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You searched for +publisher:"University of Notre Dame" +contributor:("Hyungrok Do, Committee Chair"). Showing records 1 – 2 of 2 total matches.

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University of Notre Dame

1. Brendan Joseph McGann. Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>.

Degree: MSAeroE, Aerospace and Mechanical Engineering, 2015, University of Notre Dame

Laser induced breakdown spectroscopy (LIBS) is used to simultaneously measure hydrocarbon fuel concentration and temperature in high temperature, high speed, compressible, and reacting flows, a regime in which LIBS has not been done previously. Emission spectra from the plasma produced from a focused laser pulse is correlated in the combustion region of a model scramjet operating in supersonic wind tunnel. A 532 nm Nd:YAG laser operating at 10 Hz is used to induce breakdown. The emissions are captured during a 10 ns gate time approximately 75 ns after the first arrival of photons at the measurement location in order to minimize the measurement uncertainty in the turbulent, compressible, high-speed, and reacting environment. Three methods of emission detection are used and a new backward scattering direction method is developed that is beneficial in reducing the amount of optical access needed to perform LIBS measurements. Measurements are taken in the model supersonic combustion and the ignition process is shown to be highly dependent on fuel concentration and gas density as well as combustion surface temperature, concentration gradient, and flow field. Direct spectrum matching method is developed and used for quantitative measurements. In addition, a comprehensive database of spectra covering the fuel concentrations and gas densities found in the wind tunnel of Research Cell 19 at Wright Patterson Air Force Base is created which can be used for further work. Advisors/Committee Members: Flint Thomas, Committee Member, Scott Morris, Committee Member, Hyungrok Do, Committee Chair.

Subjects/Keywords: Laser Diagnostics; Combustion; LIBS; Reacting Flows

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

APA (6th Edition):

McGann, B. J. (2015). Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/4f16c24991v

Chicago Manual of Style (16th Edition):

McGann, Brendan Joseph. “Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>.” 2015. Masters Thesis, University of Notre Dame. Accessed November 16, 2019. https://curate.nd.edu/show/4f16c24991v.

MLA Handbook (7th Edition):

McGann, Brendan Joseph. “Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>.” 2015. Web. 16 Nov 2019.

Vancouver:

McGann BJ. Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>. [Internet] [Masters thesis]. University of Notre Dame; 2015. [cited 2019 Nov 16]. Available from: https://curate.nd.edu/show/4f16c24991v.

Council of Science Editors:

McGann BJ. Simultaneous Species Concentration and Temperature Measurements Using Laser Induced Breakdown Spectroscopy with Direct Spectrum Matching</h1>. [Masters Thesis]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/4f16c24991v


University of Notre Dame

2. Qili Liu. Turbulent Combustion in High Mach Number Flows</h1>.

Degree: PhD, Aerospace and Mechanical Engineering, 2015, University of Notre Dame

The primary goals of this study are to investigate turbulent combustion dynamics in high Mach number flows and to understand the influence of turbulence on the high-speed combustion phenomena. To conduct this unprecedented experimental investigation, an arc-heated hypersonic wind tunnel facility with 1-second test time is used for generating high Mach number (Mach 4.5, 6 and 9) and high-enthalpy flows of total temperature up to 3,500 K. An integrated model scramjet is installed in the test section of the hypersonic tunnel for experimental investigations in well-defined flows. The freestream turbulence is manipulated using various combinations of meshes and a turbulence damper (a component enforcing slow flow expansion and rapid contraction). It is well known that fine meshes can break large-scale flow structures into small-scale structures to facilitate turbulence dissipation. In addition, the contraction component (turbulence damper) is designed to accelerate gas mixtures toward sonic point at the C/D nozzle throat while dampening the streamwise velocity fluctuations. The turbulence levels in flows are measured qualitatively and quantitatively using Rayleigh scattering and Pitot probe, respectively. Flow field visualizations in a model scramjet are conducted in room temperature flows at different turbulence levels using CO2-seeded Rayleigh scattering method. The three-dimensional flow structures are acquired by scanning the two-dimensional laser sheet for Rayleigh scattering over the entire scramjet flow volume. Flow structures visualized using this novel technique depict that the jet-induced secondary flows significantly affect the subsequent flow structures. In addition, it is obvious that the increased turbulence level in freestream triggers earlier boundary layer transition and separation. Although these investigations on the 3D flow structures in the model scramjet are conducted in low-enthalpy flows, numerous important insights on the rather generic flow behaviors that will appear also in high-enthalpy flows are provided with various turbulent levels and inlet geometries. Planar laser induced fluorescence (PLIF) method is used as the most important tool for investigating the turbulent flame in supersonic flows. Ethylene (C2H4) is directly injected into the model scramjet under various freestream turbulence conditions. The effects of the freestream turbulence, inlet geometries, and other flow properties including total pressure/temperature are studied. Advisors/Committee Members: Flint O. Thomas, Committee Member, Hyungrok Do, Committee Chair, Scott C. Morris, Committee Member, Joseph M. Powers, Committee Member.

Subjects/Keywords: scramjet; hypersonic flows; flow visualization; ethylene flame; turbulence control; combustion diagnostics

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

APA (6th Edition):

Liu, Q. (2015). Turbulent Combustion in High Mach Number Flows</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/zc77sn02w60

Chicago Manual of Style (16th Edition):

Liu, Qili. “Turbulent Combustion in High Mach Number Flows</h1>.” 2015. Doctoral Dissertation, University of Notre Dame. Accessed November 16, 2019. https://curate.nd.edu/show/zc77sn02w60.

MLA Handbook (7th Edition):

Liu, Qili. “Turbulent Combustion in High Mach Number Flows</h1>.” 2015. Web. 16 Nov 2019.

Vancouver:

Liu Q. Turbulent Combustion in High Mach Number Flows</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2015. [cited 2019 Nov 16]. Available from: https://curate.nd.edu/show/zc77sn02w60.

Council of Science Editors:

Liu Q. Turbulent Combustion in High Mach Number Flows</h1>. [Doctoral Dissertation]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/zc77sn02w60

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