甲烷爆炸感应期内火焰光谱特征分析方法研究

The Study about Spectrum Characteristic Analysis Method in the Induction Period of Gas Explosion Flame

基于目标发射光谱分析法的原理,通过分析小尺寸实验平台上测得的体积分数10%的甲烷爆炸火焰光谱数据,提出甲烷爆炸火焰光谱特征分析方法,包括频域特征参数光谱密度、波段辐射光强度、波段平均及偏差,时域特征参数波段辐射能量、时间段平均及偏差和特性参数偏度、峰度、半宽的计算方法;分析得出当甲烷爆炸火焰光谱波长值为某些定值时,光谱密度在1nm范围内在正向与负向之间转换,表明光强密集程度变化剧烈;甲烷爆炸火焰光谱波段定积分在550～900nm波段最强;甲烷爆炸火焰光谱信号随着波长的增大可测时间增长,信号强度在达到峰值后整体呈衰减趋势,在衰减过程中间隔出现依次减弱的强度增强;研究结果表明目标发射光谱分析法可应用于甲烷爆炸感应期内火焰光谱的动态半定量分析,分析得出的光谱特征可作为检测甲烷爆炸火焰的判据。

Through analyzing the spectroscopic data of gas explosion flame whose volume fraction is 10% under a small scale experimental condition based on the target emission spectrum analysis methods;presents the gas explosion flame spectrum characteristic analysis methods about frequency domain feature parameters which include spectral density,band radiation light intensity,band average deviation,the time domain characteristic parameter which include band radiation energy,time average and deviation and the characteristic parameters which include skewness,kurtosis and half width;obtain the results that in the vicinity of somewhere,the spectral density converts between positive and negative in the range of 1nm that the light intensity of gas explosion flame changes dramatically;the definite integral of gas explosion flame spectral waveband is strongest in the 550～900nm;with the wavelength increases the detected time grow,the gas explosion flame spectral signal strength attenuation trends on the whole and after the peak interval appeared in the process of decay have weaken the strength of the enhanced;results show that the target emission spectrum analysis methods can be applied to do the semi-quantitative analysis of dynamic process of gas explosion,the analysis spectral characteristics can be taken as a standard to detecting gas explosion flame.