Influence of compressibility effect on supersonic combustion modeling

Large eddy simulation is applied to study the compressibility effect on supersonic combustion modeling, through adding compressibility corrections into the original model, including reaction rate correction (RRC), and subgrid stress correction (SSC). Two correction results and the result without compressibility effect correction (WCEC) are compared with the experimental results, including the fields of velocity, composition, and temperature and the lift-off height of flame. The results show that the effect of two compressibility correction models on the lift-off height of flame can be ignored, whereas the width of time-averaged velocity field, the peak value of the composition field, and the reaction zone length of time-averaged temperature can be affected by the two compressibility correction models. And the more obvious differences can be foud in the instantaneous fields of velocity and tempetature. A probe is located at (X/D=32.3, Y/D=0, Z/D=1.1) to measure the instantaneous temperature of three cases (WCEC, RRC, SSC). The results reveal that the combustion field has a periodic characteristic, and the SSC has an effect on it. © 2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved