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首页> 外文期刊>International Journal of Fluid Machinery and Systems >Performance and Flow Field of Gravitation Vortex Type Water Turbine using Volute Tank
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Performance and Flow Field of Gravitation Vortex Type Water Turbine using Volute Tank

机译：使用蜗壳罐的高压涡流式水轮机的性能和流动场

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摘要

Gravitation vortex-type water turbines use gravitational vortex generated when water is guided into the tank and drained from the hole at the bottom of the tank. When a circular tank is used, a runner inlet flow becomes uneven circumferentially, resulting in poor performance. To control the flow in the tank and make it uniform in the circumferential direction, we used a volute tank to elucidate the impact of tank geometry on the performance and flow field of the gravitation vortex-type water turbines. We further investigated the performance and flow field of the water turbine using volute and circular tanks through experiments and free surface flow analysis. We compare the performance and flow field of the volute tank to those of the circular tank. We found that the effective head and turbine output of the volute tank decreased more than those of the circular tank, whereas the water turbine efficiency of the volute tank improved more than that of the circular tank at low to medium rotational speeds. This is because the theoretical head of the volute tank was smaller than that of the circular tank, but the runner inlet flow was uniform in the circumferential direction, and the loss in the tank, which is the dominant loss in the circular tank, was greatly reduced.
机译：引力涡流式水轮机使用喷水时产生的重力涡流，并从罐底部的孔中排出。当使用圆形罐时，跑步器入口流量变得不均匀，导致性能差。为了控制罐中的流动并在圆周方向上使其均匀，我们使用蜗壳罐来阐明罐几何形状的冲击对引力涡流式水轮机的性能和流场。我们进一步通过实验和自由表面流动分析研究了使用蜗壳和圆形罐的水轮机的性能和流场。我们将蜗壳罐的性能和流场比较到圆形罐的性能和流场。我们发现蜗壳罐的有效头和涡轮机输出减少了圆形罐的大于圆形罐的涡轮机，而蜗壳罐的水涡轮效率在低至中等转速下的圆形罐的水涡轮机效率提高。这是因为蜗壳罐的理论头小于圆形罐的理论头，但是流道入口流在圆周方向上均匀，并且罐中的损耗是圆形罐中的主干损失减少。

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