CAJ | 학술논문

利用分子束质谱结合真空紫外同步辐射光电离技术对相同燃烧条件下的低压层流预混二甲醚,氧气/氩气和乙醇/氧气,氩气火焰进行研究.通过测量光电离效率曲线,识别了二甲醚和乙醇火焰的中间物种,得到相应的火焰质谱;通过测量火焰中各物种在燃烧炉炉膛各位置的电离信号强度,得到了各物种的摩尔分数分布曲线.结合两种燃料分子不同的化学结构及详细的燃烧化学反应机理,分析了两火焰中间物种生成特性的异同.研究结果表明:甲醛为两火焰中最主要的C_1中间物种;二甲醚火焰趋向于生成C_1中间物种,C_2物种摩尔分数较低;乙醇火焰中乙醛、乙烯、乙炔和乙烯酮等C_2中间物种的摩尔分数明显高于二甲醚火焰中的值.
이용분자속질보결합진공자외동보복사광전리기술대상동연소조건하적저압층류예혼이갑미,양기/아기화을순/양기,아기화염진행연구.통과측량광전리효솔곡선,식별료이갑미화을순화염적중간물충,득도상응적화염질보;통과측량화염중각물충재연소로로당각위치적전리신호강도,득도료각물충적마이분수분포곡선.결합량충연료분자불동적화학결구급상세적연소화학반응궤리,분석료량화염중간물충생성특성적이동.연구결과표명:갑철위량화염중최주요적C_1중간물충;이갑미화염추향우생성C_1중간물충,C_2물충마이분수교저;을순화염중을철、을희、을결화을희동등C_2중간물충적마이분수명현고우이갑미화염중적치.
Low pressure premixed laminar dimethyl ether(DME)/oxygen/argon and ethanol/oxygen/argon flames (equivalence ratio:1.0)were studied by molecular-beam sampling mass spectrometry (MBMS) combined with the tunable synchrotron radiation photoionization technique.Combustion intermediates were identified by measuring photoionization efficiency (PIB) spectra,and the mole fraction profiles of these species at different flame positions were presented.Similarities and differences of main intermediate formation characteristics between the two flames were analyzed based on derived reaction mechanisms.Experimental rcsults show that both flames contain the same intermediates such as CH_3,CH_4, C_2H_2,C_2H_4, CH_2O,CH_3OH,CH_2=C=O,CH_3HO,and CH_2CHOH.In the DME flame,the concentration of the C_1 species is much higher than that of the C_2 species,i.e.,C_1 intermediates tend to form rather than G_2 intermediates in a DME flame.In addition,formaldehyde is the dominant C_1 species in each flame.The concentrations of C_2 species like ethylene,acetaldehyde,acetylene,and ketene in the ethanol flame are remarkably higher than that found in the DME flame.