载荷对高温合金GH4169/K417间接触热导影响

Effect of Interface Pressure on Thermal Contact Conductance across GH4169/K417 Interface

摘要:

采用自主研制的带补偿加热的接触热导测试设备，对航空发动机用高温结构材料GH4169/K417间不同载荷（60~180 MPa）和不同粗糙度下的接触热导进行试验研究。研究了载荷对其接触热导的影响行为，对比分析了有、无补偿加热条件下的接触热导测试结果。结果表明，带有补偿加热的接触热导测试装置能有效降低横向热流损失。不同粗糙度的GH4169/K417材料组合，接触热导随载荷变化规律一致，且粗糙度较大时接触热导值较大，两者的差值随载荷先增加后减小，主要与平行刀纹的界面啮合作用有关

Abstract:

An experimental investigation was conducted with pressed pairs of aeroengine hot-end components structure material GH4169/K417 under different interface pressures (60~180 MPa) and surface roughness using the self-developed experimental apparatus to study the effect of interface pressure on thermal contact conductance (TCC). The testing results of TCC under the conditions with and without compensation heater were studied and compared. The results show that the thermal contact conductance experimental apparatus with compensation heater can effectively reduce the lateral heat loss. The effect of contact pressure on thermal contact conductance of specimens with different surface roughness is basically the same, and the specimens with bigger surface roughness have larger TCC values. The differences between these two conditions increase first and then decrease, which depends mostly on the engagement between the rough surfaces when the lay direction is parallel.