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Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed

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  • Jinbao Chen

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Yang Zheng

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Lihong Zhang

    (College of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Xiaoyu Chen

    (Nuclear Power Plants and Renewable Energy Sources Department, Ural Federal University, 620002 Yekaterinburg, Russia)

  • Dong Liu

    (College of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Zhihuai Xiao

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

Abstract

The hydraulic turbine in turbine mode (HTTM) with an ultra-low specific speed (HTTM-ULSS) has the advantages of a simplified structure, high efficiency, and good stability and has great application value in the industry. However, the influence of the runner inlet diameter ( D 1 ) on the performance of HTTM-ULSS has not yet been fully studied. Therefore, the three-dimensional models of Francis runners were established in the ultra-low specific speed range by examining D 1 = 0.49 m, 0.5 m, and 0.51 m, and the two-stage hydraulic turbine models were constructed with flow passage components. Then, internal flow and energy characteristics were calculated using Fluent 16.0 software. Further, the influence of D 1 on HTTM performance was studied by comparing numerical simulation results. The results show that the water head of the HTTM-ULSS can reach 540.87 m when D 1 = 0.51 m, showing its powerful ability to recover the pressure energy in high-pressure water. Moreover, the head and efficiency are closely related to D 1 ; when D 1 increases, the circulation at the runner inlet increases, resulting in an enhancement in the ability to recover the water head and decreases in efficiency and in the operating range of the high-efficiency zone; with D 1 increasing, the flow pattern inside the runner becomes better, but the high-pressure area of the blade increases. When selecting the D 1 , attention should not only be paid to the ability to recover the water head but also to the pressure of the runner blades and the internal water flow pattern.

Suggested Citation

  • Jinbao Chen & Yang Zheng & Lihong Zhang & Xiaoyu Chen & Dong Liu & Zhihuai Xiao, 2023. "Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed," Energies, MDPI, vol. 16(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:20:p:7086-:d:1259518
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    References listed on IDEAS

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    1. Jun Yang & Tao Peng & Gang Xu & Wenli Hu & Huazhou Zhong & Xiaohua Liu, 2023. "A Study and Optimization of the Unsteady Flow Characteristics in the Last Stage Impeller of a Small-Scale Multi-Stage Hydraulic Turbine," Energies, MDPI, vol. 17(1), pages 1-20, December.

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