考虑精铸变形的涡轮叶片气膜冷却效率灵敏度计算方法研究OA北大核心CSTPCD

The precision casting process results in a random deviation between the turbine blade geometry and the design,which has an uncertain effect on the blade air cooling efficiency.The uncertainty of turbine blade contour deviation is a minor disturbance problem in geometry.A model for deformation in the investment casting of the turbine blade is established by using the investment casting simulation.According to PIV and the numerical simulation,a realizable k-epsilon turbulence model for fluid-heat coupling calculation was established.A sensitivity calculation method of cooling efficiency considering blade deformation was established,and the sensitivity variation of the turbine blade air-cooling efficiency with the blow ratio was calculated.The results show that the greater the deformation of turbine blades is,the greater the loss of the original cooling efficiency.The overall average blade deformation of 0.25 mm makes the overall air-cooling efficiency loss of about 5%,and the local deformation such as 0.70 mm at the rear edge of the blade make the average air-cooling efficiency to be a loss of about 8%.