一种改进的轴流涡轮叶尖对泄漏流影响的数值研究

 结合基于压力修正的采用雷诺应力湍流模型加壁面函数的三维计算流体力学程序，通过改进涡轮叶尖表面结构以期减小叶尖间隙泄漏损失，即在传统叶尖边缘镶嵌肋条的基础上倾斜压力面肋条，对这种改进叶尖的某一轴流涡轮转子的泄漏流场进行了数值研究，并详细分析了不同肋条高度和肋条深度对泄漏流场的影响，最后计算了涡轮效率。结果表明：通过改进的涡轮叶尖对泄漏流动进行被动控制，压力面斜肋条可以阻碍泄漏流动，同时叶尖区域回流区也减小泄漏流动，从而涡轮效率提高；肋条高度对涡轮效率有较大影响，且有个最佳肋条高度值，在最佳肋条高度下涡轮效率提高0.215%；肋条深度对流场影响不大，但小肋条深度可以稍微提高涡轮效率。

Numerical Study of Influence on Tip Leakage Flow in Axial Turbine with an Improved Tip

In order to reduce the tip leakage loss, a pressure-correction based, 3D Reynolds-averaged Navier-Stokes equations CFD code with Reynolds stress model and wall function is used to simulate the effects of the passive control of an improved tip of a pressure side tip shelf with vertical squealer tip on the tip leakage flow in a turbine rotor. With different shelf heights and depths in an improved tip, the effect on the tip leakage flow, especially on the efficiency, is sequentially simulated and compared with...