precursor oxidation, and nanoparticle dynamics exist. A reliable and predictive computational model based on fundamental physics and chemistry can provide tremendous insight. Development of such comprehensive computational models faces challenges as they must provide accurate descriptions not only of the individual physical processes but also of the strongly coupled, nonlinear interactions among them. In this work, a multiscale computational model for flame synthesis of TiO2 nanoparticles in a turbulent flame reactor is presented. The model is based on the large-eddy simulation (LES) methodology and incorporates detailed gas phase combustion and precursor oxidation chemistry as well as a comprehensive nanoparticle evolution model. A flamelet-based model is used to model turbulence-chemistry interactions. In particular, the transformation of TiCl4 to the solid primary nucleating TiO2 nanoparticles is represented us- ing an unsteady kinetic model considering 30 species and 70 reactions in order to accurately describe the critical nanoparticle nucleation process. The evolution of the TiO2 number density function is tracked using the quadrature method of moments (QMOM) for univariate particle number density function and conditional quadrature method of moments (CQMOM) for bivariate density distribution function. For validation purposes, the detailed computational model is compared against experimental data obtained from a canonical flame- based titania synthesis configuration, and reasonable agreement is obtained. Advisors/Committee Members: Moser, Robert deLancey (advisor), Raman, Venkat (advisor), Ezekoye, Ofodike A. (committee member), Matthews, Ronald D. (committee member), Clemens, Noel T. (committee member).

Subjects/Keywords: Large eddy simulation; TiO2 nanoparticle; Detailed TiCl4 oxidation chemistry; Quadrature method of moments; Moment correction

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APA (6^th Edition):

Sung, Y. (2011). Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-12-4465

Chicago Manual of Style (16^th Edition):

Sung, Yonduck. “Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-12-4465.

MLA Handbook (7^th Edition):

Sung, Yonduck. “Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames.” 2011. Web. 22 Jan 2021.

Vancouver:

Sung Y. Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4465.

Council of Science Editors:

Sung Y. Large eddy simulation of TiO₂ nanoparticle evolution in turbulent flames. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4465

19. Byun, Jung Joo. Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.

Degree: PhD, Mechanical Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-516

► Iso-octane, n-heptane, ethanol and their blends were tested in a constant volume combustion chamber to measure laminar burning velocities. The experimental apparatus was modified from… (more)

Subjects/Keywords: Laminar flame speed; Laminar burning velocity; Fuel blends; Iso-octane; n-heptane; Ethanol

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APA (6^th Edition):

Byun, J. J. (2011). Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-516

Chicago Manual of Style (16^th Edition):

Byun, Jung Joo. “Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-516.

MLA Handbook (7^th Edition):

Byun, Jung Joo. “Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.” 2011. Web. 22 Jan 2021.

Vancouver:

Byun JJ. Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-516.

Council of Science Editors:

Byun JJ. Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-516

20. Baker, Chad Allan. Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust.

Degree: PhD, Mechanical Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-12-296

► An analytical transport/reaction model was developed to simulate the catalytic performance of ZnO nanowires as a catalyst support. ZnO nanowires were chosen because they have… (more)

