二次流喷射对喷管流场性能的影响

Effect of secondary flow injection on flow field and performance of nozzle

关键词:  发动机喷管  二次流  数值仿真

Key words:  Engine nozzle  Secondary flow  Numerical simulation

摘要:

采用有限体积法求解二维守恒型雷诺平均N-S方程,数值模拟了单膨胀斜面喷管内外流场,研究了二次流喷射对单膨胀斜面喷管非设计状态性能的影响,给出了性能随喷射流量、喷射总压和喷射角度的变化规律。计算结果表明,在喷管下斜板尾缘进行二次流喷射可以提高喷管非设计状态性能,喷射流量和喷射角度是影响喷管性能提高的主要因素,并存在最优的喷射流量和喷射角度,喷射总压对喷管性能影响较小。

Abstract:

The numerical simulation of 2D internal and external flows for single-expansion-ramp nozzle(SERN) with secondary injection was conducted by solving the Reynolds Averaged N-S equation with finite volume method.The effect of secondary injection on off-design performance of nozzle was investigated and some parameters including the mass flow rate of injection,the total pressure of injection and the angle of injection were studied in more detail.The results indicate that improvement of performance has been achieved by secondary injection at the tip of lower flap.The mass flow rate and angle of injection which have optimum values are important factors while the total pressure of injection has minor effect.