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

doi:10.11949/j.issn.0438-1157.20180854

Abstract

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.

Key words: shock tube, gasoline, ignition delay time, different conditions, kinetic analysis

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O₂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。

关键词: 激波管, 汽油, 着火延迟时间, 不同工况, 机理分析

CLC Number:

Jiannan XU, Xinsheng JIANG, Changhua ZHANG, Yijun WANG, Dexiang ZHANG, Wei XIE. 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.

Figures/Tables 13

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CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs
1.0%	1241	1054	1.4%	1262	1001	1.65%	1218	1553	2.0%	1252	1141	2.4%	1234	1451
	1274	683		1303	457		1283	734		1283	726		1271	956
	1348	219		1319	440		1284	649		1304	573		1301	655
	1323	325		1332	313		1296	608		1320	374		1339	404
	1375	163		1372	195		1318	430		1356	243		1365	282
	1417	82		1445	83		1371	185		1422	138		1377	215
	1444	67					1445	104		1439	96		1459	103

CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs	CH%	T/K	τ/μs
1.0%	1241	1054	1.4%	1262	1001	1.65%	1218	1553	2.0%	1252	1141	2.4%	1234	1451
	1274	683		1303	457		1283	734		1283	726		1271	956
	1348	219		1319	440		1284	649		1304	573		1301	655
	1323	325		1332	313		1296	608		1320	374		1339	404
	1375	163		1372	195		1318	430		1356	243		1365	282
	1417	82		1445	83		1371	185		1422	138		1377	215
	1444	67					1445	104		1439	96		1459	103

Temperature/K	Concentration/%(vol)
Temperature/K	2.4	2.0	1.65	1.4	1.0
1250	1227	1139	1043	1126	611
1330	428	373	362	346	188
1450	110	88	92	75	41

Temperature/K	Concentration/%(vol)
Temperature/K	2.4	2.0	1.65	1.4	1.0
1250	1227	1139	1043	1126	611
1330	428	373	362	346	188
1450	110	88	92	75	41

Reaction mechanism	Number of species	Number of reactants	Ref.	Surrogate fuel
mech 1	339	2791	[35]	surrogate B
mech 2	226	2121	[36]	surrogate A
mech 3	109	543	[37]	surrogate A
mech 4	323	1489	[38]	surrogate A
mech 5	199	1011	[39]	surrogate A
mech 6	56	168	[40]	surrogate A
mech 7	1121	4961	[18]	surrogate A