▼ An analytical transport/reaction model was developed to simulate the catalytic performance of ZnO nanowires as a catalyst support. ZnO nanowires were chosen because they have easily characterized, controllable features and a spatially uniform morphology. The analytical model couples convection in the catalyst flow channel with reaction and diffusion in the porous substrate material; it was developed to show that a simple analytical model with physics-based mass transport and empirical kinetics can be used to capture the essential physics involved in catalytic conversion of hydrocarbons. The model was effective at predicting species conversion efficiency over a range of temperature and flow rate. The model clarifies the relationship between advection, bulk diffusion, pore diffusion, and kinetics. The model was used to optimize the geometry of the experimental catalyst for which it predicted that maximum species conversion density for fixed catalyst surface occurred at a channel height of 520 [mu]m. A modeling study of thermoelectric (TE) vehicle waste heat recovery was conducted based on abundant and inexpensive Mg₂ Si[subscript 0.5] Sn[subscript 0.5] and MnSi[subscript 1.75] TE materials with consideration of performance at the system and TE device levels. The modeling study identified a critical TE design space of fill fraction, leg length, n-/p-type leg area ratio, and current; these parameters needed to be optimized simultaneously for positive TE power output. The TE power output was sensitive to this design space, and the optimal design point was sensitive to engine operating conditions. The maximum net TE power for a 29.5 L strip fin heat exchanger with an 800 K exhaust flow at 7.9 kg/min was 2.25 kW. This work also includes two generations of TE waste heat recovery systems that were built and tested in the exhaust system of a Cummins 6.7 L turbo Diesel engine. The first generation was a small scale heat exchanger intended for concept validation, and the second generation was a full scale heat exchanger that used the entire exhaust flow at high speed and torque. The second generation heat exchanger showed that the model could accurately predict heat transfer, and the maximum experimental heat transfer rate was 15.3 kW for exhaust flow at 7.0 kg/min and 740 K. Advisors/Committee Members: Shi, Li, Ph. D. (advisor), Hall, M. J. (Matthew John) (advisor), Matthews, Ronald D. (committee member), Ezekoye, Ofodike A. (committee member), Raja, Laxminarayan L. (committee member).

Subjects/Keywords: Thermoelectric; Automotive; Catalyst; Waste heat recovery; Analytical model; Heat exchanger

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APA (6^th Edition):

Baker, C. A. (2012). Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-12-296

Chicago Manual of Style (16^th Edition):

Baker, Chad Allan. “Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2012-12-296.

MLA Handbook (7^th Edition):

Baker, Chad Allan. “Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust.” 2012. Web. 22 Jan 2021.

Vancouver:

Baker CA. Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-296.

Council of Science Editors:

Baker CA. Simulation, design, and experimental characterization of catalytic and thermoelectric systems for removing emissions and recovering waste energy from engine exhaust. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-296

University of Texas – Austin

21. Xu, Huijie. Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines.

Degree: PhD, Mechanical Engineering., 2005, University of Texas – Austin

URL: http://hdl.handle.net/2152/2371

► The influence of piston assembly lubrication on the reciprocating internal combustion engine performance has received considerable attention for over halfcentury. An in-depth understanding of piston… (more)

▼ The influence of piston assembly lubrication on the reciprocating internal combustion engine performance has received considerable attention for over halfcentury. An in-depth understanding of piston assembly friction and cylinder wear is crucial for achieving a better fuel economy and higher durability engine design. Early studies show hydrodynamic lubrication theory is applicable to the interface of piston assembly and cylinder liner throughout most of the piston middle stroke. However, when the piston motion ceases near top dead center (TDC) or bottom dead center (BDC) of the stroke, the piston velocity is not adequate to establish a hydrodynamic lubrication action. Lubricating films become very thin and contact between the surface asperities on the ring and the liner will support part of the piston ring restoring force. Therefore, wear on the cylinder liner surface may occur in the vicinity of TDC and BDC. Severe surface wear could affect the liner-ring sealing performance and result in excessive gas blow-by and fuel consumption. The objective of this dissertation is to develop a complete mathematical and computational model to predict the piston assembly friction loss in terms of the piston assembly design parameters and cylinder liner surface topography. Piston assembly experiences all three lubrication regimes including hydrodynamic, mixed and boundary lubrication. In order to simplify modeling, early studies usually considered either a full film hydrodynamic lubrication described by Reynolds equation, or a mixed film lubrication described by average Reynolds equation. While our model is based on the real surface interactive between piston assembly and cylinder liner, the latest tribology theory and effective numerical approach have been applied to model piston assembly friction problem. An integrated friction model over three lubrication regimes was developed based on both quasi-static and dynamic equilibrium conditions of the piston assembly. The new model was verified by experimental data with specified pressure and velocity boundaries. Finally, the friction characteristics of a rotating liner engine (RLE) design was investigated as an extension of the conventional piston assembly friction model. Advisors/Committee Members: Bryant, Michael D. (advisor), Matthews, Ronald D. (advisor).

