Numerical investigation of shock-turbulent mixing layer interaction and shock-associated noise

Direct numerical simulation of shock-turbulent mixing layer interaction (STMLI) is conducted in this paper to study the influence (STI) on turbulence evolution and shock-associated noise. The results show that turbulent kinetic energy pressure fluctuation around point STI are both first increased then reduced a smaller value than fully developed region layer, while Reynolds-stress anisotropy at upper edge STMLI changed under compression–expansion effect induced by distorted shock tip reflected expansion wave. Additionally, it found noise would increase overall sound level (OASPL) amplify high-frequency upstream observers. By applying shock-leakage theory, scale analysis, spectrum two generation mechanisms identified: first, wave unsteady movement, which generates with cylindrical front; second, decreases increases band so as strengthen small-scale radiate out more Finally, strength explored, reduction observed when decreasing strength. converting OASPL difference equivalent acoustic difference, linear correlation between source found.