基于PIV测量的水击谐波场中分散相粒子的湍流特性分析  

Analysis of turbulence characteristics of dispersed phase particles in water hammer harmonic field based on PIV

作　　者：刘阁[1] 陈彬[1] 沈顺祥[1] 

机构地区：[1]重庆工商大学废油资源化技术与装备教育部工程研究中心,重庆400067

出　　处：《应用力学学报》2018年第5期1083-1088,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51375516);重庆市基础与前沿项目(cstc2016jcyjA0185;cstc2018jcyjAX0121);重庆市技术创新与应用示范项目(cstc2018jscx-msybX0335)

摘　　要：为了解油中分散相粒子的微观运动状态,利用图像采集系统对水击谐波场作用下油中分散相粒子的微观运动状态进行了采集和处理,通过对分散相粒子的湍流特性的PIV(Particle Image Velocimetry)测试,探讨了激振力产生水击谐波的油水分离效果。结果表明:随着施加激振力的增加,粒子在波节(18.2mm)的附近出现了较为明显的聚集涡流和在波腹(68.2mm)的附近出现了明显的发散涡流;粒子的湍流动能、耗散率有两个明显的分布较大的区域,分别对应流场图中的粒子发散涡流、粒子聚集涡流区域与实验管道底部的交界面,而且随着激振力的减少,粒子的湍流动能、耗散率由两个明显的分布较大的区域变为只有一个明显的分布较大的区域,该区域都是含能涡的直接体现。In order to understand the microscopic motion state of oil dispersed phase particles, dispersed phase particle for microscopic motion are collected and processed by using an image acquisition system in water hammer harmonic field of oil. Oil-water separation are explored through the turbulence characteristics of the dispersed phase particles with PIV tests. The results show that the particles appear obviously near the wave node(18.2 mm) as converging vortex and near antinode(68.2 mm) as diverging vortex with the increase of the exciting force. There are significantly two larger distribution areas for the turbulent kinetic energy and the dissipation rate of particles, corresponding to interface regions of diverging vortex and converging vortex particle aggregation with bottom of the experimental pipe, respectively, and the two larger distribution areas merge into one larger distribution area with decrease of exciting force, the region is direct embodiment of the energetic vortices.

关 键 词：水击谐波场 分散相粒子 激振力 湍流 粒子图像测速 

分 类 号：TH815[机械工程—仪器科学与技术]