Subjects/Keywords: Piston rings – Simulation methods; Lubrication systems – Simulation methods; Internal combustion engines

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xu, H. (2005). Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/2371

Chicago Manual of Style (16^th Edition):

Xu, Huijie. “Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines.” 2005. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/2371.

MLA Handbook (7^th Edition):

Xu, Huijie. “Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines.” 2005. Web. 22 Jan 2021.

Vancouver:

Xu H. Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2005. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/2371.

Council of Science Editors:

Xu H. Predictive modeling of piston assembly lubrication in reciprocating internal combustion engines. [Doctoral Dissertation]. University of Texas – Austin; 2005. Available from: http://hdl.handle.net/2152/2371

University of Texas – Austin

22. Ates, Murat, 1982-. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.

Degree: MSin Engineering, Mechanical Engineering, 2009, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2009-05-80

► Development of a fuel economy model for light-duty and heavy-duty vehicles is part of the Texas Department of Transportation’s “Estimating Texas Motor Vehicle Operating Costs”… (more)

▼ Development of a fuel economy model for light-duty and heavy-duty vehicles is part of the Texas Department of Transportation’s “Estimating Texas Motor Vehicle Operating Costs” project. A literature review for models that could be used to predict the fuel economy of light-duty and heavy-duty vehicles resulted in selection of coastdown coefficients to simulate the combined effects of aerodynamic drag and tire rolling resistance. For light-duty vehicles, advantage can be taken of the modeling data provided by the United States Environmental Protection Agency (EPA) for adjusting chassis dynamometers to allow accurate determination of emissions and fuel economy so that compliance with emissions standards and Corporate Average Fuel Economy (CAFE) regulations can be assessed. Initially, EPA provided vehicle-specific data that were relevant to a physics-based model of the forces at the tire-road interface. Due to some limitations of these model parameters, EPA now provides three vehicle-specific coefficients obtained from vehicle coastdown data. These coefficients can be related back to the original physics-based model of the forces at the tire-road interface, but not in a manner that allows the original modeling parameters to be extracted from the coastdown coefficients. Nevertheless, as long as the operation of a light-duty vehicle does not involve extreme acceleration or deceleration transients, the coefficients available from the EPA can be used to accurately predict fuel economy. Manufacturers of heavy-duty vehicles are not required to meet any sort of CAFE standards, and the engines used in heavy-duty vehicles, rather than the vehicles themselves, are tested (using an engine dynamometer) to determine compliance with emissions standards. Therefore, EPA provides no data that could be useful for predicting the fuel economy of heavy-duty vehicles. Therefore, it is necessary to perform heavyduty coastdown tests in order to predict fuel economy, and use these tests to develop vehicle-specific coefficients for the force at the tire-road interface. Given these coefficients, the fuel economy of a heavy-duty vehicle can be calculated for any driving schedule. The heavy-duty vehicle model developed for this project is limited to pre-2007 calendar year heavy-duty vehicles due to the adverse effects of emissions components that were necessary to comply with emissions standards that went into effect January 2007. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew J. (committee member).

Subjects/Keywords: Fuel Economy; Fuel Economy Modeling; Light-Duty; Heavy-Duty; Automotive; Vehicle; Coastdown; Coast-down; AVL ADVISOR; AVL CRUISE; AVL BOOST

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ates, Murat, 1. (2009). Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2009-05-80

Chicago Manual of Style (16^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Masters Thesis, University of Texas – Austin. Accessed January 22, 2021. http://hdl.handle.net/2152/ETD-UT-2009-05-80.

MLA Handbook (7^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Web. 22 Jan 2021.

Vancouver:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Internet] [Masters thesis]. University of Texas – Austin; 2009. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80.

Council of Science Editors:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Masters Thesis]. University of Texas – Austin; 2009. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80

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