Compressibility effects on turbulence evolution and scalar mixing in high-speed, reacting shear flows: a DNS study.

Department of Mechanical and Aerospace Engineering
University of California, San Diego

Abstract-
In technological applications such as high-speed propulsion and energetic devices, the variation in thermodynamic variables associated with large heat release and/or high speeds interacts with and modifies the underlying turbulent flow. Direct numerical simulations of the reacting shear layer are performed over a wide range of heat release rates and convective Mach numbers to quantify and understand some of these modifications to the turbulence evolution and structure. Simulations are performed with up to 20 million grid points, high-order discretization, and with large evolution times required to achieve full-blown turbulence. The mixing rates and turbulence structure are found to be substantially different with respect to the incompressible case. DNS results and supporting analysis will be presented to explain the observed compressibility effects.

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