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首页> 外文期刊>Renewable energy >Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process
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Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process

机译：负载抑制过程中共闭导叶片和灯泡涡轮机的旋流器叶片期间的瞬态特性

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摘要

The transient characteristics associated with the machine load rejection process are investigated due to its close relationship with hydraulic facilities' safety in low-head tubular turbines, especially in double-regulated bulb turbine. Load-rejection transient characteristics of a double regulated bulb turbine during the co-closing guide vanes (GVs) and runner blades (RBs) procedure were numerically and experimentally studied in this paper. The co-adjusting of GVs and RBs is realized through the usage of dynamic mesh technology. During the process, the speed is augmented by 33.9% by the time it reaches its peak value, where the corresponding maximum negative axial force is 43% of the initial value. The three-dimensional (3D) unsteady numerical simulation method reveals that severe impact of backflow from RBs causes significant fluctuation of torque and axial force during the co-closing procedure. A low-pressure vortex rope is also cut off by gravity-dominant pressure distribution, which leads to hydraulic instability and complex flow structure. The system performance characteristics have been obtained through experimental testing, where the dynamic instability during the co-closing procedure has been showcased. This article presents a novel prediction model and a foundations for further transient characteristics studies and prediction for turbine system with adjustable RBs and GVs. (C) 2020 Elsevier Ltd. All rights reserved.y
机译：由于其与低头管式涡轮机中的液压设施安全性密切相关，特别是在双调节灯泡涡轮机中，研究了与机器负载抑制过程相关的瞬态特性。在本文中，在数值和实验研究了在共关闭导向叶片（GVS）和转轮叶片（RBS）过程中的双调节电灯泡涡轮机的负载抑制瞬态特性。通过使用动态网格技术实现GVS和RBS的共同调整。在此过程中，随着达到其峰值的时间增加了33.9％的速度，其中相应的最大负轴向力是初始值的43％。三维（3D）不稳定数值模拟方法显示，在rbs中，回流的严重影响在共闭过程中导致扭矩和轴向力的显着波动。低压涡旋绳索也通过重力 - 主压力分布切断，这导致液压不稳定和复杂的流动结构。通过实验测试获得了系统性能特征，其中展示了共闭过程中的动态不稳定性。本文介绍了一种新的预测模型，以及用于具有可调节RB和GV的涡轮系统的进一步瞬态特征研究和预测的基础。 （c）2020 elestvier有限公司版权所有.Y

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  • 来源
    《Renewable energy》 |2021年第2期|28-41|共14页
  • 作者

    Chen Huixiang; Zhou Daqing; Kan Kan; Guo Junxun; Zheng Yuan; Binama Maxime; Xu Zhe; Feng Jiangang;

  • 作者单位

    Hohai Univ Coll Agr Sci & Engn Nanjing 210098 Peoples R China;

    Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China;

    Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China;

    Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China;

    Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China;

    Hohai Univ Coll Water Conservancy & Hydropower Engn Nanjing 210098 Peoples R China;

    Hohai Univ Coll Water Conservancy & Hydropower Engn Nanjing 210098 Peoples R China;

    Hohai Univ Coll Agr Sci & Engn Nanjing 210098 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

    Double-regulated bulb turbine; Transient characteristics; Numerical simulation; Load rejection; Dynamic mesh;

    机译：双管灯泡涡轮机;瞬态特征;数值模拟;负荷抑制;动态网格;

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