基于红外辐射的爆炸火焰温度补偿测算技术  

Measurement and calculation technology of temperature compensation of explosion flame based on infrared radiation

作　　者：王玮 杜红棉[1] 范锦彪[1] 薛培康 WANG Wei;DU Hongmian;FAN Jinbiao;XUE Peikang(Key Laboratory of Instrumentation Science&Dynamic Measurement Ministry of Education North University of China,Taiyuan 030051,Shanxi,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《爆炸与冲击》2021年第5期99-110,共12页Explosion and Shock Waves

基　　金：国家自然科学基金(61701445)。

摘　　要：应用辐射测温法进行爆炸火焰温度测试时,火焰发射率取经验定值的方法与火焰燃烧机理存在较大的偏差,同时测点距离与环境温湿度也会导致不同程度的热辐射衰减,从而影响爆炸火焰温度的测量精度。本文针对上述两个问题,基于大气辐射理论与光学传播规律,提出了辐射路径衰减补偿模型,结合由红外热像仪和比色测温仪测量的爆炸火焰动态发射率,对爆炸场火焰真温进行联合反演,并将测算结果与比色测温仪测得的火焰表面温度进行对比,得到了反演温度误差范围。试验结果表明,利用本文所提出的补偿模型测算得到的爆炸火焰温度,误差由补偿前的55.699%-89.847%降低到11.292%-59.077%,有效提高了外场爆炸瞬态火焰温度的测算精度。In testing explosion flame temperature with radiation thermometry,there is relatively great deviation of empirical value of flame emissivity from flame combustion mechanism.Meanwhile,the distance of measure point from the flame and ambient temperature and humidity also cause attenuation of thermal radiation to different extent,affecting the accuracy of measurement of explosion flame’s temperature.With focuses on foregoing two problems and based on atmospheric radiation theory and the law of optics propagation,a model of radiation path attenuation compensation was deduced in accordance with the functional relation among explosion flame’s radiance,digital output value of thermal imager and explosion flame’s temperature,followed by obtainment of relevant parameters i.e.system responsivity in the model from radiometric calibration of thermal imager;then,the applicability of the gray body hypothesis of TNT explosion flame was confirmed by analyzing the composition of the products of TNT explosion flame.Therefore,a function model of explosion flame’s dynamic average emissivity was deduced concerning onsite atmospheric transmittance,digital output value of thermal imager and explosion flame’s temperature measured by the colorimetric thermometer in accordance with the expression of explosion flame’s radiance;finally,based on the receiver function of thermal imager’s effective radiation,a joint temperature compensation evaluation method,which combines radiation path compensation and dynamic emissivity,was proposed for joint inversion of explosion flame’s temperature at the explosion site and the range of temperature error of inversion was obtained through comparison of measured result with explosion flame’s surface temperature measured by colorimetric thermometer.The test result suggests the error of explosion flame’s temperature measured with the proposed compensation model is reduced to 11.292%-59.077%from previous 55.699%-89.847%before compensation,thus effectively improving the accuracy of measurem

关 键 词：爆炸瞬态火焰 补偿温度估算 辐射路径衰减补偿模型 动态发射率测算 

分 类 号：O384[理学—流体力学] TJ06[理学—力学]