Sun Shu

A Fluidic Control Method of Shock Train in Hypersonic Inlet/Isolator

The characteristics of shock train in hypersonic inlet/isolator differ from that in directconnect conditions. In order to avoid violent stream-wise and transverse oscillation in isolator, a fluidic control method were proposed. This method combines the boundary suction and the slot injection method together. For the sake of checking out the control effect of the concept, two contrast wind-tunnel experiments were completed in M0=4.92 hypersonic wind tunnel. According to the experiment results, as the shock train moving upstream, the mass flow rate of secondary flow increased and the slip line moving towards to the bottom wall, meanwhile a series of weak shocks generated by injection got stronger that increased the pressure upstream the shock train. The shock train interacted with upstream background shockwaves, and the travelling processes can be divided into 4 stages which were much simpler than that of uncontrolled flow. Although there was one unstable stage, the shock train behaved in a much milder manner with an oscillation frequency of 641Hz and the maximum oscillation power decayed to 20% of that of uncontrolled flow, and the maximum sustainable back pressure almost equal to that of uncontrolled flow.