针对一种桨栅呈辐状式分布的冷却塔用新型水轮机，本文设计出一种适用于该水轮机的特型蜗壳，该蜗壳在结构上首次采用由圆形截面向椭圆截面过渡的轴向出水方式，这种设计不仅能有效节省冷却塔内部空间，同时也具备可观的引水性能。本文蜗壳设计采用了理论分析和CFD数值模拟计算相结合的设计和优化方式，根据蜗壳纵向断面压力和速度分布图得出其断面处的压力和速度分布规律；结合蜗壳出口处速度矢量图，分析出口环面上标称圆圆周速度、随机点轴向速度和圆周分速度矩的分布特点，结果表明，该蜗壳的水力性能与理论设计相符，具有很高的实用价值。
Abstract
Aiming at a new type of hydraulic turbine with radial distribution of impellers for cooling towers, this paper designs a special volute suitable for the turbine, which, for the first time in structure, adopts the axial effluent transitioning from circular truncation to elliptical section, which not only can effectively save the interior space of the cooling tower, but also has considerable water diversion performance. In this paper, the design and optimization of the volute are based on the combination of theoretical analysis and CFD numerical simulation, and the pressure and velocity distribution of the volute sections are obtained according to the distribution diagram from CFD calculation. With the analysis of the velocity vectogram of volute outlet, the distribution characteristics of nominal circular circumference velocity, random point axial velocity and circumference velocity moment on ring surface of volute outlet are concluded. The results show that the hydraulic performance of the volute is consistent with the theoretical design and it has high practical value.
关键词
冷却塔 /
水轮机 /
轴向出水 /
蜗壳 /
CFD
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Key words
cooling tower /
hydraulic turbine /
axial outflow /
volute /
CFD
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参考文献
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