狭缝宽度对分离式柱肋冷却通道内传热与流动影响的数值计算

在雷诺数为8 200~52 500内分别针对宽度为1.0,1.5,2.0,2.5mm的分离式柱肋冷却通道和同类型的柱肋冷却通道进行了传热特性和流动性能的三维稳态数值计算研究.数值计算采用结合加强壁面处理的realizable k-ε模型.将计算结果进行网格独立性验证和实验验证以保证数值计算的准确性.在所研究的Re数范围内着重分析了分离式柱肋中间狭缝宽度对冷却通道内流场和局部换热特性的影响.数值计算结果表明:分离式柱肋狭缝宽度对冷却效果有很大的影响,在研究的Re数范围内,分离式柱肋存在一个最优宽度,使得冷却效果最佳.

A Numerical Study of Thermal Performance and Pressure Loss in a Cooling Channel with Detached Pin Fins

This paper investigated the influence of the width of detached space on the thermal performance and flow resistance in a cooling channel over the Reynolds number range from 8 200 to 52 500. The three dimensional steady state simulation was conducted to investigate heat transfer and pressure loss characteristics of detached pin fin arrays with different widths in cooling channels. The numerical results are tested by three grid strategies, and the numerical method was validated by experimental data. Numerical results show that in the researched Re number range, the width of detached pin fin has a great influence on the cooling ability while the width of the detached pin fin has an optimal value to make the best cooling performance. Key words： detached pin fin; turbine blade cooling; width of pin fin; flow and heat transfer