Effects of boundary-layers bleeding on performance parameters of hypersonic inlets

摘要

Purpose - The purpose of this paper is to study the effects of boundary-layers bleeding on performance parameters of hypersonic inlets.rnDesign/methodology/approach - The inner flowfield of a hypersonic inlet at different bleeding rates is simulated with a Reynolds-averaged Navier-rnStokes solver using a renormalization group k-ε turbulence model.rnFindings - In contrast with no bleeding, the performance parameter of hypersonic inlets without backpressure is reduced slightly, but the flowrnuniformity is improved. The interaction between boundary layers and shocks is weakened at the action of the bleeding, which leads to that thernboundary-layers separations at the entrance of the isolator caused by the high-backpressure occur later, and it can improve the maximumrnbackpressure ratio of hypersonic inlets. With the bleeding rate increasing, the maximum backpressure ratio of hypersonic inlets is added, while therntotal-pressure recovery coefficient and mass-captured coefficient are reduced.rnOriginality/value - This paper is a useful reference to the design and performance improvement of hypersonic inlets and propulsion systems.