The effects of repetitive laser energy depositions on a supersonic intake under different operating conditions, especially in the subcritical and buzz modes, were experimentally investigated using a supersonic intake model with a central conical compression surface and square cross-sectional duct. Weak pulsation mode instability was observed in the subcritical mode; strong instability due to resonant oscillation appeared in the buzz mode. By a single pulse energy deposition, flow separation at the compression surface was suppressed by interaction with a shock wave and a thermal bubble generated by the energy deposition. By repetitively depositing laser pulse energies, both instabilities were moderated with the pressure recovery being increased; the occurrence of buzz was delayed, thereby widening the stable, subcritical regime.
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