Ventilated cloud cavitating flow around a blunt body near the free surface

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	Ventilated cloud cavitating flow around a blunt body near the free surface
	Wang YW(王一伟); Wu XC(吴小翠); Huang CG(黄晨光)
	2016
会议名称	International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
会议日期	10-15 Apr 2016
会议地点	Sheraton Waikiki Hotel, Honolulu, USA
摘要	AbstractVentilated cavitation occurs as an extremely complicated problem if the free surface is close to the cavity boundary around the high-speed underwater vehicle. The cavitating flow around a blunt axisymmetric body very near the free surface is investigated in the present paper. The typical experiment is carried out in a launching system based on an SHPB device, and the numerical scheme is established on the basis of large eddy simulation (LES) and volume of fraction (VOF) methods. Unsteady behaviors such as air injection and shedding of the cloud cavity were obtained, and good agreement was achieved between the numerical and experimental results. The distinctions of evolution features between the cavities on the up and down sides are presented and analyzed. Firstly, strong injection of non-condensable air occurs and changes the media property inside the cavity, which makes the cavity much larger and more stable. Furthermore, because of the small distance between the vehicle and the free surface, the re-entry jet generated in the upper part is very thin and cannot cut off the main cavity clearly, which induces that the upper part of the cavity is approximately unchanged after the growth stage and no shedding phenomenon occurs inside it.
关键词	Ventilated Cavitation Free Surface Large Eddy Simulation
课题组名称	LMFS冲击与耦合效应(LHO)
资助信息	The authors are grateful to the national natural science foundation of china (NSFC) through grant numbers 11202215&11332011.
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/59621
专题	流固耦合系统力学重点实验室
推荐引用方式 GB/T 7714	Wang YW,Wu XC,Huang CG. Ventilated cloud cavitating flow around a blunt body near the free surface[C],2016.

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