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Numerical Study on Auxiliary Propulsion Performance of Foldable Three-Element Wingsail Utilizing Wind Energy

Yongxu Jiang, Chenze Cao, Ting Cui, Hao Yang (yanghao7196@163.com) and Zhengjun Tian
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Yongxu Jiang: Innovation and R&D Department, China Merchants Industry Technology (Shanghai) Co., Ltd., Shanghai 200137, China
Chenze Cao: Innovation and R&D Department, China Merchants Industry Technology (Shanghai) Co., Ltd., Shanghai 200137, China
Ting Cui: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Hao Yang: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhengjun Tian: Innovation and R&D Department, China Merchants Industry Technology (Shanghai) Co., Ltd., Shanghai 200137, China

Energies, 2024, vol. 17, issue 15, 1-19

Abstract: Sail-assisted propulsion is an important energy-saving technology in the shipping industry, and the development of foldable wingsails has recently become a hot topic. This type of sail is usually composed of multiple elements, and its performance at different folding configurations is very sensitive to changes in incoming airflow, which result in practical operational challenges. Therefore, original and optimized three-element wingsails (bare and concave) are modeled and simulated using the unsteady RANS method with the k - ω SST turbulence model. Next, certain key design and structural parameters (such as angle of attack, apparent wind angle, and camber) are employed to characterize the auxiliary propulsion performance, and the differences are explained in combination with the flow field details. The results show that, in the unfolded state, the aerodynamic performance of the concave wingsail is better than that of the bare wingsail, exhibiting higher lift coefficients, lower drag coefficients, and a more stable surface flow. In the fully folded state, wherein both the nose and flap are rotated, the thrust performance of the concave wingsail remains superior. Specifically, at an angle of attack of 8 degrees, the thrust coefficient of the concave wingsail is approximately 23.5% higher than that of the bare wingsail, indicating improved wind energy utilization. The research results are of great significance for engineering applications and subsequent optimization design.

Keywords: wingsail; apparent wind angle; camber; thrust coefficient (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: 2024
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