Experiments of sidewall compression scramjet inlet on dynamic characteristic of angle-of-attack

In order to research the influence of dynamic angle-of-attack on the performance of hypersonic inlet,wind tunnel experiments were conducted on a sidewall compression scramjet inlet with Ma=3.85,range of angle-of-attack 0°~8.2° and frequency up to 10.4 Hz.The present work suggests that:with the high angle-of-attack,the inlet could work in unstart mode,and flow field features are significantly altered and also analyzed by a computational fluid dynamics (CFD) solver.In the dynamic process of angle-of-attack,the inlet could go through a start-unstart-restart process but the pressure on the wall has the hysteresis effect,especially when the inlet is unstart.With the rise of frequency,the value of unstarting angle-of-attack could increase and restarting value could decrease in the oscillation.