Numerical simulation of unsteady cavitation in a high-speed water jet

doi:10.5293/IJFMS.2016.9.1.066

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	Numerical simulation of unsteady cavitation in a high-speed water jet
	Peng, Guoyi 1; Okada, Kunihiro 1; Yang, Congxin 2; Oguma, Yasuyuki 1; Shimizu, Seiji 1
刊名	International Journal of Fluid Machinery and Systems
	2015-12-19
卷号	9 期号:1 页码:66-74
关键词	Cavitation Computational fluid dynamics Gas dynamics Jets Mine roof supports Mixtures Nozzles Numerical methods Numerical models Orifices Bubble dynamics Compressible fluids Compressible mixtures Density correction High speed water jet Intensive cavitations Submerged water jet Unsteady cavitation
DOI	10.5293/IJFMS.2016.9.1.066
英文摘要	Concerning the numerical simulation of high-speed water jet with intensive cavitation this paper presents a practical compressible mixture flow method by coupling a simplified estimation of bubble cavitation and a compressible mixture flow computation. The mean flow of two-phase mixture is calculated by URANS for compressible fluid. The intensity of cavitation in a local field is evaluated by the volume fraction of gas phase varying with the mean flow, and the effect of cavitation on the flow turbulence is considered by applying a density correction to the evaluation of eddy viscosity. High-speed submerged water jets issuing from a sheathed sharp-edge orifice nozzle are treated when the cavitation number, σ = 0.1, and the computation result is compared with experimental data The result reveals that cavitation occurs initially at the entrance of orifice and bubble cloud develops gradually while flowing downstream along the shear layer. Developed bubble cloud breaks up and then sheds downstream periodically near the sheath exit. The pattern of cavitation cloud shedding evaluated by simulation agrees experimental one, and the possibility to capture the unsteadily shedding of cavitation clouds is demonstrated. The decay of core velocity in cavitating jet is delayed greatly compared to that in no-activation jet, and the effect of the nozzle sheath is demonstrated. © 2016, Turbomachinery Society of Japan. All rights reserved.
语种	英语
出版者	Turbomachinery Society of Japan
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112772]
专题	新能源学院能源与动力工程学院
作者单位	1.Department of Mechanical Engineering, College of Engineering, Nihon University Tamura-machi, Koriyama; Fukushima; 963-8642, Japan; 2.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China
推荐引用方式 GB/T 7714	Peng, Guoyi,Okada, Kunihiro,Yang, Congxin,et al. Numerical simulation of unsteady cavitation in a high-speed water jet[J]. International Journal of Fluid Machinery and Systems,2015,9(1):66-74.
APA	Peng, Guoyi,Okada, Kunihiro,Yang, Congxin,Oguma, Yasuyuki,&Shimizu, Seiji.(2015).Numerical simulation of unsteady cavitation in a high-speed water jet.International Journal of Fluid Machinery and Systems,9(1),66-74.
MLA	Peng, Guoyi,et al."Numerical simulation of unsteady cavitation in a high-speed water jet".International Journal of Fluid Machinery and Systems 9.1(2015):66-74.