反压作用下隔离段性能估算方法研究

在前期隔离段研究结果基础上，对不同来流马赫数及不同反压下等直隔离段的出口温度、压力和马赫数进行了分析。通过大量拟合，得到了不同反压下隔离段出口温度、压力及马赫数间的拟合式，给出了预估任意反压下，隔离段出口马赫数和温度的方法；研究了隔离段最大承受反压与无反压下隔离段出口马赫数的关系，分别给出了均匀来流和非均匀来流时隔离段最大承受反压的拟合关系式，为最大反压比的估算提供了方法；同时还给出了均匀来流条件下等直隔离段长高比的工程选取拟合式。

Predicting Method of the Performance for Constant Area Isolator under Back Pressure

The flow filed in the isolator of a typical hypersonic inlet was simulated with uniform and non-uniform(with oblique shock) inflow., The pressure-temperature-Mach number at isolator exit relationship was investigated, the relationship of that each other is presented, and all of that is independent on the isolator length. The predicting methods of the performance for constant area isolator under back pressure were studied, and doable predicting method of isolator under back pressure were presented. The concept of Maximum Pressure Capability was present that when the back pressure is greater than the maximum pressure capability, the inlet will unstart. It was observed that the maximum pressure capability has relationship with the exit Mach number of the isolator with no back pressure. The predicting methods of Maximum Pressure Capability for constant area isolator were presented. The maximum pressure-isolator length relationship was also presented.