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应用数值方法和标准κ-ω两方程湍流模型,研究了轴流涡轮叶顶间隙泄漏流场以及端区损失产生机理,同时考虑了进口攻角以及大范围变化间隙的影响.结果表明;间隙内部的泄漏流动情况可以被细分为“攻角驱动型”和“压力驱动型”两种类型,而大多数的泄漏流动则是由叶顶后部的压力驱动型泄漏造成的。动叶通道中间隙泄漏涡和通道涡之间存在着强烈的相互作用,只有在适当大小的间隙下,泄漏涡和通道涡的相互作用才可以被有效利用。
The two-equation turbulence model with the standard κ-ω method was used to study the leakage flow field at the top of the axial turbine blade and the mechanism of the end-zone loss, taking into account the influence of the entrance angle of attack and the wide-ranging gap variation. The results show that, The leakage flow can be subdivided into two types: “angle-of-attack” and “pressure-driven”, whereas most of the leakage flow is caused by pressure-driven leakage at the back of the blade. There is a strong interaction between the vortex shedding vortex and the vortex shedding in the moving vane channel, and the interaction between the leakage vortex and the vortex shed can be effectively utilized only with a proper clearance.