基于对冲火焰的碳烟辐射光谱测量及误差分析  

Measurement of soot spectral emission and error analysis based on counterflow flame

作　　者：李磊 温大新 王宇[1,2] LI Lei;WEN Daxin;WANG Yu(School of Automotive Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《江苏大学学报（自然科学版）》2022年第4期488-496,共9页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51976142)。

摘　　要：基于碳烟多光谱辐射法(SSE),测量了乙烯对冲火焰温度和碳烟体积分数分布.为了有效地降低SSE试验的测量误差,提高试验精度,利用数值模拟的方法,定量地研究了多个因素对于对冲火焰温度和碳烟体积分数测量的影响.研究表明:光谱仪信噪比导致低温区温度和碳烟体积分数的测量严重失真;忽略碳烟的自吸收效应,碳烟体积分数将被高估,温度将被低估,且利用较长波段的辐射数据,可以在一定程度上降低由于忽略自吸收效应所带来的影响;标定源温度误差所导致的辐射强度标定误差只影响温度测量的精度,光阑孔径偏差只影响碳烟体积分数的测量精度;碳烟吸收函数的不确定性是温度和碳烟体积分数测量误差的主要来源.The distribution of temperature and soot volume fraction in the ethylene counterflow diffusion flame was measured accurately based on soot spectral emission(SSE)method.To effectively reduce the measurement error of SSE method and improve the accuracy of experiment,the numerical simulation was used to quantitatively investigate the influence of multiple factors on the measurement of temperature and soot volume fraction in the counterflow flame.The research results show that the readout noise of the spectrometer causes serious distortion in the measurement of temperature and soot volume fraction in the low temperature zone.Ignoring the self⁃absorption effect,the soot volume fraction is overestimated,and the temperature is underestimated,while the use of longer wavelength radiation data can reduce the influence of ignoring the self⁃absorption to a certain extent.The radiant intensity calibration error caused by the calibration source temperature error only affects the temperature measurement accuracy,and the diaphragm aperture error only affects the measurement accuracy of the soot volume fraction.The uncertainty of soot absorption function is the main source of error in the measurement of temperature and soot volume fraction.

关 键 词：碳烟 对冲扩散火焰 多光谱辐射法 测量精度 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]