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液氮磨料射流流场特性及颗粒加速效果研究
黄中伟,蔡承政,李根生,田守嶒
0
(中国石油大学油气资源与探测国家重点实验室,北京 102249;中国石油大学油气资源与探测国家重点实验室,北京 102249;中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州 221116)
摘要:
采用计算流体力学方法,在考虑液氮物性变化以及液氮与磨料颗粒相互作用的基础上,模拟液氮磨料射流流场,并分析液氮射流对磨料颗粒的加速效果。结果表明:在相同喷嘴压降下,液氮磨料射流不仅具有比磨料水射流更高的射流速度和颗粒速度,而且能够在壁面上产生与水射流相当的射流冲击效果;液氮射流能够对颗粒产生较好的加速效果,最大颗粒速度随着喷嘴压降和喷嘴直径的增加而增大,随着颗粒直径的增加而降低;围压和颗粒初始速度对最大颗粒速度影响极小,在工程应用中可以忽略不计。
关键词:  液氮  磨料射流  流场特性  颗粒加速
DOI:10.3969/j.issn.1673-5005.2016.06.010
投稿时间:2016-03-26
基金项目:国家自然科学基金项目(51374220,3);油气资源与探测国家重点实验室开放课题(PRP/open-1507);中国博士后科学基金项目(2016M590523)
Flow behavior and particle acceleration effect of abrasive liquid nitrogen jet
HUANG Zhongwei,CAI Chengzheng,LI Gensheng,TIAN Shouceng
(State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;State Key Laboratory for GeoMechanics and Deep Underground Engineering in China University of Mining and Technology, Xuzhou 221116, China)
Abstract:
Abrasive particles can be added into liquid nitrogen to form an abrasive liquid nitrogen jet (ALNJ) for rocking breaking. In this study, the flow behavior of the ALNJ was studied using the computational fluid dynamics method, considering the properties of liquid nitrogen and its interactions with abrasive particles. The acceleration effect of liquid nitrogen on particles was analyzed. The results show that, at the same nozzle pressure drop, the abrasive liquid nitrogen jet not only has greater jet and particle velocities than water jet, but also displays an equivalent jetting impact effect on the targeted wall. The liquid nitrogen jet can generate excellent acceleration effects on particles, and the maximum particle velocity increases with the increase of the nozzle pressure drop and nozzle diameter, but decreases with the increase of particle diameter. Confining pressure and initial particle velocity have little effect on particle acceleration, which can be neglected in the design of the ALNJ process.
Key words:  liquid nitrogen  abrasive jet  flow behavior  particle acceleration