火焰参数对辐射图像法不同测温模型的影响  

Influence of Flame Parameters on Different Models of Radiation Image Temperature Measurement

作　　者：丁永三 秦永新 林楠 张彪[2] 许传龙[2] DING Yong-san;QIN Yong-xin;LIN Nan;ZHANG Biao;XU Chuan-long(Guo Dian Jianbi Power Plant,Zhenjiang 212006,China;School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]国家能源集团谏壁发电厂,江苏镇江212006 [2]东南大学能源与环境学院,江苏南京210096

出　　处：《节能技术》2020年第3期195-200,共6页Energy Conservation Technology

基　　金：国家能源集团总部科技项目(GJNY-18-01)。

摘　　要：对火焰温度分布的实时测量能够了解燃烧过程、验证燃烧机理、预防工业事故、优化燃烧设备。图像法测温在工业现场的火焰三维温度测量上有明显的优势,但通常均考虑火焰为均匀折射率介质,给测温结果带来了不可避免的误差。本文建立了梯度折射率介质下火焰的辐射成像模型和图像法测温模型,验证了方法的正确性,分析了火焰尺寸对成像的影响及炭黑颗粒浓度对温度场重建的影响。得出随着火焰尺寸的增大,图像强度随火焰尺寸出现先增大后减小的趋势,梯度介质模型与均匀介质模型的差异逐渐增大,随着炭黑颗粒浓度的增加,两种模型的重建精度逐渐下降。Real-time measurement of flame temperature distribution can understand the combustion process,verify the combustion mechanism,prevent industrial accidents,and optimize combustion equipment.Image temperature measurement has obvious advantages in the three-dimensional temperature measurement of flames in industrial sites,but the flame is usually considered as a uniform refractive index medium,which brings inevitable errors to the temperature measurement results.In this paper,the radiation imaging model and image temperature measurement model of flame under gradient refractive index medium are established.Then the correctness of the method is verified.Finally,the influence of flame size on imaging and the influence of soot concentration on temperature field reconstruction are analyzed.It is concluded that with the increase of flame size,the image intensity increases first and then decreases with the size of the flame.The difference between the gradient medium model and the uniform medium model increases gradually.With the increase of soot concentration,the reconstruction accuracy of the two models is gradually decreasing.

关 键 词：梯度折射率介质 辐射传递方程 有限体积法 火焰 三维测温 

分 类 号：TK124[动力工程及工程热物理—工程热物理]