On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2019-03-03 DOI:10.1155/2019/5375149

E. Agnalt, I. Iliev, B. W. Solemslie, O. Dahlhaug

引用次数: 17

Abstract

The rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative to the runner angular position by utilizing an absolute encoder mounted on the shaft end. From the literature, the pressure in the analyzed area is known to be a combination of two effects: the rotating runner pressure and the throttling of the guide vane channels. The measured pressure is fitted to a mathematical pressure model to separate the two effects for two different runners. One turbine with 15+15 splitter blades and full-length blades and one pump-turbine with six blades are investigated. The blade loading on the two runners is different, giving different input for the pressure model. The main findings show that the pressure fluctuations in the guide vane cascade are mainly controlled by throttling for the low blade loading case and the rotating runner pressure for the higher blade loading case.

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低比转速混流式水轮机动静相互作用效应研究

利用无叶空间和导叶叶栅中的压力传感器，分析了低比转速混流式水轮机和水泵水轮机中的转子-定子相互作用。通过使用安装在轴端的绝对编码器来分析相对于转轮角位置的测量值。从文献中可以看出，分析区域内的压力是两种影响的组合：转轮压力和导叶通道的节流。测量的压力被拟合到数学压力模型中，以分离两个不同跑步者的两种影响。研究了一台带有15+15分流叶片和全长叶片的涡轮机和一台带有六个叶片的水泵水轮机。两个转轮上的叶片负载不同，为压力模型提供了不同的输入。主要研究结果表明，对于低叶片载荷情况，导叶叶栅中的压力波动主要由节流控制，而对于高叶片载荷情况则主要由转轮压力控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.