透平叶栅模化时粗糙度和雷诺数对性能的影响及修正方法

Influences of Surface Roughness and Reynolds Number on Performance of Scaled Turbine Vane and Correction Method

基于平板边界层理论和对流换热的雷诺比拟关系,通过粗糙度和雷诺数对表面摩擦因子f的影响规律,建立了透平叶栅模化实验的叶型损失系数ω和表面平均换热系数h^(-)与f之间的修正关联式。对比模化叶型与实验叶型的数值分析结果,在选定参数范围内,ω和h^(-)与f之间呈现良好的相关性,采用近似线性关系修正实验模型的叶型损失和平均表面换热系数,与模化叶型实际性能之间的误差均可控制在10%以内。

Based on the boundary layer theory of flat plate and the Reynolds analogy of convective heat transfer,the profile loss coefficientωand the averaged surface heat transfer coefficient h^(-)are correlated with surface fiction factor f in a scaled experiment of turbine cascade considering the influences of surface roughness and Reynolds number.Comparison of the simulation results of the scaled vane and the experimental vane shows a good correlation ofωand h^(-)with respect to f in the investigated parameter range.The profile loss and averaged surface heat transfer coefficient of the experiment vane are corrected through an approximate linear relationship.The error between corrected values and the actual performance of the scaled vane is controlled within 10%.