淹没磨料射流涡旋特性大涡模拟及研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (19) : 1-6.

论文

淹没磨料射流涡旋特性大涡模拟及研究

张欣玮1,2，卢义玉1,2，周哲1,2，汤积仁1,2

作者信息 +

Large Eddy Simulation and Study on Vortex Characteristics of Submerged Abrasive Jet

ZHANG Xin-wei ,2，LU Yi-yu 1,2，ZHOU Zhe1,2, TANG Ji-Ren1,2

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文章历史 +

摘要

基于涡运动理论，采用固-液两相大涡模拟方法模拟了淹没磨料射流的涡量场，分析了涡旋扩散机理与卷吸特性以及磨料随涡运动在射流中的混合分布规律。流场剪切层中涡旋呈对称分布，沿轴线方向涡量呈指数衰减，衰减到最小值两侧涡旋混合成紊流混合区，而等速核内涡量几乎为零。相比于纯水射流，磨料的存在使得射流涡运动减弱，涡旋扩散角减小约50%，等速核增长约30%，减少了能量耗散。磨料在射流束内部时，受涡旋影响，趋向分布于高应变率、低涡量区，在涡旋下游侧磨料浓度最高。同时模拟研究了磨料参数对涡量场的影响规律，结果表明：磨料参数基本不影响扩散角（14.1-15.1°）、等速核长度，卷吸能力随磨料浓度、粒径、密度的升高均呈现小幅度地降低，磨料密度对其影响程度最大，磨料粒径的影响最不明显。

Abstract

Based on the theory of vortex motion, the vorticity field of submerged abrasive jet had been simulated using two-phase large eddy simulation method. The mechanism of eddy diffusion and entrainment had been analyzed, and abrasive distribution with vortex movement had been acquired. The vortex distribution of the shear layer is symmetrical. Vorticity on both sides of the vortex mixing presents exponential attenuation to the minimum value, mixing into turbulent mixing zone. The potential core is irrotational everywhere. Compared with pure water jet, the existence of abrasive makes vortex motion abate, eddy diffusion angle decrease by about 50% and potential core grow by about 30%. The abrasive affected by vortex tends to be distributed in the area of high strain rate and low vorticity. Abrasive concentrates in the downstream side of vortex. It was also studied by simulation that the influence of the abrasive parameters on vorticity field. The results show that the diffusion angle（14.1-15.1°） and potential core basically remain unchanged with the abrasive parameters changing; The entrainment ability decreases slightly with the abrasive concentration、partical size and density.

导出引用

张欣玮1,2，卢义玉1,2，周哲1,2，汤积仁1,2. 淹没磨料射流涡旋特性大涡模拟及研究[J]. 振动与冲击, 2016, 35(19): 1-6

ZHANG Xin-wei,2，LU Yi-yu 1,2，ZHOU Zhe1,2, TANG Ji-Ren1,2. Large Eddy Simulation and Study on Vortex Characteristics of Submerged Abrasive Jet[J]. Journal of Vibration and Shock, 2016, 35(19): 1-6

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