泡状隔板对涡轮叶片内冷通道换热和流阻的影响

为增强涡轮叶片内部通道的换热、减小流动阻力,提出了一种新型的泡状隔板结构。通过实验与数值模拟相结合的方法,研究了等热流边界条件下泡状隔板结构的半径以及形状对通道换热和流阻特性的影响,并与直隔板进行对比,实验结果表明:在研究范围内,对称型泡状隔板结构能够大大减小通道流动阻力,随着泡状结构半径的增大,减阻效果增强;不对称型泡状隔板结构只在半径最大时能减小流动阻力;泡状结构对于换热的影响并不明显。实验结论可以为涡轮叶片内部冷却通道的优化设计提供理论依据。

Effect of Bubbled-Shaped Divider Wall in Turbine Blade on Heat Transfer and Pressure Drop

In order to enhance the heat transfer inside the turbine blade and reduce the pressure drop of the channel, a new bubble-shaped divider wall was proposed. An experimental study and numerical simulation was performed to obtain heat transfer and pressure drop characteristics of the channel with different radius and shape of the bubble configuration and typical traditional configuration. Isothermal boundary condition was used. With the scope of the study, it was found that the symmetrical bubble-shaped divider wall can greatly reduce the pressure drop of the channel. As the radius increases, the reduction effect became more obvious. Asymmetric divider wall reduced pressure drop only at maximum radius. The effect of bubble structure on heat transfer was not obvious. The experimental conclusion can provide a theoretical basis for the optimal design of the internal cooling channel of the turbine engine.