Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction

doi:10.1016/j.oceaneng.2020.107925

IMECH-IR > 流固耦合系统力学重点实验室

	Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction
	Zheng YN ; Wang ZY(王志英); Wang GY
发表期刊	OCEAN ENGINEERING
	2020-12-01
卷号	217 页码:107925
ISSN	0029-8018
摘要	The objective of this paper is to investigate the vortex-cavitation interaction in ventilated cavitating flow over a bluff body at Reynolds number Re = 6.7 x 10(4) by numerical method. The results present that in the active cavitation area, the turbulent kinetic energy mainly distributes in the leading edge of the cavity and the gas-liquid interface of the shedding vortex. The intensity variation is closely related to the cavity morphology and the ventilated cavitation development. With the increase of the gas entrainment coefficient Q(nu), the ventilated cavitation reduces the turbulence intensity. Three well-employed vortex identification methods, omega(z) criterion, Q criterion and the improved Omega method, are applied to identify the vortex structures. The comparison shows that the improved Omega method can well capture the vortices of different intensity in the cavitating flow field without using the threshold value, especially for the formation of the vortices. As for the ventilated cavitation vortex dynamics, strong rotation appears with the shear layer rolling up and relatively strong shear occurs with the entrainment of vortices during the vortex formation. With the increase of Q(nu), both the rotation and shear in the active cavitation area tend to become weaken owing to the reduction of turbulent intensity.
关键词	Ventilated cavitating flow Turbulent kinetic energy Vortex identification Vortex-cavitation interaction
DOI	10.1016/j.oceaneng.2020.107925
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000597316900039
项目资助者	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11902323, 51839001]
论文分区	一类
力学所作者排名	1
RpAuthor	Wang, ZY
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/85784
专题	流固耦合系统力学重点实验室
作者单位	1.{Zheng Yanan、Wang Guoyu} Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China 2.{Wang Zhiying} Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zheng YN,Wang ZY,Wang GY. Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction[J]. OCEAN ENGINEERING,2020,217:107925.
APA	Zheng YN,王志英,&Wang GY.(2020).Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction.OCEAN ENGINEERING,217,107925.
MLA	Zheng YN,et al."Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction".OCEAN ENGINEERING 217(2020):107925.

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