Numerical Study on the Mechanism of Flow and Cavitation Control by Leading-edge Tubercles on Hydrofoil

被引：0

作者：

Chen, Liu ^{[1
]}

Cao, Lin-Lin ^{[1
]}

Zhao, Guo-Shou ^{[1
]}

Che, Bang-Xiang ^{[1
]}

Wu, Peng ^{[1
]}

Yan, Peng ^{[3
]}

Wu, Da-Zhuan ^{[1
,2
]}

机构：

[1] Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou,310027, China

[2] State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Hangzhou,310027, China

[3] Marine Design & Research Institute of China, Shanghai,200011, China

来源：

Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | 2019年 / 40卷 / 10期

关键词：

Flow structure - Fins (heat exchange) - Axial flow - Biomimetics - Pumps - Angle of attack - Cavitation - Hydrofoils - Vortex flow - Flow control - Tubes (components);

D O I：

暂无

中图分类号：

学科分类号：

摘要：

When the humpback whale swims or rotates rapidly, the irregular tubercles on the leading edge of the fins can induce a certain scale of counter-rotating vortices, which can make the surface flow field around the fins become properly turbulent, and the stall suppressed when under large load conditions and ensure the fins till with good propulsion performance. Previous studies have also shown that such a flow structure has a certain effect on the control of cavitation on hydrofoil. To gain a deep understanding of the mechanism of cavitation control by the leading edge on hydrofoil, and provide valuable references for the anti-cavitation design of the pump blade, firstly the present work numerically investigates the mechanism of the flow structure and cavitation characteristics by leading-edge tubercles on hydrofoil on NACA 63(4)-021 hydrofoils. The evolution trend of the vortices with the change of flow conditions is consistent with the existing reference data, and the results show that the flow structure significantly inhibits the chordwise and spanwise development of cavitation. Since one of the primary applications of the biomimetic tubercles is a thicker aerodynamic airfoil, while the blade profile in the axial flow pump application is generally a thin airfoil profile with a small angle and a high flow velocity, the numerical study on the mechanism of cavitation on a thinner hydrofoil of an axial flow pump is carried out at a small angle of attack, which also shows that the vortices induced by leading-edge tubercles are also effective to control cavitation on the thin hydrofoil. © 2019, Science Press. All right reserved.

引用

页码：2291 / 2298