Subharmonic secondary instability of compressible boundary layer on flat plate with suctions

摘要

The secondary subharmonic instability of compressible boundary layer on a flat plate with wall suction is investigated. It is found that the subharmonic parametric resonance may be an intrinsic mechanism of compressible boundary layer. The wall suction always stabilizes the secondary subharmonic disturbance in subsonic, supersonic and hypersonic boundary layers. Wall suction delays the onset of the secondary instability, reduces the amplification factors and thus controls the process of transition to turbulence.