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Physic of secondary flow phenomenon in distributor and bifurcation pipe of Pelton turbine

Author

Listed:
  • Han, L.
  • Duan, X.L.
  • Gong, R.Z.
  • Zhang, G.F.
  • Wang, H.J.
  • Wei, X.Z.

Abstract

In Pelton turbine, two-phase homogeneous model is the fundamental base to investigate the flow inside the turbine. Meanwhile, flow pattern in section of the distributor and bifurcation pipe produces the secondary flow which influences the shape of the jet downstream 6 nozzles. This paper numerically investigated the dynamic process using CFX commercial code under different operating conditions. Volume of Fluid(VOF) model was used to capture the air/water interface. This work focuses on the jet bifurcation problem which can seriously influence the Pelton turbine performance and furthermore it is not yet investigated in hydraulic research. Results indicate that the shape of the distributor induces the secondary flow and Dean vortex structure which are symmetric with the central horizontal plane of the pipe and nozzles. On the other hand, this sequence of vortex develops and transits along the flow and finally affects the shape of jet. Effect of secondary flow in the distributor stretches the jet flow in vertical direction and compress it in horizontal direction. Meanwhile, bifurcating phenomenon is observed outside the nozzle which is also obtained in classical experimentations. This study reveals that the secondary flow is important to be taken into consideration to optimize the performance of Pelton turbine.

Suggested Citation

  • Han, L. & Duan, X.L. & Gong, R.Z. & Zhang, G.F. & Wang, H.J. & Wei, X.Z., 2019. "Physic of secondary flow phenomenon in distributor and bifurcation pipe of Pelton turbine," Renewable Energy, Elsevier, vol. 131(C), pages 159-167.
    • Handle: RePEc:eee:renene:v:131:y:2019:i:c:p:159-167
    DOI: 10.1016/j.renene.2018.06.116
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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. 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.
    3. Alimirzazadeh, Siamak & Kumashiro, Takashi & Leguizamón, Sebastián & Jahanbakhsh, Ebrahim & Maertens, Audrey & Vessaz, Christian & Tani, Kiyohito & Avellan, François, 2020. "GPU-accelerated numerical analysis of jet interference in a six-jet Pelton turbine using Finite Volume Particle Method," Renewable Energy, Elsevier, vol. 148(C), pages 234-246.
    4. Han, L. & Wang, Y. & Zhang, G.F. & Wei, X.Z., 2021. "The particle induced energy loss mechanism of Pelton turbine," Renewable Energy, Elsevier, vol. 173(C), pages 237-248.
    5. Han, L. & Zhang, G.F. & Wang, Y. & Wei, X.Z., 2021. "Investigation of erosion influence in distribution system and nozzle structure of pelton turbine," Renewable Energy, Elsevier, vol. 178(C), pages 1119-1128.
    6. Franz Josef Johann Hahn & Anton Maly & Bernhard Semlitsch & Christian Bauer, 2023. "Numerical Investigation of Pelton Turbine Distributor Systems with Axial Inflow," Energies, MDPI, vol. 16(6), pages 1-20, March.

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