超音速喷管收缩扩张段匹配问题研究

Research on Matching of Contraction and Expansion Section of Supersonic Nozzle

超音速喷管由收缩和扩张两段组成,是高速风洞中获得超音速流动的重要部件。对于超音速喷管收缩段设计方法的研究较多,但尚未见到喷管收缩段的几种设计型面曲线如何与扩张段合理匹配问题的研究。针对以上的问题,利用CFD数值模拟方法对几种收缩曲线与扩张段匹配问题进行了计算。通过对计算结果进行对比分析,发现不同收缩曲线对超音速喷管内流有一定的影响,分析了流场特征,展示了马赫数在喷管内部的分布。

Supersonic nozzle is an important component of supersonic flow in the wind tunnel composed by contraction section and expansion section. There is much research on design of convergent section of su- personic nozzle, but there is still less research on reasonable match of several convergent section curves and expansion section curves of supersonic nozzle. In this paper, CFD numerical simulations of the differ- ent contraction curve supersonic nozzle were conducted, and the results were analyzed. The similarities and differences between different contraction curves of the supersonic nozzle flow were found. The differ- ences of the flow in the supersonic nozzle with different contraction curve were also found. The character- istics of the flow field and the distribution of Mach number in the nozzle internal is analyzed and shown.