主要几何参数对叶栅式反推力装置性能的影响

选取等厚叶栅进行数值模拟,采用混合网格生成技术,研究叶栅进口气流角、过渡段半径、叶片上下端轴向间距、稠密度和出口气流角对空气流量和轴向反推力的影响.计算结果表明:进口气流角、过渡段半径和叶片上下端轴向间距对风扇气流能否顺利导入叶栅起重要作用;稠密度影响着叶栅的出口面积和导流性能;出口气流角是反推力装置设计的关键因素,对反推性能起着决定性的作用.

Influence of cascade configuration on aerodynamic performance of a cascade thrust reverser

The study chose equal-thickness shaped cascade blades,with the technology of hybrid grid system,and studied the influence of inlet flow angle,transition-radius,axial space between upside and underside of vane,solidity and outlet flow angle on the mass flow and axial reverser thrust.The final computation results show:the inlet flow angle,transition-radius,axial space between upside and underside of vane play the important role in whether the fan flow inducts the cascade smoothly;the solidity affects the outlet area and diverted performance of cascade;the outlet flow angle is a key-factor of design of the cascade thrust reverser,so it gives direction to the aerodynamic performance of a cascade thrust reverser.