Study On Inverse Design Law Of Hypersonic Compression Surface

Inverse design is an advanced method in the designing of the hypersonic curved compressionsurface.It can control the developmental law of the parameters along the wall directly to ensure the wholecompression surface has more reasonable law of pressure rise and velocitydecline. Based on the machnumber distribution and the pressure distribution, the hypersonic curved compression surfaces weredesigned and studied by the method of characteristics.Based on the mach number distribution along the wall, the influence of the law of velocity decline onthe performance of the compression surface, and the law of velocity rise depends on the mach numbergradient of the inflexion. The results indicated that the performance improved linearly while the machnumber of the inflexion increased. The compression surfaces was designed to comply with the machnumber distribution of two cubic functions and each of them was controlled by mach number gradients ofthree points. In addition, the control point located at the front has greeter effect on the aerodynamicperformance, while the outlet control point has little effect on the pressure distribution of the wall near it.Based on the pressure distribution and the mach number distribution, the compression surfaces withconstant pressure gradient and constant mach number gradient were designed and studied respectively. Thehypersonic compression surface is divided into two segments, the design method of the preceding segmentis based on constant mach number gradient while the following segment is based on constant pressuregradient. The characteristics of the flow field and the performance of the compression surface are studiedby numerical simulation method. The results indicate that, the preceding segment has great effect onaerodynamic performance while the following segment has small effect, also, the outlet of the compressionsurface designed by this method has better airflow distribution uniformity than the compression surfacedesigned only by constant mach number, so the condition of the outlet of the compression surface will beimproved.