Numerical investigation on adaptive flow-control of supersonic inlet based on air-bleeding multi-slots

An adaptive flow-control method based on air-bleeding multi-slots for a supersonic mixed-compression two-dimensional inlet was brought forward.Two inlet models with/without air-bleeding method were designed separately and a comparison of the inlet performance was conducted with numerical method.Effects of air-bleeding on the self-starting ability，critical performance and resistance characteristic were attained.Results indicated that setting a series of air-bleeding slots in the internal contraction region of the inlet can obviously improve the critical performance of the inlet without deterioration to its self-starting characteristics.Meanwhile，bleeding mass flow can be self-regulated with the movement of the incident shock of the lip and its reflected shock.Compared with the inlet without flow-control method，the maximum backpressure and the total pressure recovery coefficient of the inlet was raised by 12.15% and 7.11% separately at design operation by means of air-bleeding，with a cost of only 0.71% reduction of mass flow and 2.7% resistance increment.Moreover，the increment of resistance can be further reduced to only 1% at cruise operation.