Numerical simulation of cavitation characteristics of a pump-turbine and comparison with model test results

Demin Liu; Qinghua Shi; Yongzhi Zhao; Guozhen Wen

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Numerical simulation of cavitation characteristics of a pump-turbine and comparison with model test results

机译：水轮机汽蚀特性的数值模拟及与模型试验结果的比较

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The pump-turbine cavitation characteristic is calculated by the N-S equation, RNG k - £ model and modified mixture model. The following conclusions have been drawn:rn1.The pump-turbine efficiency is calculated at different operation points in accordance with the experiment result, there is a rapid decrease in efficiency when the Thomas number is smaller than the critical Thomasrnnumber at three different flow rates. The average difference between experiment and simulation is 0.4 per cent. 2.The cavitation bubble distribution is calculated in the pump mode. For discharges lower than the optimum flow, cavitation bubbles can be observed on the suction side of the profile. For discharges higher than the optimum, the cavitation appears on the pressure side of the profile. The cavitation characteristic becomes serious as the flow rate increases in turbine mode.

机译：通过N-S方程，RNG k-£模型和改进的混合模型来计算水轮机汽蚀特性。得出以下结论：rn1。根据实验结果计算出不同工况下的水轮机效率，在三种不同流量下，当托马斯数小于临界托马斯数时，效率迅速下降。实验与模拟之间的平均差异为0.4％。 2.空化气泡分布是在泵模式下计算的。对于低于最佳流量的排放，可以在型材的吸入侧观察到气蚀气泡。对于高于最佳排放量的排气，气穴出现在型材的压力侧。在涡轮模式下，随着流量的增加，气蚀特性变得严重。

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来源
《International Journal on Hydropower & Dams》 |2012年第4期|p.78-83|共6页
作者
Demin Liu; Qinghua Shi; Yongzhi Zhao; Guozhen Wen;
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Dongfang Electric Machinery Co. Ltd, 188 Huanghe West Road, Deyang, Sichuan, 618000, China;

Dongfang Electric Machinery Co. Ltd, 188 Huanghe West Road, Deyang, Sichuan, 618000, China;

Dongfang Electric Machinery Co. Ltd, 188 Huanghe West Road, Deyang, Sichuan, 618000, China;

Dongfang Electric Machinery Co. Ltd, 188 Huanghe West Road, Deyang, Sichuan, 618000, China;

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Numerical simulation of cavitation characteristics of a pump-turbine and comparison with model test results

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