Transient characteristics analysis in variable-speed process of pump-turbine based on rothalpy change and vortex method

IF 7.1 2区工程技术 Q1 ENERGY & FUELS

Sustainable Energy Technologies and Assessments Pub Date : 2025-04-01 DOI:10.1016/j.seta.2025.104310

Xingqi Luo , Minjia Chen , Guojun Zhu , Jianjun Feng

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Abstract

Variable-speed (VS) operation enables rapid and flexible power adjustment in pump-turbines (PT), while operational stability during transient processes is critically dependent on internal flow dynamics. Thus, the transient flow field inside the PT during the VS transition process is investigated by numerical simulation. Based on rothalpy change and vortex methods, the changes in energy loss, vortex structure, and pressure pulsation during the VS process with the three openings are investigated. The results show that in the initial stage of the VS condition 1 (VSC1) that corresponds to small guide vane opening condition, the rothalpy change is significant in the vaneless region of the guide vane and the runner flow passage. Moreover, aggregated vortices are observed in the initial stage of VSC1, leading to significant power oscillations with an amplitude reaching 37.2% of the stable output. During the middle and late stages of VSC1, vortex intensity diminishes significantly, leading to the disappearance of oscillations. Increasing the guide vane opening mitigates vortex aggregation in the initial stage of VSC1, resulting in improved power stability.

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基于转速变化和涡旋法的水泵水轮机变速过程暂态特性分析

变速（VS）运行使泵-涡轮机（PT）的功率调节快速灵活，而瞬态过程中的运行稳定性则主要取决于内部流动动力学。因此，我们通过数值模拟研究了 VS 过渡过程中 PT 内部的瞬态流场。基于焓变和涡流方法，研究了三个开口的 VS 过程中能量损失、涡流结构和压力脉动的变化。结果表明，在 VS 条件 1（VSC1）的初始阶段，即小导叶开口条件下，导叶的无叶区域和流道流道中的焓值变化显著。此外，在 VSC1 的初始阶段会观察到聚集的涡流，导致显著的功率振荡，振幅达到稳定输出的 37.2%。在 VSC1 的中后期，涡流强度明显减弱，导致振荡消失。增大导叶开度可减轻 VSC1 初始阶段的涡流聚集，从而提高功率稳定性。

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来源期刊

Sustainable Energy Technologies and Assessments Energy-Renewable Energy, Sustainability and the Environment

CiteScore

12.70

自引率

12.50%

发文量

1091

期刊介绍： Encouraging a transition to a sustainable energy future is imperative for our world. Technologies that enable this shift in various sectors like transportation, heating, and power systems are of utmost importance. Sustainable Energy Technologies and Assessments welcomes papers focusing on a range of aspects and levels of technological advancements in energy generation and utilization. The aim is to reduce the negative environmental impact associated with energy production and consumption, spanning from laboratory experiments to real-world applications in the commercial sector.