摘要
为了探寻空化现象对水导激光微水束稳定性影响,利用计算流体动力学的方法,分别在不考虑空化和考虑空化的情况下,对从典型喷嘴出射的水射流进行了数值模拟分析,研究了空化现象的产生机理及对微水束稳定性的影响。结果表明,在入口直径为0.1 mm、圆柱段长径比为1、上边缘锐利的喷嘴结构下,随着入口压力从0.2 MPa增大到16 MPa,水射流与喷嘴壁面分离后再次附着的长度逐渐增大,并且空化会导致该长度延长;在入口压力小于6 MPa的情况下,不考虑空化的水射流在稳定后会贴着喷嘴壁面流下,而添加空化模型使得水束形成翻转流。该研究对设计满足水导激光工艺的喷嘴结构有着重要的参考价值。
In order to explore the influence of cavitation on the stability of the micro-water beam of the water guide laser,the numerical simulation analysis of the water jet from a typical nozzle was carried out by using the computational fluid dynamics method without considering cavitation and considering cavitation respectively,and the generation mechanism of cavitation and its influence on the stability of the micro-water beam was studied.The calculation results show that under the nozzle structure with the inlet diameter of 0.1 mm,the length-diameter ratio of the cylinder section of 1,and the sharp upper edge,with the inlet pressure increasing from 0.2 MPa to 16 MPa,the re-attachment length of the water jet after separation from the nozzle wall gradually increases,and cavitation will lead to the extension of the length.When the inlet pressure is less than 6 MPa,the water jet,without considering cavitation,will flow down the nozzle wall after stabilization,and the addition of a cavitation model can make the water beam form a flipped flow.The simulation results have important reference values for the design of nozzle structures that meet the requirements of water-guide laser technology.
作者
张晓斌
史铁林
龙胡
ZHANG Xiaobin;SHI Tielin;LONG Hu(Department of Mechanical and Electronic Engineering,School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《激光技术》
CAS
CSCD
北大核心
2024年第2期216-222,共7页
Laser Technology
关键词
激光技术
水导激光
有限元仿真
微水束稳定
空化现象
laser technique
water-guided laser
finite element simulation
micro water beam stabilization
cavitation phenomenon
