直冷却通道斜置肋片传热特性的数值研究

Numerical Research on Heat Transfer Characteristics of the Oblique Rib in Straight Cooling Channel

将燃气轮机涡轮叶片内部冷却的直管部分简化为方形截面带肋直冷却通道，并对简化直通道内部肋片在不同斜置角度下的换热特性和流动损失进行优化。针对直通道，进行了湍流模型对比及选取。将肋片的斜置角度30°～60°以5°为等差分为五种工况，然后利用CFX软件和自行编写的MATLAB程序对其进行模拟计算、数据处理、寻优和验证分析。结果表明：k-ε湍流模型与实验数值吻合较好，48.62°的斜置肋片能更好地提高带肋直冷却通道整体换热效果，30.34°的斜置肋片的综合换热性能最好。

The straight tube section of cooling passages in gas turbine blade was simplified to quadrate channel, and the heat transfer characteristics and flow losses at different oblique angles were optimized. Tur-bulence models were compared and selected. The inclined angle of the rib was divided into five different conditions from 30° to 60° based on 5°arithmetic scale. Then MATLAB and CFX were used to simulate and compute for optimization and verification analysis. The results show that k-ε turbulence model agrees well with experimental values;obliquely placed fins at the angle of 48.62° can improve the overall heat-transfer performance of cooling passages and comprehensive heat transfer of 30.34° placed fins functions best.