基于有限元模拟的薄膜热流计冲击振动分析

实现发动机热端部件热流的精准监测对于发动机的冷却设计和可靠性提高具有重要意义，而薄膜热流计具有结构简单、不影响被测件气动外形以及对流场干扰小等特点。针对航空发动机在运行时产生的高振动及高冲击载荷下的薄膜热流计结构可靠性问题，采用有限元方法，建立薄膜热流计的有限元模型，分析了冲击以及随机振动对热流计结构可靠性的影响，并且提出了优化建议。优化后的热流计的最大位移及最大应力都明显减少，结构的可靠性明显提升，冲击振动测试以及划痕测试的结果也验证了薄膜热流计结构的合理性。

Shock and Vibration Analysis of Thin-Film Heat Flux Sensor Based on Finite Element Simulation

Achieving accurate monitoring of heat flow of turbine hot end components is of great significance for the cooling design and reliability improvement of the engine.The thin-film heat flux sensor has the characteristics of simple structure,no impact on the aerodynamic shape of the measured parts and small interference of the flow field.To solve the problem of structural reliability of the thin-film heat flux sensor under high vibration and shock load generated by the aero-engine,the finite element model of the thin-film heat flux sensor is established using the finite element method,and the influence of shock and random vibration on the structural reliability of the thin-film heat flux sensor is analyzed,also the optimization suggestions are proposed.It proves that the maximum displacement and maximum stress of the optimized heat flux sensor are significantly reduced.The results of the shock vibration test as well as the scratch test also confirm the reliability of the thin-film heat flux sensor structure.