面向工业应用的粒子遮光检测流速方法研究  

Research on Particle Shading Detection Flow Velocity Method for Industrial Application

作　　者：吴瑜 王佳 余炎子 吴耀华 徐飞然 刘捷 Wu Yu;Wang Jia;Yu Yanzi;Wu Yaohua;Xu Feiran;Liu Jie(Jiu Jiang 707 Institute of Precision Mechatronics SCI&TECH Co.,Ltd.,Jiangri Province Engineering Research Center of Fluid Pollution Control,Jiujiang 332000,Jiangri,China;Jiujiang Branch of Tianjin Navigation Instrument Research Institute,Jiujiang 332007,Jiangzi,China)

机构地区：[1]九江七所精密机电科技有限公司,江西省流体污染控制工程技术研究中心,江西九江332000 [2]天津航海仪器研究所九江分部,江西九江332007

出　　处：《应用激光》2023年第11期127-134,共8页Applied Laser

基　　金：江西省重大科技创新平台培育计划项目(20181BCD41003)。

摘　　要：为实现工业现场微孔流道内流体流速的测量,基于粒子示踪原理,提出一种粒子遮光示踪检测平均流速的方法:以工业系统流体介质广泛存在的5~15μm粒子为示踪粒子,设计微孔视窗控制激光截面尺寸,提高示踪粒子的遮光信号相对强度,避免现场电磁干扰淹没遮光信号。通过评估流体介质内粒子通过激光束的时间,分析粒子速度,从而确定流体介质流速。设计测量装置及实验对测量方法进行验证,对于流场内5~15μm的粒子,斯托克斯数控制在0.1以下,流速在0.27~2.76 m/s范围内时,微流体内局部流速的测量值与数值分析理论值偏差不超过8%,验证了该方法适用于工业系统微孔内流场平均流速的测量。This study introduces a particle shading tracer technique to measure flow velocity in microporous channels in indus-trial applications,based on the principle of utilizing tracer particles to ascertain average flow velocity.Tracer particles,typical-ly 5~15μm particles prevalent in industrial system fluid mediums,are employed.To enhance the relative intensity of the tracer particles'shading signal and counteract the potential drowning effect of field electromagnetic interference,a microporous window was designed to control the laser cross-section size.The velocity of fluid medium is determined by assessing the parti-cle's transit time through the laser beam and analyzing its speed.The measuring device was designed and its method validated through experiments.When the Stokes number of 5~15 micron particles in the flow field is controlled below 0.1 and the flow velocity is in the range of 0.27~2.76 m/s,the deviation from the theoretical value of the measured local flow velocity in the microfluidics is less than 8%.It is proved that the method is suitable for measuring the average velocity of the flow field in the industrial system.

关 键 词：微流体 平均流速 激光测量 粒子示踪 

分 类 号：TH741[机械工程—光学工程]