Abstract
Effects of the heat release and the fluid shear on the nonpremixed reaction processes are studied by applying a three-dimensional large eddy simulation (LES) to a compressible, spatially developing nonpremixed reacting plane mixing layer. The fluid shear is generated by the streamwise and spanwise inlet velocity differences between the fuel and oxidizer. SGS turbulence and combustion models used are the dynamic Smagorinsky model (DSM) and the scale similarity filtered reaction rate model (SSFRRM), respectively. The results show that the heat release and the spanwise fluid shear promote the mixing between the fuel and oxidizer and increase the production. Although Reynolds stress and fuel flux are usually positive in the isothermal mixing layer except, for the region near the inlet, these values become negative in certain regions away from the inlet due to the heat release and the spanwise fluid shear.
