An experimental study was conducted to investigate the restart performance of a fixed-geometry

mixed-compression

two-dimensional supersonic inlet under unstart condition due to raising backpressure

with a designed flight Mach number from 2.25 to 4.0.The test results and two-dimensional unsteady simulation results show that

the inlet performance is consistent in the inlet wall and exit section tests at Mach number of 2.51 and 3.01;the throat area is determined according to the start area shrinkage ratio at Mach=2.25

so that the inlet enables self-start at Ma=2.5 and above.The phenomenon of no hysteresis under stable subcritical condition is because of a high total pressure recovery and a flow pattern of inlet similar to external compression inlet.