CAJ | 학술논문

在低压预混层流火焰条件下,利用同步辐射光电离技术,结合分子束质谱法,对当量比为1的二甲醚和乙醇火焰进行了研究.通过扫描火焰中光子的能量,描绘出PIE曲线,探测到了这两种燃料燃烧过程中包含的同分异构中间产物;同时,通过扫描燃烧炉不同位置的光子能量谱,获得了火焰中重要物质的摩尔分数.比较两者的火焰结构,结果表明,这一对同分异构的燃料燃烧时,由于分子结构不同,它们的中间产物和相同中间产物的摩尔分数有很大差异,含氧的中间产物摩尔分数有较大差异.另外,在二甲醚火焰中还发现了甲乙醚,拓宽了对含氧碳氢化合物燃烧的认识.
재저압예혼층류화염조건하,이용동보복사광전리기술,결합분자속질보법,대당량비위1적이갑미화을순화염진행료연구.통과소묘화염중광자적능량,묘회출PIE곡선,탐측도료저량충연료연소과정중포함적동분이구중간산물;동시,통과소묘연소로불동위치적광자능량보,획득료화염중중요물질적마이분수.비교량자적화염결구,결과표명,저일대동분이구적연료연소시,유우분자결구불동,타문적중간산물화상동중간산물적마이분수유흔대차이,함양적중간산물마이분수유교대차이.령외,재이갑미화염중환발현료갑을미,탁관료대함양탄경화합물연소적인식.
A molecular-beam flame-sampling photoionization mass spectrometer with synchrotron radiation is applied to the measurement of mole fractions in low-pressure premixed stoichiometric ratio(φ=1) DME/oxygen/argon and ethanol/oxygen/argon flat flames. Flame species,including isomeric intermediates,are unambiguously identified with measurements of photoionization efficiency spectra by scanning photon energy. And in the meantime,mole fraction profiles of most observed species are measured by scanning the burner position at selected photon energies near ionization thresholds. The comparisons of the chemical structures of two flames have been made,based on the comprehensive experimental data. It is concluded that different structural features of fuel molecules will cause great variation in intermediate pools,in mole fraction of the same intermediates,and especially in oxygenated intermediates. They further confirm the presence of ethyl methyl ether,a molecule previously unobserved in flames and not included in the present flame models,and this widens the knowledge of oxygenated hydrocarbon combustion.