CAJ | 학술논문

利用化学反应动力学软件 CHEMKIN 对现有甲醇详细反应动力学机理进行研究和分析.计算结果表明,活化热氛围条件下,现有甲醇机理与缸内取样实测低温阶段甲醛体积分数变化历程存在差异.基于前期缸内取样试验数据及国外相关研究结果,对甲醇低温机理中的关键反应速率进行了修正.经验证,修正机理低温阶段甲醛体积分数历程及着火时刻与试验结果更为吻合.利用修正机理就关键物质体积分数对甲醇低温氧化过程的影响进行了模拟研究.计算结果表明,甲醛初始体积分数从0增加到2×10-6使着火始点提前了近3° CA,而从2×10-6增加到20×10-6时着火时刻提前不到1° CA,说明甲醛体积分数从“无”到“有”的变化将对甲醇低温氧化及后续着火产生明显的影响.
이용화학반응동역학연건 CHEMKIN 대현유갑순상세반응동역학궤리진행연구화분석.계산결과표명,활화열분위조건하,현유갑순궤리여항내취양실측저온계단갑철체적분수변화역정존재차이.기우전기항내취양시험수거급국외상관연구결과,대갑순저온궤리중적관건반응속솔진행료수정.경험증,수정궤리저온계단갑철체적분수역정급착화시각여시험결과경위문합.이용수정궤리취관건물질체적분수대갑순저온양화과정적영향진행료모의연구.계산결과표명,갑철초시체적분수종0증가도2×10-6사착화시점제전료근3° CA,이종2×10-6증가도20×10-6시착화시각제전불도1° CA,설명갑철체적분수종“무”도“유”적변화장대갑순저온양화급후속착화산생명현적영향.
The chemical kinetic software package CHEMKIN was used to study and analyze the popular methanol detailed kinetic mechanism. The results show that the existing methanol kinetic mechanism can hardly depict the methanol concentration change at low temperature compared with the in-cylinder sampling results in active thermo-atmosphere. The reactive rates of some key reactions at low temperature were adjusted according to the in-cylinder sampling data and foreign research results. And the results show that the formaldehyde concentration history in low-temperature process and the ignition timing are in good agreement with the experimental results. The revised kinetic model was used to simulate methanol oxidization process in order to study the effects of key substances on low-temperature oxidation process. The results show that when the initial formaldehyde concentration increases from 0 to 2×10-6,the ignition time advances by nearly 3°CA;however,when the initial formaldehyde concentration changes from 2×10-6 to 20×10-6,the ignition time advances by only 1°CA. It illustrates that low-concentration formaldehyde has a significant effect on the low-temperature oxidation and ignition timing of methanol.