Study on the Design of Supersonic Axisymmetric Multicompression and Quasi-isentropic Inlets

Based on the characteristics method, the design method of axisymmetric multi-compression and quasi-isentropic compression inlets are developed. For the multi-compression inlets, the solution strategy of shock wave angle for the leasttotal pressure loss is designed. For quasi-isentropic compression inlets, the design criteria of wall of quasi-isentropic compression inlets is come up with that the left Mach lines starting from the wall should intersect at the lip. The wall of axisymmetric multicompression and quasi-isentropic compression inlets under the condition of mach 4 is designed, and the numerical simulation results calculated by FLUENT shows that the distribution of the shock waves meet the design requirements, which validates the design method of this paper. The comparative study of the two kinds of inlets shows that: the quasi-isentropic compression has the advantage of total pressure recovery, while the drag on the wall of the quasi-isentropic compression is similar with that of three shock compression.