预混气体爆炸火焰与压力的耦合振荡特性

doi:10.11949/0438-1157.20190070

摘要/Abstract

摘要：

为研究预混气体爆炸火焰和压力的耦合振荡特性，自行搭建了尺寸为80 mm×80 mm×1000 mm透明有机玻璃爆炸管道实验平台。实验结果表明，在氧气浓度E和泄爆面积比S变化的条件下，会对CH₄/O₂/N₂预混气体爆炸火焰与压力的耦合振荡产生影响。当氧气浓度E从0.21到0.40变化时，火焰传播时间逐渐缩短，火焰结构发生动态演变，火焰后期的振荡现象愈加明显，同时测到的压力曲线在后期也存在振荡增强现象；当泄爆面积比S从0.125到1.000变化时，E=0.21工况下S=0.125和S=0.250两个工况与其他工况的压力曲线有所不同，出现了一个更高的压力峰值，E=0.30工况下S=0.125也出现了新的压力峰值，E=0.30和E=0.40两种工况的压力峰值都逐渐减小，压力后期的振荡幅值与泄爆面积比有关。

关键词: 预混气体, 爆炸, 火焰, 压力, 振荡

Abstract:

To study the coupling oscillation characteristics of the explosion flame and pressure of premixed gas, a transparent plexiglass explosive pipeline experimental platform with dimensions of 80 mm×80 mm×1000 mm was built. The results show that the coupling oscillation of CH₄/O₂/N₂ premixed gas explosion flame and pressure will be affected under the condition that the oxygen concentration E and the detonation area ratio S change. When the oxygen concentration E changes from 0.21 to 0.40, the flame propagation time decreases gradually, the flame structure evolves dynamically, the oscillation phenomenon in the later flame is more obvious, and the oscillation enhancement phenomenon also exists in the later stage of the measured pressure curve. When the detonation area changes from 0.125 to 1.000, the pressure curves of S=0.125 and S=0.250 under E=0.21 conditions are different from those of other working conditions, a higher pressure peak is observed, and new pressure peaks appear in S=0.125 under E=0.30 conditions, and the peak pressure of E=0.30 and E=0.40 two kinds of working conditions decreases gradually, the oscillation amplitude in the later stage of pressure is related to the explosion area ratio.

Key words: premixed gas, explosion, flame, pressure, oscillation

中图分类号:

TD 712

时高龙, 温小萍, 王发辉, 裴蓓, 潘荣锟, 刘志超, 陈卫. 预混气体爆炸火焰与压力的耦合振荡特性[J]. 化工学报, 2019, 70(7): 2811-2818.

Gaolong SHI, Xiaoping WEN, Fahui WANG, Bei PEI, Rongkun PAN, Zhichao LIU, Wei CHEN. Coupling oscillation characteristics of premixed gas explosion flame and pressure[J]. CIESC Journal, 2019, 70(7): 2811-2818.

图/表 14

图1 实验装置

Fig.1 Experimental setup

表1 实验条件

Table 1 Experimental conditions

工况	E	CH₄ content/%(vol)	O₂ content/%(vol)	N₂ content/%(vol)
1	0.21	9.50	19.00	71.50
2	0.30	13.70	27.40	58.90
3	0.40	16.70	33.30	50.00

图2 不同氧气浓度条件下火焰结构演变过程

Fig.2 Evolution of flame structure under different oxygen concentrations

表2 不同氧气浓度条件下火焰传播主要参数的计算值

Table 2 Calculated values of main parameters of flame propagation under different oxygen concentrations

参数	E=0.21	E=0.30	E=0.40
U_L/(m/s)	0.414	0.981	1.367
R/cm	5.65	5.65	5.65
t_o/ms	0	0	0
t_sphere/ms	10.92—16.37	4.61—6.91	3.31—4.96
t_wall/ms	32.75—38.21	13.82—16.12	9.92—11.57
t_tulip/ms	42.23—45.76	17.85—20.15	12.81—14.46

图3 火焰传播后期的振荡现象

Fig.3 Oscillations in later stages of flame propagation

图4 火焰振荡的流场分析

Fig.4 Analysis of flame oscillating flow field

图5 氧气浓度E=0.21的超压曲线

Fig.5 Overpressure curve of oxygen concentration E=0.21

图6 氧气浓度E=0.30超压曲线

Fig.6 Overpressure curve of oxygen concentration E=0.30

图7 氧气浓度E=0.40超压曲线

Fig.7 Overpressure curve of oxygen concentration E=0.40

图8 氧气浓度对超压峰值的影响

Fig.8 Effect of oxygen enrichment coefficient on peak value of overpressure

图9 E=0.21时不同泄爆口对爆炸超压的影响

Fig.9 Effect of different blasting ports on explosion overpressure at E=0.21

图10 E=0.30时不同泄爆口对爆炸超压的影响

Fig.10 Effect of different blasting ports on explosion overpressure at E=0.30

表3 压力振荡参数

Table 3 Pressure oscillation parameters

工况	S	T₁/ms	A₁/kPa	T₂/ms	A₂/kPa
1	1.000	1.78×10^-3	3.00	2.89×10^-3	25.00
2	0.750	2.83×10^-3	2.00	1.71×10^-3	5.00
3	0.500	1.67×10^-3	1.00	1.73×10^-3	2.50
4	0.250	1.77×10^-3	0.80	1.1×10^-3	2.00
5	0.125	1.67×10^-3	0.20	1.25×10^-3	0.25

图11 泄爆口面积比S对超压峰值的影响

Fig.11 Effect of blasting ports area ratio S on overpressure peak

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