Visualization of flow separation inside cut kerf during laser cutting of thick sections

	Visualization of flow separation inside cut kerf during laser cutting of thick sections
	Zhang C; Wen P; Yao ZH; Yuan YM(袁越明); Fan XJ(范学军); Wen, P (reprint author), Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China.
会议录名称	JOURNAL OF LASER APPLICATIONS
	2016
会议名称	34th International Congress on Applications of Lasers and Electro-Optics (ICALEO)
会议日期	OCT 18-22, 2015
会议地点	Atlanta, GA
摘要	The behavior of oxygen gas not only determines the oxidation heat input but also affects the removal of molten metal during laser-oxygen cutting. Flow separation inside the cut kerf is the major problem for the deterioration of cut ability and cut quality, especially for cutting thick steel sections, because it significantly weakens the shear stress on molten slag and changes the pressure gradient along the cut front. There have been some researches on flow separation using numerical simulation and model kerf. However, many experimental details and results are unclear, and the numerical simulation is questionable due to lack of experimental verification. In this paper, a model kerf is set up based on the previous results of observation and cutting trials. High resolution and high speed Schlieren visualization is used to observe the formation of flow separation in the model kerf. Stand-off distance, inlet pressure, cut front slope, nozzle displacement, kerf width, and nozzle tilting angle are used as variables for Schlieren visualization of flow separation for both a conical subsonic and a minimum length nozzle supersonic nozzle. The effect of the above parameters on the position and the pattern of flow separation is discussed based on the gas dynamic theory. It is found that nozzle displacement, kerf width, and nozzle tilting angle are the key factors for flow separation. Possible strategies for controlling flow separation are also proposed for both subsonic and supersonic nozzles. (C) 2016 Laser Institute of America.
WOS记录号	WOS:000374165400016
课题组名称	LHD超声速燃烧
URL	查看原文
收录类别	CPCI-S
语种	英语
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58853
专题	高温气体动力学国家重点实验室
通讯作者	Wen, P (reprint author), Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China.
推荐引用方式 GB/T 7714	Zhang C,Wen P,Yao ZH,et al. Visualization of flow separation inside cut kerf during laser cutting of thick sections[C]JOURNAL OF LASER APPLICATIONS,2016.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
CPCI-Add002.pdf（1350KB）	会议论文		开放获取	CC BY-NC-SA	浏览下载