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| Energy loss characteristics of pump turbine runner based on entropy generation and vorticity |
| LI Zhenggui1, WANG Dong1*, LI Deyou2, LI Qifei3 |
| 1. Provincial Key Laboratory of Fluid and Mechanical Engineering, Xihua University, Chengdu, Sichuan 610000, China; 2. School of Energy Science and Power Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150000, China; 3. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730000, China |
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Abstract Pump turbine is the core component of power grid regulation and energy storage conversion. Frequent changes in the opening of the active guide vane during operation will lead to instability of the unit, and its instability mechanism remains unclear. Based on entropy generation theory and vorticity analysis, the method of combining numerical simulation and experimental tests to analyze the energy loss characteristics of pump turbine under three working conditions of low flow, high efficiency and large flow were adopted. The research show that: with the increase in the opening of the active guide vane, the vortex value in the runner region increases, the entropy production in the high vortex value distribution region and the main flow region initially decreases and then increases, and the entropy production rate in the wall region increases. Variation law of energy loss is positively correlated with the variation law of flow disorder degree, and the vortex flow as well as impact, friction and other pheno-mena in the runner region are the important causes of energy loss. The experimental results of the same working condition model are similar to the numerical simulation results, which provides an important basis for the design and efficiency improvement of pump turbines.
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Received: 01 November 2021
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