透过率起伏相关频谱法测量两相流场中颗粒速度、粒径分布和体积分数  

Measurement of Particle Velocity,Particle Size Distribution,and Particle Volume Fraction in Two-Phase Flow Using Transmission Fluctuation Correlation Spectrometry

作　　者：龚鹏 沈建琪[1] Gong Peng;Shen Jianqi(College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学理学院,上海200093

出　　处：《中国激光》2022年第23期98-108,共11页Chinese Journal of Lasers

摘　　要：两相流中颗粒的运动速度、粒径分布和体积分数是非常重要的参数。本文介绍了一种基于透过率起伏相关频谱测试技术的光学测量装置,并采用该装置实现了颗粒运动速度、粒径分布和体积分数的同时测量。该测试装置具有结构简单、易实现和便于安装维护等特点,有望应用于两相流的在线实时测量。实验结果与标称直径、其他测量方法所得结果相符并具有较好的重复性,证明了测试装置的可行性。Objective Particle-fluidtwo-phaseflows exist widely in energy,industry,environment,and other fields.Thus,it is importantto simultaneously determine the parameters of two-phase flow,such as the particle size distribution,volume fraction,and flow velocity.For example,in a thermal power plant,the particle size distribution of pulverized coal and its feed flow are critical issues in ensuring combustion efficiency and reducing pollutant emissions.In mineral processing and feed manufacturing,real-time measurement of these parameters is important for maintaining stable conditions to ensure the quality of products.It is also important in other applications,such as pipeline transportation using air as the carrier medium,in which real-time monitoring of flow velocity is necessary.With the development of science and technology,different online measurement techniques have been proposed and used to measure the parameters of particles in a twophaseflow,including ultrasonic spectrometry,image methods,and digital holography.However,some techniques are limited in their applications because their measurements can be affected by poor environmental conditions.In principle,ultrasonic spectrometry requires several particle and dispersion parameters,which are usually unavailable.Digital holographictechnologyemploysa complicated optical setup that can be easily contaminated by dust.In addition,this techniqueis suitable only for measuring low particle volume fractions.Therefore,there is an urgent need to develop a simplemeasurement setup for real-time and online(or inline)measurements of the particle parameters of two-phase flows.Methods Transmissionfluctuation correlation spectrometry(TFCS)is an optical measurement technique that utilizes the autocorrelation characteristics of transmission fluctuation signals of a narrow light beam to obtain information on particlesize distribution and volume fraction.In this study,a simple beam-splitting setup was used,which produced two parallelnarrow beams,allowing the detection of two channels of tr

关 键 词：测量 两相流 透过率起伏相关频谱 颗粒粒径分布 

分 类 号：O436[机械工程—光学工程]