几何高度对RBCC发动机超声速侧压式进气道起动性能的影响

Influence of height on the starting performance of RBCC engine supersonic sidewall-compression inlet

对两类典型的侧压式进气道在来流Ma=1.5~5.0范围内的起动性能开展数值模拟研究,研究了几何高度对进气道性能的影响.研究发现：不同高度的进气道起动过程所表现出来的流场特征差别较大,对于合适的高度,进气道未起动时的性能大为改善,起动过程的性能变化趋于平缓,起动马赫数较小（存在最小值）,此时进气道具有较好的起动性能并能在来流马赫数小于自起动马赫数时较好工作.

The starting performances of two typical supersonic sidewall-compression inlets were investigated from Mach number 1.5 to 5.0 by means of numerical simulation.The influence of height on performance was studied.The investigation shows that the flow features of inlets with different heights differ a lot during the starting process.For a proper height,the inlet performance prior to startup is improved significantly,oscillations of performance parameters become weaker,and the self-starting Mach number is smaller（a minimum value exists）.In such case,the inlet with this height has a better starting performance,and can operate well when the incoming Mach number is less than self-starting Mach number.