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Effect of Tip Clearance on Flow Field and Heat Transfer Characteristics in a Large Meridional Expansion Turbine

Author

Listed:
  • Fusheng Meng

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Qun Zheng

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Jie Gao

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Weiliang Fu

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

Abstract

The large meridional expansion turbine stator leads to complex secondary flows and heat transfer characteristics in the blade endwall region, while the upstream tip clearance leakage flow of the rotor makes it more complex in flow and heat transfer. The influence of the upstream rotor tip clearance on the large meridian expansion stator is worth studying. The flow and heat transfer characteristics of the downstream large meridional expansion turbine stator were studied by comparing the tip leakage flow of 1.5-stage shrouded and unshrouded turbines using a three-dimensional Reynolds-Averaged Navier-Stokes (RANS) solver for viscous turbulent flows. Validation studies were performed to investigate the aerodynamics and heat transfer prediction ability of the shear stress transport (SST) turbulence model. The influence of different tip clearances of the rotor including unshrouded blade heights of 0%, 1% and 5% and a 1% shrouded blade height were investigated through numerical simulation. The results showed that the upper passage vortex separation was more serious and the separation, and attachment point of horseshoe vortex in the pressure side were significantly more advanced than that of non-expansion turbines. The tip leakage vortex obviously increased the negative incidence angle at the downstream inlet. Furthermore, the strength of the high heat transfer zone on the suction surface of the downstream stator was significantly increased, while that of the shrouded rotor decreased.

Suggested Citation

  • Fusheng Meng & Qun Zheng & Jie Gao & Weiliang Fu, 2019. "Effect of Tip Clearance on Flow Field and Heat Transfer Characteristics in a Large Meridional Expansion Turbine," Energies, MDPI, vol. 12(1), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:1:p:162-:d:194846
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    References listed on IDEAS

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    1. Ducoin, A. & Shadloo, M.S. & Roy, S., 2017. "Direct Numerical Simulation of flow instabilities over Savonius style wind turbine blades," Renewable Energy, Elsevier, vol. 105(C), pages 374-385.
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    Cited by:

    1. Bao Ngoc Tran & Haechang Jeong & Jun-Ho Kim & Jin-Soon Park & Changjo Yang, 2020. "Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine," Energies, MDPI, vol. 13(16), pages 1-18, August.
    2. Fusheng Meng & Qun Zheng & Jian Zhang, 2019. "Effects of Blade Fillet Structures on Flow Field and Surface Heat Transfer in a Large Meridional Expansion Turbine," Energies, MDPI, vol. 12(15), pages 1-19, August.
    3. Nishan Jain & Luis Bravo & Dokyun Kim & Muthuvel Murugan & Anindya Ghoshal & Frank Ham & Alison Flatau, 2020. "Massively Parallel Large Eddy Simulation of Rotating Turbomachinery for Variable Speed Gas Turbine Engine Operation," Energies, MDPI, vol. 13(3), pages 1-19, February.

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