压力畸变试验进气道轴向力数值计算研究

Numerical study on axial force of air intake in total pressure distortion test

航空发动机在地面试车台进行进气压力畸变试验时,带插板的进气道由于气动载荷的影响会受到较大的轴向力冲击,从而将受到的轴向力传递给固定进气道的进气道支架进而又作用到试车台动架,并对发动机及台架安全造成影响。为评估进气道所受的轴向力大小,采用Fluent软件进行流场计算和数值积分的方法,对插板位于进气道2个典型位置的模型进行了数值分析。结果表明:带插板的进气道所受的轴向力主要来自于进气道唇口和插板2部分,并且2个分力方向相反;2个典型位置所受合力的方向都为发动机逆航向,合力大小分别为107 N和13183 N。

During aero-engine inlet total pressure distortion test on the ground test bed,the air intake with flash-board will be impacted by axial force because of aerodynamic load.The axial force then is transmitted to the intake duct bracket that fixes the intake port,which in turn acts on the test bench moving frame,and affects the safety of the engine and the test bench.For evaluating the axial force,CFD Fluent and numerical integral were used to simulate the 3D model of the flash-board at the locations of A and B.The results show that the axial force comes from the lip of the air intake and the flash-board,and the direction of the force is reverse.The direction of the resultant force at the two locations,which is 107 N and 13183 N separately,is counter to the course of aero-engine.The resultant force is.