Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions

Jiannan XU; Xinsheng JIANG; Changhua ZHANG; Yijun WANG; Dexiang ZHANG; Wei XIE

doi:10.11949/j.issn.0438-1157.20180854

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Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions

Process safety | 更新时间：2020-06-24

- Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions
- CIESC Journal Vol. 70, Issue 1, Pages: 398-407(2019)
- 作者机构：
  
  1.陆军勤务学院油料系，重庆 401331
  2.四川大学原子与分子物理研究所，四川成都 610000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180854
  CLC： X 932;TQ 038.4
- Received：25 July 2018，
  
  Revised：2018-10-28，
  
  Published：05 January 2019
- 稿件说明：
移动端阅览
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

XU Jiannan, JIANG Xinsheng, ZHANG Changhua, WANG Yijun, ZHANG Dexiang, XIE Wei. Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions[J]. CIESC Journal, 2019, 70(1): 398-407
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 DOI： 10.11949/j.issn.0438-1157.20180854.

XU Jiannan, JIANG Xinsheng, ZHANG Changhua, WANG Yijun, ZHANG Dexiang, XIE Wei. Ignition delay measurements and analysis of kinetic mechanisms for gasoline-air explosion under different conditions[J]. CIESC Journal, 2019, 70(1): 398-407 DOI： 10.11949/j.issn.0438-1157.20180854.

摘要

利用激波管，对常压下温度1200~1600 K、体积分数1.0%~2.4%范围内的92号汽油-空气混合气的着火延迟特性进行了实验研究，以探索低压初始环境中油气爆炸的着火延迟规律。分析了着火延迟时间随点火温度和油气浓度的变化规律；得到了不同浓度下汽油着火延迟时间的计算公式；根据实验结果对比分析了七种机理模型的优劣；结合机理中主要组分的产生、消耗速率变化，剖析了浓度影响着火延迟的原因。结果表明，汽油着火延迟时间与点火温度的倒数呈良好的指数关系；同一高温下，浓度越大，油气着火延迟时间越长，原因是高油气浓度下烃分子与H的反应更强，从而抑制H与O

的反应；在验证的七种机理中，Abhijeet Raj机理在低压下对各油气浓度的着火延迟时间计算精度较高，适宜应用到油气爆炸模拟中。研究为汽油燃烧动力学机理的验证、优化与应用提供了较为准确的数据基础。

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 O

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.

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references

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