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You searched for +publisher:"Clemson University" +contributor:("Dr. Richard Miller, Committee Chair"). Showing records 1 – 2 of 2 total matches.

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Clemson University

1. Wright, James Ray, III. Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow.

Degree: MS, Mechanical Engineering, 2020, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/3363 

Conical diffusers are used in hundreds of engineering applications in various industries. Some of the operating conditions that they operate under cause swirling flow to enter the diffuser. It is generally well documented that the addition of swirl to the flow of a diffuser allows for greater divergence angles without wall separation, resulting in better overall performance of the diffuser and the machine it’s attached to. It is also known that as swirl strength is increased, the flow will eventually breakdown, resulting in internal flow recirculation and decreased diffuser performance. However, the relationship between the diffuser geometry and its performance at these higher swirl strengths has not been investigated in detail. This link between diffuser geometry, swirl, and performance is investigated using a hybrid RANS-LES based computational model. A series of simulations are performed with the computational model, varying the swirl strength and diffuser half angle φ. Overall, there was found to be little relationship between adjusting the diffuser geometry and diffuser performance at high swirl numbers. Advisors/Committee Members: Dr. Richard Miller, Committee Chair, Dr. Ethan Kung, Dr. Xiangchun Xuan.

Subjects/Keywords: Mechanical Engineering

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

APA (6th Edition):

Wright, James Ray, I. (2020). Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3363

Chicago Manual of Style (16th Edition):

Wright, James Ray, III. “Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow.” 2020. Masters Thesis, Clemson University. Accessed January 17, 2021. https://tigerprints.clemson.edu/all_theses/3363.

MLA Handbook (7th Edition):

Wright, James Ray, III. “Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow.” 2020. Web. 17 Jan 2021.

Vancouver:

Wright, James Ray I. Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow. [Internet] [Masters thesis]. Clemson University; 2020. [cited 2021 Jan 17]. Available from: https://tigerprints.clemson.edu/all_theses/3363.

Council of Science Editors:

Wright, James Ray I. Static Pressure Recovery Effects of Conical Diffusers with Swirling Inlet Flow. [Masters Thesis]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_theses/3363


Clemson University

2. Quinones, Matthew. Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers.

Degree: MS, Mechanical Engineering, 2018, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/3010 

Various types of air breathing engines are used as propulsion devices in aviation. At high flight velocities, the use of a ramjet or supersonic combustion ramjet (scramjet) may be preferred due to the natural compressibility of air at high speed. A scramjet, while similar to the ramjet, does not slow air to subsonic speeds prior to combustion, allowing it to operate at much higher flight velocities at very high altitude. For this reason, however, the residence time of air inside of the combustor is on the order of milliseconds, requiring rapid mixing and ignition of the fuel to generate adequate thrust. To do this, a flameholder is often used, which generates turbulence, shock waves, and maintains a recirculation region through geometric effects. In this study, four geometry types involving eighteen separate designs were chosen and analyzed using CFD software. Isolator inlet Mach numbers of 2.2, 4, 6, 8, and 10 were selected to model varying flight velocity, and hydrogen fuel was injected sonically at all injector locations with a single step reaction mechanism applied for combustion. An existing square cavity model was chosen and modified to produce slanted cavity, double cavity, and combined strut-cavity designs. The flameholders were analyzed in a non-reacting simulation to observe their effects on the flow field and fuel mixing efficiency. Reacting simulations were performed for each flameholder to investigate flame stabilization capabilities, thermal choking, stagnation pressure losses and drag generated inside of the combustor. Results show that all designs sustain a flame during combustion at all flight Mach numbers. However, the square cavity with a back cavity injector does this while limiting losses and drag due to shock wave formation, thermal choking, and geometric effects in the flow. Advisors/Committee Members: Dr. Richard Miller, Committee Chair, Dr. John Saylor, Dr. Xiangchun Xuan.

Subjects/Keywords: Flame holder; Flame stability; Ramjet; Scramjet

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

APA (6th Edition):

Quinones, M. (2018). Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3010

Chicago Manual of Style (16th Edition):

Quinones, Matthew. “Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers.” 2018. Masters Thesis, Clemson University. Accessed January 17, 2021. https://tigerprints.clemson.edu/all_theses/3010.

MLA Handbook (7th Edition):

Quinones, Matthew. “Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers.” 2018. Web. 17 Jan 2021.

Vancouver:

Quinones M. Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2021 Jan 17]. Available from: https://tigerprints.clemson.edu/all_theses/3010.

Council of Science Editors:

Quinones M. Numerical Analysis of Scramjet Cavity Flameholders at Varying Flight Mach Numbers. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/3010

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