雷诺数对超燃冲压发动机隔离段内激波串的影响

Influence of reynolds number on the shock train in scramjet isolator

雷诺数是超燃冲压发动机隔离段内激波串的重要影响因素之一。采用数值模拟的方法对不同来流雷诺数条件下的二维隔离段内流场特征进行计算,分析了来流雷诺数对隔离段内激波串起始位置和结构的影响。结果表明:在高马赫数来流时,雷诺数对激波串有一定的影响,但不明显;在适当马赫数(Ma=1.8-2)时,激波串起始位置与雷诺数呈线性关系;在低马赫数来流时,雷诺数对激波串的影响消失。

Reynolds number is one of important influence factors to the shock train in Scramjet isolator. The numerical method was used to simulate the characteristics of the isolator inner flow fields under different incoming flow Reynolds numbers,and the influences of Reynolds numbers to the location and the structure of the shock train in the isolator were analyzed The results show that Reynolds number has some but not obvious influences to the shock train under the high incomingflow Mach numbers. The location of the shock train has a linear correlation with the Reynolds number when the Mach number is proper （Ma=1.8-2）. The influence of Reynolds number on the shock train disappears when the incomingflow Mach number is low.