Tests And Numerical Simulation On Characteristics Of Self-Starting For Sidewall Compression Inlets

The advantages and design requirements of inlets have led to study of inlet's starting characteristics. In this thesis, hypersonic sidewall compression inlet's self-starting characteristics are numerical simulated and tested.With increasing Mach number of inflow gradually, the hypersonic sidewall compression inlets can self-start . Compared with the hypersonic sidewall compression inlet starting directly, characteristics are different. Moving cowl, decreasing interior contraction ratio also can realize the hypersonic sidewall compression inlet's self-starting because of separation bubble on sidewall spilling out. It is no effect on a sidewall compression inlet's starting characteristics while a starting sidewall compression inlet is moved cowl to increase interior contraction ratio appropriately. Back pressure effect on characteristics of self-starting for hypersonic sidewall compression inlet is tested in Mach 3.85 wind tunnel.The hypersonic sidewall compression inlet with interior contraction ratio 1.24 can self-start.Unstart hypersonic sidewall compression inlet caused by high back pressure can self-start by moving cowl to decrease interior contraction ratio.