Research on the technical improvement of the turbine runner of a power station based on improving stability

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-09-24 DOI:10.1002/ese3.1898
Shenhui Li, Bing Yao, Jiayang Pang, Demin Liu, Dan Chengmei, Dengyun Jiang, Haiqi Wang, Yuanyuan Gang, Huan Cheng, Xiaobing Liu
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Abstract

In view of problems such as the narrow efficiency area, large hydraulic vibration area, pressure pulsation, and serious sediment wear of turbines at the Futang hydropower station, the technical transformation of turbine runners was carried out by modifying the blade shape and increasing the blade thickness, and a combination of numerical simulations based on shear stress transport k–ω turbulence model and tests was adopted to improve the operational stability of power station units. Calculation and testing demonstrate an enlargement of the high-efficiency zone. Specifically, the optimal efficiency of the runner increases by 0.37%, while the rated efficiency rises by 0.19%. Significant reductions are observed in pressure pulsation within the draft tube and vaneless area decrease of approximately 50%. There is a high-frequency pressure pulsation in the vaneless zone and the runner under low-load conditions, and the influence of dynamic and static interference gradually weakens with the increase of opening. The draft tube is prone to eccentric vortex bands under partial working conditions, which causes the unit to be affected by low-frequency pulsation. This optimization also leads to a notable decrease in runner blade wear, with the maximum sand and water velocity reduced from 45 to 40 m/s, resulting in a 30% reduction in sand wear. Moreover, there is a substantial enhancement in the runner's stiffness, with the thickness of the blade near the high stress area of the upper crown and lower ring increasing by over 50%, and the weight of each individual blade increasing by more than 50%. These research findings validate that modifying the runner blade effectively improves flow patterns, reduces eddy current generation, minimizes pressure pulsation, widens the high-efficiency zone, decreases wear, and enhances the operational stability of the unit. The technical transformation method and research results of this study have important guiding significance for similar technical transformation of other power stations

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基于提高稳定性的电站涡轮转轮技术改进研究
针对富塘水电站水轮机高效区狭窄、水力振动区大、压力脉动、泥沙磨损严重等问题,通过修改叶片形状、增加叶片厚度等方法对水轮机转轮进行了技术改造,并采用基于剪应力输运 k-ω 湍流模型的数值模拟与试验相结合的方法,提高了电站机组的运行稳定性。计算和试验证明了高效区的扩大。具体而言,转轮的最佳效率提高了 0.37%,而额定效率提高了 0.19%。引流管内的压力脉动显著降低,无气泡面积减少了约 50%。低负荷条件下,无叶片区和流道内存在高频压力脉动,随着开度的增加,动静干扰的影响逐渐减弱。牵伸管在部分工况下容易产生偏心涡带,导致机组受到低频脉动的影响。这一优化还显著降低了转轮叶片的磨损,最大砂水流速从 45 米/秒降至 40 米/秒,使砂子磨损降低了 30%。此外,转轮的刚度也得到了大幅提高,靠近上冠和下环高应力区的叶片厚度增加了 50%以上,每个叶片的重量增加了 50%以上。这些研究结果验证了对转轮叶片的改造能有效改善流态、减少涡流产生、减少压力脉动、扩大高效区、减少磨损、提高机组运行稳定性。本研究的技术改造方法和研究成果对其他电站的类似技术改造具有重要的指导意义
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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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