| Citation: | JIN Yichao, YAN Chao, LIN Boxiet al. Effect of injection on starting characteristics of hypersonic inlet[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2302-2309. doi: 10.13700/j.bh.1001-5965.2017.0191(in Chinese)
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In order to explore the feasibility of using injection technology to reduce the start Mach number of hypersonic inlet, the flow field of the two-dimensional hypersonic inlet was calculated by numerical simulation. The effect of injection on the hypersonic inlet was analyzed by comparing the flow field structure, mass-captured coefficient and total pressure recovery coefficient under different working conditions, and the influence of jet velocity, pressure and angle of inclination on starting performance of the inlet was also studied. The analysis results show that the change of original interference form of the shock wave and inlet boundary-layer is the main reason for the reduction of the start Mach number of inlet. The study also shows that increasing jet velocity is conducive to improving the control effect, but increasing jet velocity continuously would result in an increase in the back pressure of the isolation section. This phenomenon is related to the jet pressure, and reducing the jet pressure could expand the effective jet velocity range to start the inlet. At different jet angles of inclination, the above rules are consistent. The simulation results reveal the systematic rule of changes of the inlet starting ability with injection parameters, which can be used to guide engineering design and optimization.
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