Visualization of flow separation inside cut kerf during laser cutting of thick sections
文献类型：期刊论文
| 作者 | Zhang C ; Wen P; Yao ZH; Yuan YM(袁越明); Fan XJ(范学军)
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| 刊名 | JOURNAL OF LASER APPLICATIONS
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| 出版日期 | 2016 |
| 卷号 | 28期号:2页码:UNSP 022204 |
| 通讯作者邮箱 | wenpeng@mail.tsinghua.edu.cn |
| ISSN号 | 1042-346X |
| 关键词 | laser cutting gas flow schlieren visualization cutting nozzle |
| 通讯作者 | Wen, P (reprint author), Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China. ; Wen, P (reprint author), Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China. |
| 产权排序 | [Zhang, Chi; Wen, Peng] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China; [Zhang, Chi; Wen, Peng] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China; [Yao, Zhaohui] Tsinghua Univ, Sch Aerosp, Beijing 100084, Peoples R China; [Yuan, Yueming; Fan, Xuejun] Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China |
| 中文摘要 | 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. |
| 类目[WOS] | Materials Science, Multidisciplinary ; Optics ; Physics, Applied |
| 分类号 | 二类 |
| 研究领域[WOS] | Materials Science ; Optics ; Physics |
| 关键词[WOS] | laser cutting ; gas flow ; schlieren visualization ; cutting nozzle |
| 收录类别 | SCI |
| 原文出处 | http://dx.doi.org/10.2351/1.4943997 |
| 语种 | 英语 |
| WOS记录号 | WOS:000374165400016 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/59545]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 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[J]. JOURNAL OF LASER APPLICATIONS,2016,28(2):UNSP 022204. |
| APA | Zhang C,Wen P,Yao ZH,袁越明,&范学军.(2016).Visualization of flow separation inside cut kerf during laser cutting of thick sections.JOURNAL OF LASER APPLICATIONS,28(2),UNSP 022204. |
| MLA | Zhang C,et al."Visualization of flow separation inside cut kerf during laser cutting of thick sections".JOURNAL OF LASER APPLICATIONS 28.2(2016):UNSP 022204. |
入库方式： OAI收割
来源：力学研究所
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