波形隔板形状对通道流动和换热的影响

采用数值模拟的方法,对基于波形隔板结构涡轮叶片尾缘复合通道的换热和流阻特性进行研究.设计了一种直隔板和三种不同折角的波形隔板结构,研究波形角度对通道中流动和换热的影响.数值结果表明,波形隔板结构折角越小,对整个通道,换热越好,尤其是对于第1通道,换热增强最大可达30%;同时折角越小,通道的流阻系数越大;从换热和流阻的综合效果来看,150°折角波形隔板结构和直隔板结构(180°折角)相当,120°折角和90°折角波形隔板结构的综合换热效果比直隔板结构的略大. 

Effect of the shape of divider wall on heat transfer and flow resistance characteristic of passage

Numerical simulation was performed to obtain heat transfer and flow resistance characteristics in a channel with zigzag divider wall in the trailing edge passage of turbine blade.One traditional divider wall and three configurations of zigzag divider walls with different angles were applied to research the effect of angle on the heat transfer and flow resistance.The calculated results indicate that the heat transfer is improved with decrease of the angle of the zigzag shape.For the first passage,the highest improvement was nearly 30 percent.At the same time,the passage with small angle divider wall encountered bigger flow resistance.By comparison of integrated effect of heat transfer,the configurations with smaller angle divider walls have higher values than those with larger angle divider walls.