基于流固耦合的反推力装置负载特性

Load characteristics of thrust reverser based on fluid-structure coupling method

反推力装置负载特性是其运动机构及驱动作动器强度设计的基础,其中阻流门所受气动载荷及其应力分布计算是核心。以叶栅式反推力装置为对象,采用重叠网格方法实现阻流门和滑动整流罩的旋转以及平移运动网格划分,在STAR-CCM+软件环境下确定了流固耦合交界面的数据映射与交换关系,由此建立了反推力装置流固耦合数值分析模型。对反推力装置在飞机降落时正常打开和起飞滑跑紧急终止时应急打开两种动态过程进行仿真,结果表明:随阻流门旋转,阻流门所受气动载荷与等效应力快速增加,并在旋转角度为50°附近达到最大,且在应急终止起飞状态下打开反推力装置,阻流门承受的最大气动载荷是正常打开过程的3倍以上。

The load characteristics of the thrust reverser are the basis of the strength design of its kinematic mechanism and drive actuator,in which the calculation of the aerodynamic load and stress distribution on the blocker door is the core.Taking the cascade thrust reverser as the object,the overlapping grid method was used to achieve the movement of the boundary grid of the translating sleeve and blocker door components,at the same time,the data mapping and exchange relationship of the fluidstructure coupling interface was formed in the STAR-CCM+software environment.Based on these,the fluid-structure coupling numerical analysis model of the thrust reverser was established.The two dynamic processes of the thrust reverser normal opening during landing and emergency opening during takeoff were simulated.Results showed that with the rotation of the blocker door,the aerodynamic load and equivalent stress on the blocker door increased rapidly,and reached the maximum near the rotation angle of 50°.Moreover,the maximum aerodynamic load on the blocker door was more than 3 times of the normal opening process when the thrust reverser was opened under emergency termination takeoff state.