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Influence of the clearance flow on the load rejection process in a pump-turbine

机译：间隙流量对水轮机甩负荷过程的影响

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摘要

The clearance flow between the runner and the stationary parts greatly effects the efficiency and the hydraulic thrust of pump-turbines. Especially in the load rejection process, the clearance flow of the runner is more important to accurately predict the hydraulic torque on the runner and the variation of the rotational speed. However, the clearance flow was generally neglected in the most previous studies. To investigate the influence of the clearance flow on the simulation of load rejection process, three dimensional simulations were carried out in this paper with and without considering the clearance flow of the runner. To simulate transient characteristic of the boundary conditions, the unsteady total pressure and static pressure boundary conditions were determined at the spiral casing inlet and draft tube outlet using the user defined function. The method of coupling the rigid body motion with the water flow in the pump-turbine was adopted to predict the variation of the rotational speed. Dynamic mesh technology was used to simulate the dynamic closing process of the guide vanes. Based on the available experimental data, the numerical simulation results with and without considering the clearance flow of the runner were compared and analyzed. The results indicate that the accurate simulations of the fluctuating performance characteristics and the unsteady vortex flows in the pump-turbine are significantly influenced by the clearance flow between the runner and the stationary parts during the load rejection transient process. Moreover, the closer to the small discharge conditions, the influence of the clearance flow is more severe. Therefore, the shunt and impact action of the clearance flow to unsteady main flow in pump-turbines should be considered during the simulation of the load rejection transient process. (C) 2018 Elsevier Ltd. All rights reserved.
机译：转轮和固定部件之间的间隙流动极大地影响了泵涡轮的效率和水力推力。特别是在甩负荷过程中，转轮的游隙流量对于准确预测转轮上的液压扭矩和转速变化更为重要。但是，在大多数以前的研究中，通畅流通常被忽略。为了研究间隙流量对甩负荷过程模拟的影响，本文在不考虑转轮间隙流量的情况下进行了三维模拟。为了模拟边界条件的瞬态特性，使用用户定义的函数在螺旋套管入口和引流管出口确定了不稳定的总压力和静压力边界条件。采用将刚体运动与水轮机中的水流耦合的方法来预测转速的变化。动态网格技术用于模拟导叶的动态闭合过程。根据现有的实验数据，对不考虑流道间隙流量的数值模拟结果进行了比较和分析。结果表明，在甩负荷瞬态过程中，转轮和静止零件之间的游隙流动会显着影响水轮机中波动性能特性和不稳定涡流的精确模拟。而且，越接近小排出条件，间隙流的影响就越严重。因此，在模拟甩负荷瞬态过程中，应考虑间隙流对水轮机不稳定流量的分流和冲击作用。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Renewable energy》 |2018年第11期|310-321|共12页
  • 作者

    Fu Xiaolong; Li Deyou; Wang Hongjie; Zhang Guanghui; Li Zhenggui; Wei Xianzhu;

  • 作者单位

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

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

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

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

    Xihua Univ, Key Lab Fluid & Power Machinery, Minist Educ, Chengdu 610039, Sichuan, Peoples R China;

    Harbin Inst Large Elect Machinery, State Key Lab Hydropower Equipment, Harbin 150040, Heilongjiang, 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; Load rejection process; Clearance flow; Fluctuating performance characteristics; Unsteady vortex flow;

    机译：水泵水轮机;甩负荷过程;净空流量;波动特性;不稳定涡流;

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