Through combining an experimental study with numerical simulation

an analysis of mixing characteristics of a supersonic mixing layer was carried out

which was influenced by forced vibration under the condition of convective Mach number 0.22. The indexes of momentum mixing

Reynolds stress and scalar mixing were adopted to assess the mixing efficiency of supersonic mixing layer. The results show that forced vibration has an important effect on the mixing efficiency. Compared with no vibration

forced vibration advances the instability position of mixing layer and enlarges the scales of rolled-up spanwise vortices

which can promote the mixing of upper and lower streams. Meanwhile

with forced vibration

both momentum and scalar are more fully mixed. The peak value of Reynolds stress increases by about 48% when the vibration frequency is 4500Hz and the momentum thickness increases by 120% at 160mm position downstream the trailing edge of thin metal plate.