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Direct numerical simulations of three-dimensional compressible mixing layers with non-premixed hydrogen–air combustion were performed using a detailed chemical reaction mechanism withproduction. Flow fields with three types of initial disturbances were simulated to investigate the relationship between developing vortical structures andformation. The amounts ofandproduced in the simple shear layer were smaller than those in the two- and three-dimensional mixing layers with vortical structures. In the mixing layers, the formation and expansion of the combustion region by the roller vortices and the baroclinic torque had a significant impact onproduction, while the relatively low-temperature combustion region formed by the three-dimensional developed rib vortices in the blade regions between the roller vortices had a large effect on theproduction. It was found that a two-dimensional simulation can estimate theproduction, while the information on a three-dimensional mixing layer is necessary to predict theproduction.

DNS predictions of NO x production in developing turbulent mixing layers with non-premixed hydrogen–air combustion