旋转冲压发动机进气道压比特性分析

对旋转冲压发动机进气道进行了数值模拟,得到不同转速下、不同出口背压条件下的流场分布,转速越大,进气道内激波系向后移动;背压越大,将导致附面层和激波增强,分离流迅速发展,进气道内激波系向前移动。利用量纲分析的方法和手段获得了进气道比较通用的变工况特性,分析了旋转冲压进气道的压比特性,压比流量特性主要受旋转冲压发动机进气道进口相对来流马赫数的影响,为后面旋转冲压发动机进气道保护控制打下了基础。

Characteristics analysis of pressure ratios for rotated ramjet inlets

The internal flowfield of rotated ramjet inlets was simulated numerically at different rotated speeds and backpressures.The effect of rotated speeds and backpressures on the internal flowfield of inlets was analyzed.The shock wave within the rampressor inlet moves backward when the speed increases,and it moves forward when the backpressures increases.The dimensional analysis method was introduced to find the variables describing the characteristics of pressure ratios.The results show that the characteristics of pressure ratios are mainly concerned with Mach number and the mass-captured coefficient,which supplies the foundation of inlet protection control.