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Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process

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

Abstract

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.

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  • Chen, Huixiang & Zhou, Daqing & Kan, Kan & Guo, Junxun & Zheng, Yuan & Binama, Maxime & Xu, Zhe & Feng, Jiangang, 2021. "Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process," Renewable Energy, Elsevier, vol. 165(P2), pages 28-41.
    • Handle: RePEc:eee:renene:v:165:y:2021:i:p2:p:28-41
    DOI: 10.1016/j.renene.2020.11.064
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    References listed on IDEAS

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    5. Huixiang Chen & Daqing Zhou & Yuan Zheng & Shengwen Jiang & An Yu & You Guo, 2018. "Load Rejection Transient Process Simulation of a Kaplan Turbine Model by Co-Adjusting Guide Vanes and Runner Blades," Energies, MDPI, vol. 11(12), pages 1-18, November.
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    Cited by:

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    2. Feng, Jianjun & Ge, Zhenguo & Zhu, Guojun & Tian, Diyang & Wu, Guangkuan & Luo, Xingqi, 2023. "Runaway characteristics of a prototype bulb turbine considering upper and lower reservoirs based on lattice Boltzmann method," Renewable Energy, Elsevier, vol. 202(C), pages 773-783.
    3. Binama, Maxime & Kan, Kan & Chen, Hui-Xiang & Zheng, Yuan & Zhou, Daqing & Su, Wen-Tao & Muhirwa, Alexis & Ntayomba, James, 2021. "Flow instability transferability characteristics within a reversible pump turbine (RPT) under large guide vane opening (GVO)," Renewable Energy, Elsevier, vol. 179(C), pages 285-307.
    4. Liu, Baonan & Zhou, Jianzhong & Xu, Yanhe & Lai, Xinjie & Shi, Yousong & Li, Mengyao, 2022. "An optimization decision-making framework for the optimal operation strategy of pumped storage hydropower system under extreme conditions," Renewable Energy, Elsevier, vol. 182(C), pages 254-273.
    5. Zheming Tong & Zhongqin Yang & Qing Huang & Qiang Yao, 2022. "Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition," Energies, MDPI, vol. 15(5), pages 1-17, March.

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