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为了优化贯流式水轮机桨叶的叶型,引入边界涡量动力学理论。对初始设计的导叶和桨叶叶型进行全流道三维湍流模拟,分析了桨叶表面上边界涡量流分布状态,找到了局部流动不良的部位。通过调整设计中给定的速度矩分布规律,对桨叶叶型进行优化。叶型改进后,桨叶轮毂附近和进口边附近边界涡量流分布明显改善,转轮效率提高。计算表明:桨叶表面上边界涡量流分布状态更有效地反映了转轮的流动性能,能够为叶型优化提供可靠的依据。
In order to optimize the blade shape of tubular turbine blades, the theory of boundary vorticity dynamics is introduced. Full-runner three-dimensional turbulent simulation of the guide vane and blade profile of the initial design was carried out. The distribution of the vorticity flow at the boundary of the blade surface was analyzed, and the site of partial flow failure was found. The blade profile is optimized by adjusting the law of velocity distribution given in the design. After the improvement of the blade shape, the distribution of vorticity near the impeller hub and the boundary near the inlet edge is obviously improved, and the efficiency of the runner is improved. The calculation shows that the distribution of vorticity on the boundary of the blade surface reflects the flow performance of the runner more effectively and can provide a reliable basis for the optimization of the blade shape.