内喷管间隙宽度对线性塞式喷管性能的影响

Effects of Gap Width between Nozzles on Linear Plug Nozzles Performance

为了了解内喷管间隙宽度对线性塞式喷管性能的影响,提出了对应着同一个内喷管的三种不同间隙宽度的塞锥。采用数值模拟的方法,得到了不同间隙宽度的线性塞式喷管在不同工况下的流场和性能。比较了不同间隙宽度对线性塞式喷管性能的影响,结果表明:增加内喷管间隙会增大线性塞式喷管的面积比和设计压比;内喷管间隙变宽,塞锥表面的压强下降,塞式喷管的性能下降,间隙宽度增大一倍,塞式喷管性能下降1%～3%。另外在计算过程中发现,内喷管的性能是整个线性塞式喷管性能的主要组成部分,占了整个塞式喷管性能的三分之二以上。

To understand the effects of gap width between nozzles on linear plug nozzles performance, three plugs with different wide gaps were brought forward, which were fixed on the same inner nozzle. Numerical method was employed. Flowfields and performances of plugs with different gaps were obtained. Ways of gap width affecting linear plug nozzles' performance were found: increasing of gap width could augment linear plug nozzles' area ratio and design pressure ratio, decreasing pressure on plug surface and performance of linear plug nozzles. When gap width was augmented twice, performance of linear plug nozzles was reduced by 1% - 3%. In addition, it is found that performance of inner nozzle is the largest part of that of linear plug nozzles, accounting for more than two thirds of whole engine's performance.