遮光度对激光散射法粒径测量影响及修正  

Evaluating and Correcting Laser Diffraction Particle Size Measurement Errors at Different Obscurations

作　　者：苏格毅 孙存金 邓飞 苏明旭[1] SU Geyi;SUN Cunjin;DENG Fei;SU Mingxu(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《工程热物理学报》2024年第9期2696-2701,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52376162,No.51976130)。

摘　　要：针对液固两相流体系分散相粒径表征中复散射导致低估粒度问题,建立基于蒙特卡罗(Monte Carlo)方法的激光散射模型,研究高遮光度下颗粒光散射特性。为验证模型准确性,搭建一套散射光能分布和遮光度同步测量系统,对不同浓度聚苯乙烯悬浮液进行试验。结果表明:未考虑复散射时,蒙特卡罗模型与传统模型散射光能吻合度良好。考虑复散射时,随着遮光度增加,散射光能曲线逐渐偏移,反演误差逐渐变大。遮光度为0.15~0.20,反演误差在5%以内。然而,遮光度为0.55~0.60,反演误差超过13%。进行误差修正,通过蒙特卡罗方法建立的激光散射模型构造系数矩阵,对粒径2.6μm颗粒的实验谱反演,误差在3%以内,表明该模型可在高遮光度下准确反演粒度。Multiple scattering effects can result in an underestimation of the particle size.To investigate the light scattering characteristics of high-obscuration particles,a Monte Carlo methodbased Mie model has been developed.A constructed system was utilized to conduct a series of experiments on two standard particles at different concentrations,measuring both scattered light energy distribution and obscuration simultaneously.The results show that the Monte Carlo model agrees well with the traditional model.When multiple scattering was taken into account,as the obscuration increased,the scattered light energy curves gradually shifted,and the inversion error gradually became larger.For an obscuration range of 0.15∼0.20,the inversion error is within 5%.However,for an obscuration range of 0.55∼0.60,the inversion error escalated beyond 13%.Moreover,by utilizing inversion correction on experimental spectra for 2.6μm,the error was successfully reduced to≤3%.The model allows for the accurate inversion of particle size in the presence of high obscuration.

关 键 词：复散射 激光散射法 蒙特卡罗方法 遮光度 反演 

分 类 号：O436.2[机械工程—光学工程]