LES investigation on the influence of cavitation on the evolution and characteristics of tip leakage vortex

被引：2

作者：

Cheng H. ^{[1
]}

Ji B. ^{[1
]}

Long X. ^{[1
]}

Huai W. ^{[1
]}

机构：

[1] State Key Lab of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan

来源：

Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | 2021年 / 53卷 / 05期

关键词：

Cavitation; Cavitation model; Nuclei; Tip-leakage vortex;

D O I：

10.6052/0459-1879-20-415

中图分类号：

学科分类号：

摘要：

In the present paper, the tip-leakage vortex (TLV) cavitation around a NACA0009 hydrofoil is numerically investigated with large eddy simulation method combined with a new Euler-Lagrangian cavitation model, which takes into account the effect of nuclei on tip-leakage cavitating flow. A satisfying agreement between the numerical and experimental results is obtained. Based on the numerical data, the evolution behavior of TLV cavitation with different gap sizes and its influence on the strength and radius of TLV, the nuclei distribution in the vortex core and the distribution of tangential velocity are discussed in detail. The results show that once cavitation occurs, the intensity of TLV is mainly affected by the evolution behavior of the sheet cavitation, while the tip-leakage cavitating flow has little effect on the strength of TLV. In addition, the results suggest that a smaller gap size will result in a more unstable sheet cavity, and the strength of TLV in turn presents corresponding quasi-periodic fluctuation as influenced by the evolution of the sheet cavitation. As the tip clearance progressively increases, the strength of the sheet cavitation gradually decreases with the reduction of instability, and the intensity of TLV gradually returns to the level without cavitation, together with its fluctuation level. Cavitation has a more significant influence on the nuclei distribution in the vortex core, and its degree of influence depends on the spatial stability of TLV and the intensity of TLV cavitation after the occurrence of cavitation. Moreover, the numerical results obtained by our simulations also indicate that cavitation has a significant influence on the radius of TLV. After cavitation occurs, the radius of TLV increases to a certain extent, and a "rigid body rotation" tangential velocity distribution is formed on the periphery of cavitation region, which is mainly caused by the expansion process induced by cavitation growth and the viscous effect of flow. © 2021, Chinese Journal of Theoretical and Applied Mechanics Press. All right reserved.

引用

页码：1268 / 1287

页数：19

共 43 条

[1]

Zhang DS, Shi WD, Pan DZ, Et al., Numerical and experimental investigation of tip leakage vortex cavitation patterns and mechanisms in an axial flow pump, Journal of Fluids Engineering, 137, 12, (2015)

[2]

Chen LY, Zhang LX, Peng XX, Et al., Influence of water quality on the tip vortex cavitation inception, Physics of Fluids, 31, 2, (2019)

[3]

Zhao Yu, Wang Guoyu, Huang Biao, Et al., Study of turbulent vortex and hydraulic dynamics in transient sheet/cloud cavitating flows, Chinese Journal of Theoretical and Applied Mechanics, 46, 2, pp. 191-200, (2014)

[4]

Wang Yiwei, Huang Chenguang, Du Tezhuan, Et al., Mechanism analysis about cavitation collapse load of underwater vehicles in a vertical launching process, Chinese Journal of Theoretical and Applied Mechanics, 44, 1, pp. 39-48, (2012)

[5]

Sun Shuaihui, Liu Rong, Guo Pengcheng, Et al., Effect of rotational speed on the cavitation characteristics and performance of scroll hydraulic pump, Fluid Machinery, 46, 4, pp. 23-28, (2018)

[6]

Xie Qingmo, Chen Liang, Zhang Guiyong, Et al., Analysis of unsteady cavitation flowover hydrofoil based on dynamic mode decomposition, Chinese Journal of Theoretical and Applied Mechanics, 52, 4, pp. 1045-1054, (2020)

[7]

Wang Yiwei, Huang Chenguang, Research progress on hydrodynamics of high speed vehicles in the underwater launching process, Advances in Mechanics, 48, pp. 259-298, (2018)

[8]

Wu WB, Liu YL, Zhang AM, Et al., Numerical investigation on underwater explosion cavitation characteristics near water wave, Ocean Engineering, 205, (2020)

[9]

Wang Wei, Zhang Qingdian, Tang Tao, Et al., Mechanism investigation of water injection on suppressing hydrofoil cloud cavitation flow, Chinese Journal of Theoretical and Applied Mechanics, 52, 1, pp. 12-23, (2020)

[10]

Zhang Haochen, Zuo Zhigang, Liu Shuhong, Et al., Characteristics of cavitation and prediction of pressure fluctuation at rated condition in high-speed turbopump, Journal of Engineering Thermophysics, 36, 12, pp. 2633-2636, (2015)

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