叶栅安装角对无阻流板式叶栅反推装置性能影响的研究

Influence of Cascade Inlet Installation Angle on Performance of Blockerless Thrust Reverser

对某一无阻流门叶栅式反推装置的流场进行了数值研究,详细分析了不同叶栅安装角对反推性能的影响。结果表明叶栅安装角对流出反推窗口气流的质量流量、气流速度以及气流的流动方向产生影响,进而对反推效果产生影响。对于不同风扇进口压比,存在不同的最佳的叶栅安装角度,能使得反推效果最好。由于风扇压比不同,气流所具有的能量不同,风扇进口压比越低,其具有能量越小,进入反推窗口偏转角越大,最佳安装角越大。

The flowfield of the blockerless thrust reverser is investigated numerically;the effect of cascade inlet installation angle on the thrust reverse effectiveness is discussed.Result show that the mass flow,flow velocity and flow direction through the cascade slot are notably influenced by the cascade installation angle,then the thrust reverse efficiency is changed correspondingly.For the different fan inlet pressure ratio,an optimal cascade installation angle exists,which makes the thrust reverse efficiency best.The flow has different energy due to the different value of the fan inlet pressure ratio.The lower the fan inlet pressure is,the smaller energy the flow has,the flow deflection of the bypass flow forced by the secondary flow injection becomes stronger,and the corresponding flow angle in the cascade slot is bigger,resulting in a larger optimal cascade installation angle.