球形容器内甲烷-空气爆炸特性分析与理论计算

陆胤臣; 陶刚; 张礼敬

doi:10.11883/1001-1455(2017)04-0773-06

球形容器内甲烷-空气爆炸特性分析与理论计算

doi: 10.11883/1001-1455(2017)04-0773-06

南京工业大学安全科学与工程学院，江苏南京 210009

基金项目:

江苏省2015年度普通高校研究生科研创新计划项目 KYLX15_0774

详细信息

作者简介:
陆胤臣(1991-)，男，硕士研究生

通讯作者:
陶刚，taogang@njtech.edu.cn

中图分类号: O354.1
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- 被引次数: 16
出版历程
- 收稿日期: 2015-12-28
- 修回日期: 2016-03-30
- 刊出日期: 2017-07-25

Analysis and theoretical calculation of explosion characteristics of methane-air mixture in a spherical vessel

College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China

摘要

摘要: 为研究甲烷-空气混合物在密闭球形容器内的爆炸特性，首先利用化学平衡计算软件确定合适的燃烧产物与化学平衡温度，估算甲烷-空气混合物的最大爆炸压力。然后基于火焰增长模型，用MATLAB编辑循环语句程序，计算了甲烷-空气混合气体爆炸的压力时程曲线，通过与实验数据对比，验证了化学平衡软件计算方法与火焰增长模型的可行性，并分析了误差的产生原因。进而利用火焰增长模型推出的经验公式计算爆燃指数，发现在当量比附近与实验结果拟合程度较好。
- 最大爆炸压力 /
- 爆燃指数 /
- 化学平衡计算 /
- 火焰增长模型
Abstract: To study the characteristics of the methane-air mixture exploding in a closed spherical container, we determined the appropriate combustion products and chemical equilibrium temperature using the chemical equilibrium calculation software, thereby predicting the maximum explosion pressure of the mixture. The MATLAB program based on the flame growth model was adopted to calculate the curve showing the relationship between the explosion pressure and time. The calculation processes were verified by the comparison of the obtained results with the experimental data, and the origin of the error was also identified. Further, it is found that the empirical formula of the deflagration index K_G derived from the flame growth model is well fitted with the experimental date near the chemical equivalent line.
- maximum pressure /
- deflagration index /
- chemical equilibrium calculation /
- flame growth model

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图 1 化学平衡计算所得爆炸压力值与实验的对比

Figure 1. Comparison of chemical equilibrium calculation results with experimental data

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图 2 层流燃烧速率与空气燃料比拟合曲线

Figure 2. Fitted curve of laminar flame speed vs. air fuel ratio

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图 3 未燃部分绝热指数拟合曲线

Figure 3. Fitted curve of specific heat ratio for unburned gas

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图 4 已燃部分绝热指数拟合曲线

Figure 4. Fitted curve of specific heat ratio for unburned gas

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图 5 火焰增长模型计算结果与实验值的比较

Figure 5. Comparison of theoretical results by flame growth model with experimental data

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表 1 球形容器内甲烷-空气混合气体的爆燃指数

Table 1. Deflagration index of methane-air mixture in spherical vessel

空气燃料比	K_{G, exp}/(MPa·m·s^-1)	K_G/(MPa·m·s^-1)
空气燃料比	K_{G, exp}/(MPa·m·s^-1)	ξ<1	ξ<0.95	ξ<0.90
0.828	2.136	4.44118	4.21257	3.88981
0.945	6.305	7.50427	7.00937	6.40062
1.055	7.417	8.24091	7.87229	7.17593
1.058	7.365	8.39706	7.84194	7.14657
1.184	5.910	7.66787	7.17321	6.53207

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施引文献

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