The restarting characteristics of the two-dimensional mixed-compression hypersonic inlet are numerically studied with time-average N-S equations,the thermally perfect gas model,and SST turbulence model. The emphasis is laid on the influence factors such as the Mach number of the incoming gas,the internal contractive ratio of the inlet and the thickness of the boundary layer in the inlet. And the effect mechanism for each factor is analyzed in detail. The results show that the Mach number of the incoming gas,the internal contractive ratio and the thickness of the boundary layer in the inlet are the key influence factors of the restarting characteristics of the hypersonic inlet. The restarting hysteresis loop of the hypersonic inlet with a relatively low internal contractive ratio and thin boundary layer in the inlet is wider,and the corresponding restarting Mach number is higher. The thickness of the boundary layer in the inlet and the inner contractive ratio determine the typical characteristics of the unstart field of the hypersonic inlet.
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the Mach number of the incoming gas
the internal contractive ratio
the thickness of the boundary layer