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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。
When the engine is in the working state of the thrust vector, the secondary air bleed and injection will affect the engine parts matching and performance. The pneumatic vector nozzle placed in the engine environment, taking into account the fan / high-pressure compressor leads to the secondary flow, and the secondary flow in the nozzle expansion section with the mainstream of the mixing process on the engine performance. The effects of secondary flow on engine performance are numerically simulated based on engine part matching technology and CFD technology. The results show that the selection of fan or high-pressure compressor air to achieve pneumatic vector nozzle will result in a significant decline in engine performance; to meet the secondary pressure needs of the premise, it is appropriate to use the fan as a secondary air flow source.