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Influence of spear needle eccentricity on jet quality in micro Pelton turbine for power generation

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  • Jung, In Hyuk
  • Kim, Young Soo
  • Shin, Dong Ho
  • Chung, Jin Taek
  • Shin, Youhwan

Abstract

The quality of the jet injected from a nozzle is one of the key factors that affects the performance of Pelton turbines. In this study, for the first time, experiments and numerical simulation were conducted to investigate the effect of the spear needle eccentricity on the jet flow in micro Pelton turbines. Results show that the eccentricity of the spear needle causes jet diffusion under low flow conditions and significantly increases the loss of the spear nozzle (injector). Furthermore, the increase in the eccentricity ratio causes extreme jet separation and jet diffusion, and the loss of the spear nozzle increases by 52% (from 453 W to 688 W) when the eccentricity ratio increases by 6%. Analysis of the results confirmed that the pressure deviation and jet velocity imbalance caused by eccentricity are the primary causes of jet diffusion. Furthermore, the results confirm that the eccentricity of the spear needle in the case of a low-capacity Pelton turbine has a significant effect on the jet quality. Thus, further studies on the eccentricity are required to improve the performance of the Pelton turbine.

Suggested Citation

  • Jung, In Hyuk & Kim, Young Soo & Shin, Dong Ho & Chung, Jin Taek & Shin, Youhwan, 2019. "Influence of spear needle eccentricity on jet quality in micro Pelton turbine for power generation," Energy, Elsevier, vol. 175(C), pages 58-65.
    • Handle: RePEc:eee:energy:v:175:y:2019:i:c:p:58-65
    DOI: 10.1016/j.energy.2019.03.077
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    References listed on IDEAS

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    Cited by:

    1. Xiao, Yexiang & Guo, Bao & Rai, Anant Kumar & Liu, Jie & Liang, Quanwei & Zhang, Jin, 2022. "Analysis of hydro-abrasive erosion in Pelton buckets using a Eulerian-Lagrangian approach," Renewable Energy, Elsevier, vol. 197(C), pages 472-485.
    2. Li, Lihao & Lu, Jiaxing & Gong, Yong & Zhao, Haoyu & Liu, Xiaobing & Zhu, Baoshan, 2024. "Sediment erosion characteristics of Pelton turbine runner: Effects of sediment concentration and diameter," Renewable Energy, Elsevier, vol. 220(C).
    3. Guo, Bao & Xiao, Yexiang & Rai, Anant Kumar & Liang, Quanwei & Liu, Jie, 2021. "Analysis of the air-water-sediment flow behavior in Pelton buckets using a Eulerian-Lagrangian approach," Energy, Elsevier, vol. 218(C).
    4. Guo, Bao & Xiao, Yexiang & Rai, Anant Kumar & Zhang, Jin & Liang, Quanwei, 2020. "Sediment-laden flow and erosion modeling in a Pelton turbine injector," Renewable Energy, Elsevier, vol. 162(C), pages 30-42.

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