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首页> 外文期刊>Renewable energy >Improving the cavitation inception performance of a reversible pumpturbine in pump mode by blade profile redesign: Design concept, method and applications
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Improving the cavitation inception performance of a reversible pumpturbine in pump mode by blade profile redesign: Design concept, method and applications

机译：通过叶片轮廓的重新设计来提高可逆式水轮机在水泵模式下的汽蚀开始性能：设计理念，方法和应用

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摘要

In reversible pump-turbines at pump mode, local flow separation on the leading-edge overlaps the impeller's low-pressure side and causes a sudden pressure-drop. Hence, cavitation easily incepts on leading-edge especially at off-design conditions. To solve this cavitation problem, a NACA0006 profile was used as a simplified model of pump-turbine impeller blade to understand the cavitation inception mechanism. Numerical results indicate multiple favorable-pressure-gradients, which were caused by the quickly-varied geometry, on the hydrofoil surface. The minimum pressure occurs in one of these gradients' region and usually locates around leading-edge because of the quickly-varied geometry of leading-edge arc. Then, Diffusion-angle Integral design method was developed to design the blade leading-edge shape. It has only three design parameters by effective geometry deconstruction. Based on orthogonal test, the reasonable values of design parameters can be determined. With optimal design parameters, the NACA0006 foil and pump-turbine impeller blade were completely redesigned and improved. The inception cavitation number of the redesigned foil was obviously reduced especially at large incidence angles. The redesigned pump-turbine also has a reduced inception cavitation number and delayed cavitation inception especially at off-design conditions. The design concept, method and application in this study provide useful reference for anti-inception-cavitation design of turbomachinery blades. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在处于泵模式的可逆式水泵水轮机中，前缘处的局部流分离与叶轮的低压侧重叠，并导致突然的压降。因此，特别是在非设计条件下，气穴现象很容易出现在前沿。为了解决该气蚀问题，将NACA0006型材用作泵-涡轮叶轮叶片的简化模型，以了解气蚀发生机理。数值结果表明，在翼型表面上存在多个由快速变化的几何形状引起的有利压力梯度。最小压力发生在这些梯度的区域之一中，并且通常由于前沿电弧几何形状的快速变化而位于前沿周围。然后，开发了扩散角整体设计方法来设计叶片前缘形状。通过有效的几何构形，它只有三个设计参数。基于正交试验，可以确定设计参数的合理值。通过优化的设计参数，对NACA0006铝箔和水泵涡轮叶轮叶片进行了完全重新设计和改进。重新设计的箔片的初始空化数明显减少，尤其是在大入射角下。重新设计的水泵水轮机还减少了初始气蚀次数，并且延迟了气蚀现象，特别是在非设计条件下。本研究的设计思想，方法和应用为涡轮机械叶片的防空化设计提供了有益的参考。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Renewable energy》 |2019年第4期|325-342|共18页
  • 作者

    Tao Ran; Xiao Ruofu; Wang Fujun; Liu Weichao;

  • 作者单位

    China Agr Univ, Beijing Engn Res Ctr Safety & Energy Saving Techn, Beijing, Peoples R China;

    China Agr Univ, Beijing Engn Res Ctr Safety & Energy Saving Techn, Beijing, Peoples R China;

    China Agr Univ, Beijing Engn Res Ctr Safety & Energy Saving Techn, Beijing, Peoples R China;

    Dongfang Elect Machinery Co Ltd, Deyang, 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

    Cavitation inception; Leading-edge shape; Anti-Cavitation design; Hydrofoil; Pump-turbine;

    机译：空化开始;前沿形状;抗空化设计;水翼;水泵水轮机;

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