氨对正庚烷二阶段着火特性的影响  

Effect of Ammonia on Two-stage Ignition Characteristics of N-Heptane

作　　者：宋青峰 李格升[1] 周梦妮[1] 刘彪 张尊华[1] SONG Qingfeng;LI Gesheng;ZHOU Mengni;LIU Biao;ZHANG Zunhua(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1119-1126,共8页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金青年基金(52306160);湖北省自然科学基金青年项目(2022CFB845)。

摘　　要：文中研究了不同掺氨量下氨对正庚烷中低温二阶段着火特性的影响,通过分析关键组分浓度分布、重要基元反应化学反应速率和反应路径等方法,揭示了氨对正庚烷第一阶段(低温)着火和第二阶段(高温)着火的化学动力学影响机制.结果表明:第一阶段,氨的添加会改变正庚烷氧化路径,使部分分解反应转变为异构化反应.同时氨通过与自由基HO_(2)、OH、O、H反应导致正庚烷在第一阶段的消耗量减少;第二阶段,氨的添加后导致OH、O、H自由基浓度降低,而正庚烷整体反应路径基本不变;通过反应路径观察,N_(2)O主要与CO进行反应,进而生成N_(2)与CO_(2);当氨掺混比增多时,NOx的排放为降低.The influence of ammonia on the two-stage ignition characteristics of n-heptane at low and medium temperature was studied.By analyzing the concentration distribution of key components,the chemical reaction rate and reaction path of important elementary reactions,the influence mechanism of ammonia on the chemical kinetics of n-heptane ignition in the first stage(low temperature)and the second stage(high temperature)was revealed.The results show that in the first stage,the addition of ammonia will change the oxidation path of n-heptane and make the partial decomposition reaction change into isomerization reaction.At the same time,ammonia reacts with free radicals HO_(2),OH,O and H to reduce the consumption of n-heptane in the first stage.In the second stage,the concentration of OH,O and H radicals decreased after the addition of ammonia,while the overall reaction path of n-heptane remained basically unchanged.According to the reaction path,N_(2)O mainly reacts with CO,and then N_(2)and CO_(2)are generated.When the mixing ratio of ammonia increases,the emission of NO x decreases.

关 键 词：氨/正庚烷 着火延迟时间 化学动力学分析 着火过程 

分 类 号：TK16[动力工程及工程热物理—热能工程]