Dynamic characteristics in ramjet inlet during acceleration phase

The dynamic characteristics in the integrated ramjet inlet during the boost and acceleration phase were studied by numerical simulations and wind tunnel tests.The results show the pressure oscillation in the inlet is close to a typical bulk mold instability in the phase,and the pressure oscillation frequency grows a little and the relative pressure oscillation amplitude decreases with the increase of flight Mach number,the maximum pressure possibly exceeding the stagnation pressure.