炉内含颗粒耗散介质中的声波衰减特性研究  

Acoustic Wave Attenuation Characteristics of Particle-laden Dissipative Media in Furnaces

作　　者：任国辉 姜根山[1] 刘月超 许伟龙 REN Guohui;JIANG Genshan;LIU Yuechao;XU Weilong(School of Mathematics and Physics,North China Electric Power University,Beijing 102206,China;Department of Mathematics and Physics,North China Electric Power University,Baoding 071003,Hebei Province,China;China Ship Development and Design Center,Wuhan 430064,Hubei Province,China)

机构地区：[1]华北电力大学数理学院,北京102206 [2]华北电力大学数理系,河北保定071003 [3]中国舰船研究设计中心,湖北武汉430064

出　　处：《动力工程学报》2025年第1期19-27,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(12274122,12074118)。

摘　　要：为了研究含颗粒耗散介质对可听声波的衰减机理,以电站锅炉炉膛为研究对象,在比较边界层厚度与颗粒半径的基础上,给出了不同边界层厚度下的声衰减计算公式。根据边界层理论进行数值分析,讨论了不同边界层厚度下声衰减系数随颗粒体积分数、声频率、颗粒粒径、烟气温度和烟气密度的变化规律。结果表明:薄边界层下的声衰减主要源于烟气媒质吸收和散射衰减,中边界层和厚边界层下的声衰减主要源于颗粒介质表面边界层的能量损失;声衰减系数随着颗粒体积分数、声频率和烟气温度的增大而增大,但随着烟气密度的增大而减小,该研究为粉尘浓度的在线监测提供了理论基础。To investigate the attenuation mechanism of audible acoustic waves by particle-laden dissipative media,the acoustic attenuation equations with different boundary layer thicknesses were derived by comparing the boundary layer thickness with the particle radius when the furnace of utility boiler was considered as the research subject.Numerical analysis was performed according to the boundary layer theory.The variation of acoustic attenuation coefficient with particle volume fraction,acoustic frequency,particle size,flue gas temperature,and flue gas density was elucidated under different boundary layer thicknesses.Results show that the acoustic attenuation within the thin boundary layers is primarily attributed to the absorption and scattering attenuation of the flue gas medium,whereas the acoustic attenuation within the medium and thick boundary layers is predominantly due to energy dissipation in the boundary layer of particulate medium surface.The acoustic attenuation coefficient is positively correlated with particle volume fraction,acoustic frequency,and flue gas temperature,but inversely correlated with flue gas density,which provides a theoretical foundation for the real-time monitoring of dust concentration.

关 键 词：电站锅炉 声传播特性 声衰减系数 气固两相流 边界层 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]