三元混合气体燃料爆炸特性实验研究

doi:10.11949/0438-1157.20211256

摘要/Abstract

摘要：

利用定容燃烧弹爆炸实验平台结合高速纹影摄像技术，系统研究了组分浓度和当量比对氢气/二甲醚/甲烷三元混合气体燃料爆炸特性的影响。结果表明：平均火焰传播速度S_a随氢气浓度 $X H 2$ 的增加单调递增，随二甲醚浓度X_DME和甲烷浓度 $X C H 4$ 的增加单调递减。压力峰值p_max与 $X H 2$ 的关系受到当量比φ的强烈影响，当φ=0.8、1.0和1.2时，p_max随 $X H 2$ 先缓慢线性增加然后快速增加；而当φ=0.6、1.4和1.6时，p_max始终线性增加；同时，p_max随 $X C H 4$ 线性递减，而随X_DME的变化可分为两个时期。 $X H 2$ 与最大压力上升速率(dp/dt)_max呈正相关关系， $X C H 4$ 与之呈负相关关系，而X_DME对(dp/dt)_max的影响不大。燃烧时间t_c与 $X H 2$ 和 $X C H 4$ 存在线性关系；而X_DME对t_c的影响较为复杂，与φ有关。

关键词: 氢气, 二甲醚, 甲烷, 爆炸, 压力

Abstract:

The effects of component concentration and equivalence ratio on the explosion characteristics of hydrogen/dimethyl ether/methane ternary mixed gas fuel were systematically studied by using the constant volume combustion bomb explosion experimental platform and high-speed schlieren camera technology. The results show that the average flame propagation speed S_a increases monotonically with the increase of hydrogen concentration $X H 2$ and decreases monotonically with the increase of dimethyl ether concentration X_DME. Also S_a decreases monotonically with $X C H 4$ . The variation of explosion pressure peak p_max with $X H 2$ is strongly affected by equivalence ratio φ. When φ= 0.8, 1.0 and 1.2, p_max increases slowly and linearly with $X H 2$ , and then increases rapidly with $X H 2$ ; While when φ=0.6, 1.4 and 1.6, p_max continuously increases linearly with $X H 2$ . Meanwhile, p_max decreases linearly with the increase of $X C H 4$ , but p_max can be divided into two periods with the change of X_DME. In addition, $X H 2$ is positively correlated with the maximum pressure rise rate (dp/dt)_max, and $X C H 4$ is negatively correlated with (dp/dt)_max. However, X_DME has little effect on (dp/dt)_max. The combustion time t_c has a linear relationship with $X H 2$ and $X C H 4$ . Conversely, the influence of X_DME on t_c is more complicated, which is related to φ.

Key words: hydrogen, dimethyl ether, methane, explosion, pressure

中图分类号:

TD 712

韦双明, 余明高, 裴蓓, 李世梁, 康亚祥, 徐梦娇, 郭佳琪. 三元混合气体燃料爆炸特性实验研究[J]. 化工学报, 2022, 73(1): 451-460.

Shuangming WEI, Minggao YU, Bei PEI, Shiliang LI, Yaxiang KANG, Mengjiao XU, Jiaqi GUO. Experimental study on explosion characteristics of ternary mixed gas fuel[J]. CIESC Journal, 2022, 73(1): 451-460.

图/表 13

图1 实验装置图

Fig.1 Experimental setup

图2 不同氢气/二甲醚/甲烷浓度下球形火焰传播纹影图像（φ=1.0）

Fig.2 Schlieren images of spherical flame propagation under different hydrogen/dimethyl ether/methane concentrations(φ=1.0)

图3 平均火焰传播速度定义图（XH2=20%）

Fig.3 Definition diagram of average flame propagation speed（XH2=20%）

图4 不同氢气/二甲醚/甲烷浓度下平均火焰传播速度变化曲线(φ=1.0)

Fig.4 Variation curves of average flame propagation speed under different hydrogen/dimethyl ether methane concentrations(φ=1.0)

图5 氢气浓度对爆炸压力峰值的影响

Fig.5 Effect of hydrogen concentration on explosion peak pressure

图6 甲烷浓度对爆炸压力峰值的影响

Fig.6 Effect of methane concentration on explosion peak pressure

表1 式（3）的线性拟合参数

Table 1 Linear fitting parameters of Eq. （3）

当量比φ	斜率b	截距a	拟合度R²
0.6	-0.225	0.621	0.952
0.8	-0.095	0.741	0.940
1.0	-0.153	0.855	0.927
1.2	-0.140	0.838	0.960
1.4	-0.199	0.791	0.956
1.6	-0.356	0.733	0.985

图7 二甲醚浓度对爆炸压力峰值的影响

Fig.7 Effect of dimethyl ether concentration on explosion peak pressure

图8 最大压力上升速率及爆炸指数随当量比的变化关系

Fig.8 Variation of maximum pressure rise rate and explosion index with equivalence ratio

图9 组分浓度对最大压力上升速率及爆炸指数的影响

Fig.9 Influence of component concentration on maximum pressure rise rate and explosion index

图10 组分浓度对燃烧时间的影响

Fig.10 Effect of component concentration on combustion duration

表2 式（5）的线性拟合参数

Table 2 Linear fitting parameters of Eq. （5）

当量比φ	斜率d	截距c	拟合度R²
0.6	-478.95	455.64	0.940
0.8	-117.74	152.05	0.958
1.0	-47.08	90.84	0.950
1.2	-77.23	112.78	0.974
1.4	-171.73	210.29	0.955
1.6	-675.30	635.16	0.974

表3 式（6）的线性拟合参数

Table 3 Linear fitting parameters of Eq. （6）

当量比φ	斜率f	截距e	拟合度R²
0.6	733.07	110.70	0.958
0.8	84.61	85.63	0.962
1.0	51.30	71.76	0.957
1.2	87.12	64.05	0.967
1.4	280.49	71.31	0.942
1.6	1221.68	28.90	0.966

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