螺旋微通道对掺氢甲烷爆轰传播的影响

doi:10.11949/0438-1157.20230365

摘要/Abstract

摘要：

为探究复杂结构管路中CH₄/H₂二元燃料混合体系爆轰传播特性，研究了在连续弯管（螺旋结构）扰动作用下，CH₄/H₂-O₂混合物的爆轰失效与重新起爆特征行为，利用光电探测技术和烟迹技术获取了不同氢气比例与初始压力下的火焰传播速度与胞格结构变化规律。实验结果表明，螺旋结构对爆轰波的传播存在抑制作用，爆轰火焰通过螺旋管前后的传播过程可以分为加速、减速、重起爆三个阶段。H₂的添加可以有效提高预混气的爆轰敏感性，降低火焰通过螺旋管的速度亏损，当掺氢比超过50%时，减速阶段的速度亏损大幅减小。初始压力的增大同样可以降低火焰的速度亏损，当初压从50 kPa增加到200 kPa，速度亏损减少了40.5%。螺旋管的存在使得重起爆的起爆能量减小，爆轰胞格尺寸增大。

关键词: 氢, 甲烷, 螺旋管, 掺氢比, 安全, 爆轰

Abstract:

To explore the detonation propagation characteristics of CH₄/H₂ binary fuel mixture system in complex structure pipeline, this paper studies the detonation failure and re-initiation characteristic behavior of CH₄/H₂-O₂ mixture under the disturbance of continuous elbow (spiral structure). The variation of flame velocity and cell structure is measured by using photoelectric detection technology and smoke trace technology by varying the hydrogen ratio and initial pressure. The experimental results show that the spiral structure has an inhibitory effect on the propagation of detonation waves. The propagation process of detonation flame before and after passing through the spiral tube can be divided into three stages: acceleration, deceleration, and re-initiation. The addition of H₂ can effectively improve the detonation sensitivity of the premixed gas and reduce the velocity loss of the flame through the spiral tube. When the hydrogen ratio exceeds 50%, the change of velocity loss is less affected by the hydrogen ratio. The increase of initial pressure can also reduce the velocity loss of the flame. As the initial pressure increases from 50 kPa to 200 kPa, the velocity deficit decreases by 40.5%. The existence of the spiral tube reduces the initiation energy of re-initiation and increases the detonation cell size.

Key words: hydrogen, methane, spiral tube, hydrogen ratio, safety, detonation

中图分类号:

X 932

刘晓洋, 喻健良, 侯玉洁, 闫兴清, 张振华, 吕先舒. 螺旋微通道对掺氢甲烷爆轰传播的影响[J]. 化工学报, 2023, 74(7): 3139-3148.

Xiaoyang LIU, Jianliang YU, Yujie HOU, Xingqing YAN, Zhenhua ZHANG, Xianshu LYU. Effect of spiral microchannel on detonation propagation of hydrogen-doped methane[J]. CIESC Journal, 2023, 74(7): 3139-3148.

图/表 16

图1 实验装置图

Fig.1 Experimental apparatus

表1 实验气体组分

Table 1 Experimental gas composition

编号	气体配比	掺氢比/%	H₂摩尔分数/%
1	CH₄-2O₂	0	0
2	3CH₄-H₂-6.5O₂	25	9.5
3	CH₄-H₂-2.5O₂	50	22.2
4	CH₄-3H₂-3.5O₂	75	40.0
5	2H₂-O₂	100	66.7

图2 直管管道与螺旋管管道内火焰速度与CJ速度的比值

Fig.2 The ratio of flame velocity in straight pipe and spiral pipe to CJ velocity

图3 点火端胞格结构变化（CH4-2O2，P0=100 kPa）

Fig.3 Cellular structure change at ignition end ( CH4-2O2, P0=100 kPa)

图4 不同掺氢比下管道中各点V与V/VCJ

Fig.4 V and V/VCJ at each point in the pipeline under different hydrogen doping ratios

图5 减速段速度亏损

Fig.5 Loss of speed in the deceleration section

图6 诱导区长度

Fig.6 Induction zone length

图7 螺旋管内的火焰与波系传播

Fig.7 Flame and wave propagation in the spiral tube

表2 VCJ以及V=0.8VCJ的位置

Table 2 VCJ and the position of V = 0.8VCJ

掺氢比/%	V_CJ/(m/s)	0.8 V_CJ位置/mm
0	2390.2	3074.6
25	2424.0	3036.1
50	2476.9	3042.7
75	2577.0	2972.2
100	2836.3	544.4

图8 爆轰胞格

Fig.8 Detonation cell

图9 3CH4-H2-6.5O2在不同初始压力下的V和V/VCJ

Fig.9 V and V/VCJ of 3CH4-H2-6.5O2 under different initial pressures

图10 3CH4-H2-6.5O2在不同初始压力下的ΔV

Fig.10 ΔV of 3CH4-H2-6.5O2 under different initial pressures

图11 不同初压下重起爆位置

Fig.11 The position of re-initiation under different initial pressures

图12 爆轰胞格

Fig.12 Detonation cell

图13 不同掺氢比下胞格尺寸随初始压力的变化

Fig.13 Change of cell size with initial pressure at different hydrogen-blending ratios

表3 爆轰胞格尺寸λ与初始压力P0之间的拟合关系参数

Table 3 Fitting relationship parameters between detonation cell size λ and initial pressure P0

掺氢比/%	C/mm	b
0	46.87	0.39
25	130.55	0.70
50	81.73	0.69
100	53.47	0.65

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