Compressible turbulent flame speeds of highly turbulent standing flames |
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| Authors: | Jonathan Sosa Jessica Chambers Kareem A. Ahmed Alexei Poludnenko Vadim N. Gamezo |
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| Affiliation: | 1. Center for Advanced Turbomachinery & Energy Research, Department of Mechanical and Aerospace Engineering, University of Central Florida, 12760 Pegasus Blvd, P.O. Box 162450, Orlando, FL 32816-2450, USA;2. Department of Aerospace Engineering, Mechanical & Aerospace Engineering, Texas A&M University, College Station, TX, USA;3. Laboratories for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington DC, USA |
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| Abstract: | In this paper we present the first 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. |
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| Keywords: | Compressible turbulent flames Turbulent flame speed Flame–turbulence interactions Flame structural dynamics Turbulent standing flame |
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