微水导激光稳定水束光纤的CFD仿真研究

利用计算流体力学(CFD)的方法对水射流进行了气/液两相流数值模拟分析,研究了一定喷嘴结构下获得最大稳定射流长度时所需的入口速度大小,分析了不同速度下射流破碎长度和稳定长度的及射流破碎形式,并验证了射流的缩流现象。计算结果表明,在直径为0.2mm,长径比为2.5,入口无倒角的喷嘴结构下,喷射速度50²00m/s时,可获得的水射流最大稳定长度70mm。液体经喷嘴喷出时,在喷嘴口会产生缩流,缩流后射流直径约为喷嘴直径的80%200m/s时,可获得的水射流最大稳定长度70mm。液体经喷嘴喷出时,在喷嘴口会产生缩流,缩流后射流直径约为喷嘴直径的80%⁸5%。

CFD Simulation of the Laser Stable Water Beam in Micro Water-jet Guided Laser

Computational Fluid Dynamics( CFD) method was used in this paper to simulate and analyze the gas-water two phase flow of water jets. Studied the optimal speed for the maximum length of water jet under certain nozzle diameter. Acquired the volume fraction contours of water / gas and the speed curve in axis position under six speed entrance,Analysed the stable length and broken length and the style of broken in six entrance speed,The phenomenon of jet contraction was verificated. The simulation shows that when the nozzle diameter is 0. 2mm,length to diameter ratio is 2. 5,the longest stable length can be acquired with the speed range from 50m / s to 200m / s,the length can reached to 70mm. the contraction will occur in the nozzle exit when the liquid injected into a gas medium.