Experimental investigations of pressure fluctuations in low-head francis turbine model

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-08-08 DOI:10.1177/09576509241272804

Nitin Kumar Jhankal, Arun Kumar

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Abstract

The present study emphasizes the experimental investigations of pressure fluctuations characteristics of the steady flow behavior in a low-head Francis turbine model operating under various load conditions. The experimental study was conducted on a scaled model of the Francis turbine with a runner diameter of 0.31847 m with a head of 17.66 m and operated at a speed of 950 rpm. The pressure fluctuations ranged their operating points from 70% during part load, 100% at the best efficiency point, to 110% under overload conditions. Pressure field measurements were conducted using miniature-type pressure sensors. Eight sensors were strategically placed at various locations, ranging from the spiral casing inlet to the draft tube. The outcomes facilitated identifying the sources of pressure fluctuations. Substantial pressure oscillation occurs on the model runner, vaneless space, and draft tube cone. The rotating vortex rope was formulated during the part load operation. The results show that the fundamental frequency of pressure fluctuations was 0.375 times the rotational runner frequency and strong pressure fluctuations were observed during part load operation.

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低水头弗朗西斯水轮机模型压力波动的实验研究

本研究强调对在各种负载条件下运行的低水头混流式水轮机模型中稳定流行为的压力波动特性进行实验研究。实验研究在混流式水轮机的比例模型上进行，该模型的转轮直径为 0.31847 米，水头为 17.66 米，转速为 950 转/分钟。压力波动的工作点范围从部分负荷时的 70%、最佳效率点时的 100% 到过载条件下的 110%。使用微型压力传感器进行了压力现场测量。八个传感器被战略性地放置在从蜗壳入口到通风管的不同位置。测量结果有助于确定压力波动的来源。在模型流道、无形空间和牵伸管锥面上出现了大量的压力振荡。在部分负荷运行期间，制定了旋转涡绳。结果表明，压力波动的基频是转轮旋转频率的 0.375 倍，在部分负荷运行期间观察到了强烈的压力波动。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.