RBCC火箭对直扩通道抗反压能力的影响研究

Influence of RBCC rocket on resisting backpressure ability of straight-expanded flowpath

提高直扩通道抗反压能力,改善进气道/燃烧室匹配特性,是RBCC研究的重要方向。本文研究了在隔离段出口位置布置火箭对直扩通道的抗反压能力的影响,并对比了火箭中心和侧壁布置方式下的数值仿真结果。研究表明:火箭射流可以提高直扩通道的抗反压能力,且抗反压上限和火箭室压呈现出较好的线性关系;火箭侧壁布置较中心布置抗反压能力稍强;火箭侧壁布置,火箭高室压和高反压条件下,背压激波以正激波形态存在。

It is an important direction of RBCC study to improve the straight-expanded flowpath resisting backpressure ability and the matching of inlet and combustor. The influence of RBCC rocket at the isolation exit on the resisting backpressure ability of straight-expanded flowpath is investigated.The results of numerical simulation of two different rocket layout modes(the axes rocket and the sidewall rocket) are contrasted. The investigation shows that the jet flow of RBCC rocket can improve the resisting backpressure ability of straight-expanded flowpath, and the upper limit of resisting backpressure increases with the increase of rocket combustor pressure, which conforms with linear relation. The resisting backpressure ability of the sidewall rocket is slightly higher than that of the axes rocket. The backpressure shock wave exists in a normal shock wave form, if the combustor pressure and the backpressure of the sidewall rocket are high.