ABSTRACT
Direct numerical simulations of three-dimensional compressible mixing layers with non-premixed hydrogen–air combustion were performed using a detailed chemical reaction mechanism with production. Flow fields with three types of initial disturbances were simulated to investigate the relationship between developing vortical structures and
formation. The amounts of
and
produced 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 on
production, 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 the
production. It was found that a two-dimensional simulation can estimate the
production, while the information on a three-dimensional mixing layer is necessary to predict the
production.
Acknowledgements
This research was performed using the supercomputer of the Academic Centre for Computing and Media Studies, Kyoto University.
Disclosure statement
The authors report there are no competing interests to declare.