With the development of large-scale tidal current turbines and the increase in tidal current velocity, the possibility of cavitation increases. Furthermore, unsteady cavitation is a complicated multiphase flow that causes power degradation of tidal current turbine blade. There has been no comprehensive investigation of it so far. In this study, the blade captured power is obtained at different cavitation numbers using the Schnerr–Sauer cavitation model. The numerical uncertainty for the mesh and the time step is calculated by the grid convergence index method. It has been shown that, when the cavitation number is 5 and 2, cavitation has no effect on the blade power. With the decrease in the cavitation number, the rise in cavitation intensity occurs when the vapor distribution area stretches from the blade tip to the blade root and from the leading edge to the trailing edge, respectively. With a fall in cavitation number to 1.3, the vapor volume fraction rises, and the viscosity of the mixed phase reduces, resulting in a reduction in viscous power. When the cavitation number is 0.8, there exists a larger region in which an absolute value of minimum pressure coefficient is less than the cavitation number, a smaller blade load is present, and the pressure difference power is substantially decreased. Because of the huge inverse pressure gradient created by cavitation, the negative pressure difference power is generated, resulting in a decline of the blade power coefficient to 14%, when the cavitation number is 0.5.
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January 2023
Research Article|
January 05 2023
Effect of cavitation evolution on power characteristics of tidal current turbine
Special Collection:
Cavitation
Yanjing Gao (高艳婧);
Yanjing Gao (高艳婧)
(Formal analysis, Methodology, Writing – original draft)
1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University
, Zheda Rd. 38, 310027 Hangzhou, People's Republic of China
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Hongwei Liu (刘宏伟)
;
Hongwei Liu (刘宏伟)
a)
(Funding acquisition, Supervision, Writing – review & editing)
1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University
, Zheda Rd. 38, 310027 Hangzhou, People's Republic of China
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Guanzhu Guo (郭关柱)
;
Guanzhu Guo (郭关柱)
a)
(Supervision, Writing – review & editing)
2
College of Mechanical and Electrical Engineering, Yunnan Agricultural University
, Kunming Yunnan 650201, China
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Yonggang Lin (林勇刚);
Yonggang Lin (林勇刚)
(Funding acquisition, Supervision, Writing – review & editing)
1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University
, Zheda Rd. 38, 310027 Hangzhou, People's Republic of China
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Yajing Gu (顾亚京);
Yajing Gu (顾亚京)
(Conceptualization, Funding acquisition, Validation)
1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University
, Zheda Rd. 38, 310027 Hangzhou, People's Republic of China
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Yiming Ni (倪艺铭)
Yiming Ni (倪艺铭)
(Data curation, Visualization)
1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University
, Zheda Rd. 38, 310027 Hangzhou, People's Republic of China
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Note: This paper is part of the special topic, Cavitation.
Physics of Fluids 35, 013307 (2023)
Article history
Received:
October 25 2022
Accepted:
December 07 2022
Citation
Yanjing Gao, Hongwei Liu, Guanzhu Guo, Yonggang Lin, Yajing Gu, Yiming Ni; Effect of cavitation evolution on power characteristics of tidal current turbine. Physics of Fluids 1 January 2023; 35 (1): 013307. https://doi.org/10.1063/5.0131906
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