Investigation of Water Injection Influence on Cloud Cavitating Vortical Flow for a NACA66 (MOD) Hydrofoil

Zhijian Li, Wei Wang, Xiang Ji and Xiaofang Wang
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Zhijian Li: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Wei Wang: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Xiang Ji: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Xiaofang Wang: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Energies, 2021, vol. 14, issue 18, 1-21

Abstract: Re-entrant jet causes cloud cavitation shedding, and cavitating vortical flow results in flow field instability. In the present work, a method of water injection is proposed to hinder re-entrant jet and suppress vortex in cloud cavitating flow of a NACA66 (MOD) hydrofoil (Re = 5.1 × 10 5 , σ = 0.83). A combination of filter-based density corrected turbulence model (FBDCM) with the Zwart–Gerber–Belamri cavitation model (ZGB) is adopted to obtain the transient flow characteristics while vortex structures are identified by Q criterion & λ 2 criterion. Results demonstrate that the injected water flow reduces the range of the low-pressure zone below 1940 Pa on the suction surface by 54.76%. Vortex structures are observed both inside the attached and shedding cavitation, and the water injection shrinks the vortex region. The water injection successfully blocks the re-entrant jet by generating a favorable pressure gradient (FPG) and effectively weakens the re-entrant jet intensity by 46.98%. The water injection shrinks the vortex distribution area near the hydrofoil suction surface, which makes the flow in the boundary layer more stable. From an energy transfer perspective, the water injection supplies energy to the near-wall flow, and hence keeps the steadiness of the flow field.

Keywords: cloud cavitation; vortical flow; water injection; re-entrant jet; flow control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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