叶栅参数对反推力装置气动性能影响规律

针对某型叶栅式反推力装置，开展了气动性能数值预测的研究工作。采用本文提出的数值计算方法，在不同落压比下反推力预测值与实验值最大相差8．2％。流场速度等值线分布展示反推力装置叶栅内部流动特征．叶栅叶盆处的旋涡和叶背处的失速是导致气动性能下降的不利因素。大量数值计算结果揭示了叶片进入角、出流角、稠度等结构参数对轴向反推力、流量系数、总压恢复系数的影响规律。在本研究范围内，叶片进入角54°、出流角135°、稠度1.3的叶栅几何结构综合气动性能最优。

Numerical Study for the Effects of Cascade Geometry Parameters on Cascade-Type Thrust Reverser Performances

Aiming at a cascade-type thrust reverser, some numerical studies were performed to forecast the aerodynamic performances. Compared with the experimental data, it is indicated that the maximum error between the computational and experimental result is below 8.2% under the different nozzle pressure ratio. The velocity contour shows the inner flow characters in the cascades. The vortex located at the concave and the stall located convex of the vane has a disadvantage to the aerodynamic performances. The effects of inlet angle, outlet angle, and solidity on the performances are revealed by a lot of numerical results. With inlet angle of 54°, outlet angle of 135° and solidity of 1.3, the cascade has the best integrated aerodynamic performances .