太阳辐射对航空发动机露天试车台热变形的影响

Study on thermal deformation of aero-engine open bench model induced by solar radiation

航空发动机露天试车台暴露于室外大气环境中,太阳辐射将导致其结构热变形,直接影响测试精度。首先使用ASHRAE模型对ANSYS Workbench中Solar Calculator功能模块的辐射计算结果进行验证,确定了模块计算的准确性;然后基于Solar Calculator功能模块对露天试车台结构温度场进行计算分析,探究了太阳辐射对露天试车台结构热变形的影响。结果表明,利用Solar Calculator功能模块计算太阳辐射强度最大误差为5.20%,露天试车台因温度变化导致在x、y、z方向上分别伸长0.033%、0.107%和0.020%。还对基于有限元结构建模与利用线膨胀系数估算的结构变形进行了计算,两种算法的平均误差在6.52%以内,验证了有限元模型用于热变形计算的合理性。

The aero-engine open-air test bench is exposed to the outdoor atmospheric environment,and the solar radiation will cause its structural thermal deformation,which directly affects the test accuracy.Firstly,the radiation calculation results of Solar Calculator function module in ANSYS Workbench were ver⁃ified by ASHRAE model to determine the correctness of the model,and then the temperature field of the open-air test bench structure was calculated and analyzed based on Solar Calculator function module to in⁃vestigate the influence of solar radiation on the structural heat deformation of the open-air test bench.The results showed that the maximum error of solar radiation intensity calculated by using Solar Calculator func⁃tion module was 5.20%,and the open-air bench model elongated 0.033%,0.107%and 0.020%in x,y and z directions respectively due to temperature changes.The calculation of structural deformation based on fi⁃nite element structural modeling was also compared with that estimated using the coefficient of linear expan⁃sion,and the average error between the two algorithms was within 6.52%,which verified the reasonableness of the finite element model for thermal deformation calculation.