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首页> 外文期刊>Renewable energy >Experimental investigation of hysteresis on pump performance characteristics of a model pump-turbine with different guide vane openings
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Experimental investigation of hysteresis on pump performance characteristics of a model pump-turbine with different guide vane openings

机译：迟滞对具有不同导叶开口的模型水泵水轮机性能的实验研究

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摘要

Hysteresis loops on the performance curves in the hump region of pump-turbines have been identified in previous studies, which significantly enlarged the unstable operational region, leading to unreasonable selections in the safety margin in the head. In order to understand the formation mechanism of the hysteresis characteristic, and its dependence on the guide vane opening, experiments on both the performance characteristics and the pressure fluctuations were carried out in a low specific speed (n(q) = 36.1 min(-1)) model pump-turbine. Hysteresis phenomena with three guide vane openings (13 mm, 19 mm and 25 mm) were confirmed. Analyses through the Euler theory indicate that all hysteresis characteristics are originated from combining effects from the decrease in the Euler head and the increase in the hydraulic loss. Detailed analysis reveals that the hydraulic loss contributes the most to the generation of the hysteresis characteristic. Based the analysis of pressure fluctuations, it is obtained that the high hydraulic loss is related to the low frequency pressure fluctuations, originating from different sources under different guide vane openings. At small guide vane openings, low frequency components (between 0.04 and 0.15 times rotational frequency) originate from rotating flow separation in the vaneless space, while at large guide vane openings, they result from complex vortices in the guide vanes. Furthermore, different initial operating conditions lead to different magnitudes of low frequency components, which in turn contribute to the hysteresis characteristic. The present study provides a sound criterion for the selection of the safety margin in the head, with respect to the hump characteristic of pump-turbines in engineering applications. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在以前的研究中，已经确定了水泵水轮机驼峰区域性能曲线上的磁滞回线，这大大扩大了不稳定的工作区域，导致水头安全裕度的选择不合理。为了了解磁滞特性的形成机理及其对导叶开口的依赖性，在低比速（n（q）= 36.1 min（-1）的条件下进行了性能特性和压力波动的实验。 ））模型水轮机。确认了三个导叶开口（13 mm，19 mm和25 mm）的磁滞现象。通过欧拉理论进行的分析表明，所有滞后特性均源于欧拉头的减小和水力损失增加的综合影响。详细分析表明，水力损失对滞后特性的产生贡献最大。通过对压力波动的分析，可以发现高水力损失与低频压力波动有关，其源于不同导叶开口下的不同来源。在较小的导向叶片开口处，低频分量（介于0.04到0.15倍的旋转频率之间）源自无叶片空间中的旋转流分离，而在较大的导向叶片开口处，它们是由导向叶片中的复杂涡旋产生的。此外，不同的初始操作条件会导致低频分量的大小不同，进而导致磁滞特性。相对于工程应用中的水轮机的驼峰特性，本研究为选择水头的安全裕度提供了合理的标准。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Renewable energy》 |2020年第4期|652-663|共12页
  • 作者

  • 作者单位

    Xian Univ Technol State Key Lab Ecohydraul Northwest Arid Reg Xian Peoples R China|Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Tsinghua Univ Dept Energy & Power Engn State Key Lab Hydro Sci & Engn Beijing 100084 Peoples R China;

    Xihua Univ Key Lab Fluid Machinery & Engn Res Base Sichuan P Chengdu 610039 Peoples R China;

    Harbin Inst Large Elect Machinery State Key Lab Hydropower Equipment Harbin 150040 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pump-turbine; Hysteresis characteristic; Hump region; Pressure fluctuation; Experimental investigation;

    机译：水轮机磁滞特性;驼峰区域压力波动;实验研究;

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