化工学报2019，Vol.70Issue(1)：398-407,10.DOI:10.11949/j.issn.0438⁃1157.20180854
不同工况下汽油蒸气爆炸着火延迟与机理分析
Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions
摘要
Abstract
Ignition characteristics for RON92 gasoline/air were measured in a shock tube at temperatures ranging from 1200 to 1600 K at atmospheric pressure for the first time. Combustion of the mixture with different oil gas concentrations (CH% =1.0%, 1.4%, 1.65%, 2.0%, 2.4%, by volume) was investigated. The experiments were conducted to explore the ignition law of oil gas explosion. Based on experimental data, the variation of ignition delay time with temperature and concentration were analysed. The formula of ignition delay time with temperature under each concentration was fitted. In addition, seven reaction mechanism models were adopted to calculate ignition delay time and comparison was made with experimental results. According to the rate of production(ROP) of some main species simulated by the best model, the influence of concentration on ignition delay was researched. The present study shows that the ignition delay time of gasoline is in good exponential relation with the reciprocal of ignition temperature. And larger concentration leads to longer delay time at the same temperature, because larger oil gas concentration tends to promote the reaction between hydrocarbon molecules and H, which inhibits the reaction between H and O2 as a result. Among the seven validated mechanisms, Abhijeet Raj mechanism exhibits high accuracy in predicting gasoline ignition delay time over a wide range of concentration at low pressure, making it suitable for oil gas explosion simulation. This work should provide experimental data set for validation and refinement of gasoline combustion mechanism and contribute to a method for identifying application conditions of reaction mechanism.关键词
激波管/汽油/着火延迟时间/不同工况/机理分析Key words
shock tube/gasoline/ignition delay time/different conditions/kinetic analysis分类
资源环境引用本文复制引用
徐建楠,蒋新生,张昌华,王易君,张德翔,谢威..不同工况下汽油蒸气爆炸着火延迟与机理分析[J].化工学报,2019,70(1):398-407,10.基金项目
国家重点研发计划项目(2017YFC0804705) （2017YFC0804705）
国家自然科学基金项目(51574254) （51574254）
重庆市科技计划项目(CSTC2014yykfB90001) （CSTC2014yykfB90001）
