涡轮叶片带肋通道换热性能数值和试验研究

Numerical simulation and experimental investigation of heat transfer performance of turbine blade with ribbed channel

采用数值模拟与试验测试相结合的方法,利用涡旋核心可视化技术对于带肋通道内部流动与换热机理进行研究。对于宽高比为1的45°斜置带肋直通道的原型结构(无切除结构)和另外6种优化结构,全部肋片在流动方向下游切除2个肋高(3.8 mm)的改良结构在综合换热性能上表现最优,相对于原型结构的带肋面平均Nu数、平均Nu数比和平均换热因子分别增长25.1%,24.8%,22.7%;经试验验证,带肋通道外壁面温度的试验值与数值模拟值误差在10%左右。

A combination of numerical simulation and experimental test is carried out,and the vortex core visualization technology is adopted to visualize vortex in the flow field and study the heat transfer mechanism.The heat transfer characteristics of air flow in 45°ribbed straight channel with aspect ratio of 1 and the other 6 new ribbed channels are studied.The results show that the average heat transfer performance of the new ribbed channel with all the fins 3.8 mm cut at the far end of fins along the flow direction is the best by comparing with the original ribbed straight channel under the same conditions.The average Nu,the average Nu/Nu 0 and the average heat transfer enhancement factor F T of the ribbed wall is increased respectively by 25.1%,24.8%,22.7%on the average by comparing with the original ribbed channel.The experimental results show that the error between the experimental value and the simulated is about 10%for the outer wall temperature of ribbed channel.