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Thesis/Dissertation Seminars

Thesis Defense: Compressible Flame Dynamics of Highly-Turbulent Standing Flames

ENG II 202
March 19, 2018 @ 12:00 PM - 02:00 PM

Announcing the Final Examination of Jonathan Sosa for the degree of Master of Science

This study investigated the measurement of turbulent burning velocities of a highly-turbulent compressible standing flame induced by shock-driven turbulence in a Turbulent Shock Tube. High-speed schlieren, chemiluminescence, PIV, and dynamic pressure measurements are made to quantify flame-turbulence interaction for high levels of turbulence at elevated temperatures and pressure.

Distributions of turbulent velocities, vorticity and turbulent strain are provided for regions ahead and behind the standing flame. The turbulent flame speed is directly measured for the high-Mach standing turbulent flame. From measurements of the flame turbulent speed and turbulent Mach number, transition into a non-linear compressibility regime at turbulent Mach numbers above 0.4 is confirmed, and a possible mechanism for flame generated turbulence and deflagration-to-detonation transition is established.

Future work will further investigate the local ignition and higher speed regimes of non-linear compressibility leading to the onset of the deflagration-to-detonation transition.

Committee in Charge: Kareem Ahmed (Chair), Jayanta Kapat, Alain Kassab