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Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine

Author

Listed:
  • Bao Ngoc Tran

    (Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea)

  • Haechang Jeong

    (Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea)

  • Jun-Ho Kim

    (Division of Marine Mechatronics, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea)

  • Jin-Soon Park

    (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Busan 49111, Korea)

  • Changjo Yang

    (Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea)

Abstract

Unavoidable tip clearance between blade tip and casing shroud plays an important role in the performance and characteristics of a tidal propeller turbine. In this work, the tip-leakage vortex (TLV) induced in the end-wall region was numerically illustrated by using the shear-stress transport (SST) k–ω turbulence model at various flow conditions and different tip-clearance sizes (TCSs). The swirling strength criterion was employed to visualize the tip-leakage vortex trajectory and investigate vortex evolution according to clearance size change. Although TLV occurs in both design and off-design conditions, vortex intensity develops strongly under excess flow rate with increased tip gap. The extreme influence of TCS on the turbine’s generated power and efficiency was predicted in steady simulations for four TCS cases, namely, δ = 0%, 0.25%, 0.5%, and 0.75%. With the extension of the tip gap, turbine performance was drastically reduced because of vigorous turbulent leakage flow combined with considerable volumetric loss. The effect of TCS on pressure fluctuation intensity were also explored on the basis of the transient simulation statistic. Maximal pressure variation amplitude and dominant frequency were presented in spectrum analysis utilizing fast Fourier transform.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4055-:d:395015
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    References listed on IDEAS

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    1. Yabin Liu & Lei Tan & Yue Hao & Yun Xu, 2017. "Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes," Energies, MDPI, vol. 10(2), pages 1-15, February.
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    3. 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.
    4. Samora, Irene & Hasmatuchi, Vlad & Münch-Alligné, Cécile & Franca, Mário J. & Schleiss, Anton J. & Ramos, Helena M., 2016. "Experimental characterization of a five blade tubular propeller turbine for pipe inline installation," Renewable Energy, Elsevier, vol. 95(C), pages 356-366.
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    Cited by:

    1. Anatoliy M. Pavlenko & Hanna Koshlak, 2021. "Application of Thermal and Cavitation Effects for Heat and Mass Transfer Process Intensification in Multicomponent Liquid Media," Energies, MDPI, vol. 14(23), pages 1-19, November.
    2. Zhen Qin & Xiaoran Tang & Yu-Ting Wu & Sung-Ki Lyu, 2022. "Advancement of Tidal Current Generation Technology in Recent Years: A Review," Energies, MDPI, vol. 15(21), pages 1-18, October.
    3. Satou, Eiichi & Ikeda, Toshihiko & Uchiyama, Tomomi & Okayama, Tomoko & Miyazawa, Tomoaki & Takamure, Kotaro & Tsunashima, Daisuke, 2022. "Development of an undershot cross-flow hydraulic turbine resistant to snow and ice masses flowing in an installation canal," Renewable Energy, Elsevier, vol. 200(C), pages 146-153.

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