基于光谱分析的油料池火内部传热特性研究

油料池火焰内部分为不同燃烧区域，目前对油池火内部传热特性研究较少。针对油池火内部传热特性研究不足的现状，构建了红外火焰光谱测试系统，研究分析了92#汽油、95#汽油及润滑油池火焰红外光谱特性，对油池火焰不同燃烧区域的光谱信息进行了提取分析，结果表明：三种油料池火焰光谱特征相似，存在多个CO₂，H₂O及炭黑颗粒等燃烧产物的特征发射波段，3.4 μm处C—H伸缩振动峰明显;火焰烟气区主要光谱特征为4～4.5 μm波段范围内高温CO₂发射峰，该区域火焰与空气换热剧烈，温度变化不稳定，火焰脉动频率较高;火焰间歇区的光谱特征是4～4.5 μm波段范围内高温CO₂发射峰，与烟气区相比，火焰间歇区脉动频率相对较低;与烟气区及间歇区相比，火焰连续区燃烧较为稳定，该区域的光谱特征明显，在2.5～3 μm波段范围内炭黑粒子发射光谱强度较高，且在3.4 μm处存在C—H伸缩振动峰，表明油料池火焰光谱3.4 μm处的特征峰由高温油蒸汽产生。油池火焰不同燃烧区域光谱特征分析表明，油池火焰液态油表面的“富燃料层”吸收火焰传热，引起3.4 μm附近油蒸汽分子能级的改变。油池火焰不同燃烧区域发射光谱强度计算表明，火焰连续区的强度最大，其次为间歇区，火焰烟气区与空气对流强烈，测得的发射光谱强度最低。研究结果为火焰—油料传热模型的修正提供了参考。

Research on Heat Transfer Characteristics in Oil Pool Fire Based on Spectral Analysis

The inner part of the oil pool flame could be divided into different combustion areas,and there have been a limited number of researches on the heat transfer characteristics within oil pool fire.Due to the lack of adequate researches on the char-acteristics of heat transfer in oil pool flame,this paper carries out an analytical study to pool flame spectrums of 92# gasoline, 95# gasoline and lube by establishing flame infrared testing system.Spectral information about different combustion regions of oil pool fire is collected.The results show that three kinds of oil pool fire have similar spectral characteristics,with several char-acteristics emission bands of such combustion products as CO2 ,H2 O and carbon black particles and that 3.4μm C—H stretching vibration peak is obvious;the main spectral characteristics of smoke zone is high temperature CO2 emission peak at the band range of 4~4.5μm,the heat exchange of flame and air is violent;the temperature changes unstably,and flame pulse frequency is high;spectral characteristics in the intermittent area is high temperature CO2 emission peak at 4~4.5μm;and flame pulse frequency in intermittent zone is relatively lower compared with that in the smoke zone;compared with that in the flue gas zone and intermittent zone,the combustion in continuous zone is more stable,the spectral characteristics of the region is obvious,and carbon black particle emission intensity is high at 2.5~3μm,and C—H stretching vibration emission peak shows itself at 3.4μm,which showed that the characteristic peak oil pool flame spectrum at 3.4μm is caused by high temperature oil vapor steam. Spectral characteristics analysis of the oil pool flame in different combustion areas shows that the heat transfer is absorbed by the fuel rich layer on the surface of the oil pool flame,which leads to the change in the energy level of the oil vapor near 3.4μm. The calculation of the emission spectrum intensity of oil pool flame in different combustion areas shows that the intensity in flame continuous zone is the largest,followed by the intermittent zone,that the connection between the flame smoke zone and the air is strong,and that the emission spectrum intensity is the lowest.The results in this study provide a reference for the modification of flame oil heat transfer model.