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The interaction between the transient cavitating flow and hydrodynamic performance around a pitching hydrofoil

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  • Zhang, Mengjie
  • Huang, Biao
  • Wu, Qin
  • Zhang, Mindi
  • Wang, Guoyu

Abstract

The interaction between the unsteady cavitating flow and hydrodynamic performance around a pitching Clark-Y hydrofoil is investigated experimentally and numerically. The experiments were conducted in the looped cavitation tunnel, and the cavitation patterns are documented by two high-speed digital cameras, and the moment of hydrofoil is measured by the moment sensor. The pitching hydrofoil is controlled from α+ = 10° to α+ = 15° firstly, and goes back to α− = 5° from α+ = 15°, then goes back to α+ = 10° from α− = 5° at Re = 4.4∗105. The upstream velocity U∞ and the cavitation number σ is fixed at 6.3 m/s and 1.38, respectively. And the pitching rate is α˙=40∘/s,α˙∗=0.086. The numerical investigations were performed by solving the incompressible UNRANS equations via the commercial code CFX using the Merkle cavitation model, the coupled k-ω SST turbulence model and γ-Reθ transition model. The predicted cavity patterns and moment coefficients agree well with the experimental results. The results showed there are two distinct cavitation patterns (Multi-scale cloud cavitation and Traveling sheet cavitation). For the Multi-scale cloud cavitation phase (α+ = 10°-α- = 10°), the re-entrant flow is the main factor on the stability of cavitating flow structures, which is responsible for different shedding patterns. According to the breaking position and re-entrant flow thickness, this stage is divided into three different patterns of the cavity development and shedding. For the Traveling sheet cavitation phase (α− = 10°-α+ = 10°), the shedding of cavity mainly results from the interaction of the re-entrant flow and the fluctuation of the gas liquid interface, thus leading to the irregular breaking points. The cavitating flow structure of different phases were further investigated using the LESs, which will be help to identify the dynamic behavior of flow structures effectively.

Suggested Citation

  • Zhang, Mengjie & Huang, Biao & Wu, Qin & Zhang, Mindi & Wang, Guoyu, 2020. "The interaction between the transient cavitating flow and hydrodynamic performance around a pitching hydrofoil," Renewable Energy, Elsevier, vol. 161(C), pages 1276-1291.
  • Handle: RePEc:eee:renene:v:161:y:2020:i:c:p:1276-1291
    DOI: 10.1016/j.renene.2020.07.080
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    1. Zhang, Mengjie & Liu, Taotao & Huang, Biao & Wu, Qin & Wang, Guoyu, 2020. "Hydrodynamic characteristics and flow structures of pitching hydrofoil with special emphasis on the added force effect," Renewable Energy, Elsevier, vol. 157(C), pages 560-573.
    2. Zhang, Mengjie & Wu, Qin & Wang, Guoyu & Huang, Biao & Fu, Xiaoying & Chen, Jie, 2020. "The flow regime and hydrodynamic performance for a pitching hydrofoil," Renewable Energy, Elsevier, vol. 150(C), pages 412-427.
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