气动矢量喷管二次流对发动机性能的影响

Influence of Secondary Flow in Fluidic Thrust Vector Nozzle on Aero-engine Performance

关键词:  航空发动机  气动矢量喷管  数值模拟  二次流位置

Key words:  Aero engine  Fluidic thrust vector  Numerical simulation  Secondary injection position

摘要:

发动机处于推力矢量的工作状态时,二次流引气和喷射均会对发动机的部件匹配和性能产生影响。将气动矢量喷管置于发动机环境下,综合考虑了从风扇/高压压气机引出二次流,及二次流在喷管扩张段与主流的掺混等过程对发动机性能的影响。基于发动机部件匹配技术及CFD技术,对二次流对发动机性能的影响进行了数值模拟。结果表明:选取风扇或高压压气机引气实现气动矢量喷管,均会使发动机性能有较大幅度的下降；在满足二次流压力需求的前提下,宜采用风扇引气作为二次流气源。 

Abstract:

When the Fluidic Thrust Vector (FTV) nozzle of the aero-engine works, the bleeding and injection of the secondary flow both have an impact on the component-matching and engine performance.To study the effect of FTV nozzle on the aero-engine performance, the processes that air bleeds from fan/high pressure compressor (HPC) and that the air injects into the nozzle expansion section were considered. Based on the aero- engine component-matching and CFD technology, the influence of secondary flow on aero-engine performance was simulated. The results show that the performance of the engine decreases observably whether the secondary flow bleeds from fan or HPC. The secondary flow bleeding from fan is more suitable for FTV nozzle, when its pressure can meet the requirements. 