柔性障碍物对甲烷空气爆炸波激励作用的实验研究

张延炜; 徐景德; 胡洋; 田思雨; 冯若尘; 秦汉圣

doi:10.11883/bzycj-2020-0144

柔性障碍物对甲烷空气爆炸波激励作用的实验研究

doi: 10.11883/bzycj-2020-0144

华北科技学院安全工程学院，河北廊坊 065201

基金项目: 国家自然科学基金（51874134，51374108）；“十三五”国家重点研发计划（2016YFC0801502）；华北科技学院中央高校基本科研业务费项目（3142018017）

详细信息

作者简介:
张延炜（1996－　），男，硕士研究生，zywtime@163.com

通讯作者:
徐景德（1965－　），男，博士，教授，xujd1430@126.com

中图分类号: O381
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- 文章访问数: 525
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-11
- 修回日期: 2020-06-22
- 网络出版日期: 2021-04-21
- 刊出日期: 2021-05-05

Experimental study on incentive effect of flexible obstacle on methane-air explosion wave

College of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, Hebei, China

摘要

摘要: 为研究柔性障碍物对甲烷空气爆炸波的激励效应，采用双向拉伸聚丙烯（biaxially oriented polypropylene, BOPP）薄膜作为柔性障碍物将管道内甲烷空气预混气体与空气隔开，对比障碍物前后火焰、激波变化，分析膜状柔性障碍物激励效应的机理。实验结果表明：这种具有一定承压能力的柔性障碍物对甲烷爆炸波产生的激励效应不可忽视，在膜片破裂前产生多次激波反射过程，可诱导湍流火焰形成，促使膜前爆炸压力提高，膜片破裂后，火焰在伴流作用下传播速度突增，并加速逐渐逼近前驱冲击波，致使膜后爆炸压力大幅提高；激励效应可使膜片前后最大爆炸压力相差5倍，火焰速度相差7倍；另外在膜片位置2.5 m后增设一道膜片，可增强这种激励效应，而增加膜片的实质是使激波火焰相互作用的次数增加。
- 甲烷空气爆炸 /
- 柔性障碍物 /
- 激励效应 /
- 激波
Abstract: In order to study the incentive effect of flexible obstacles on methane-air explosion waves, a biaxially oriented polypropylene ( BOPP) film was used as a flexible obstacle to separate the methane-air premixed gas from the air in the pipeline, the difference of the flame and shock wave before and after they propagated through the obstacle was compared, and the mechanism of the incentive effect of the flexible membrane obstacle was analyzed. The experimental results show that the incentive effect of this flexible obstacle with certain pressure-bearing capacity on the methane explosion wave cannot be ignored. Multiple reflections of shock wave before the rupture of the flexible membrane can result in the formation of turbulent flame, and thus greatly increase the explosion pressure. After the rupture of the flexible membrane, the velocity of the flame increases suddenly under the action of the concomitant flow and approaches the shock wave, resulting in a great increase in the explosion pressure behind the membrane. The experimental data show that the difference in the maximum explosion pressure between the locations before and after the membrane is five times and the corresponding difference of flame velocity is seven times. In addition, it is found that the incentive effect can be enhanced by adding an additional membrane after the original one with a prescribed distance and the essential role of the additional membrane is to increase the interaction numbers between the shock wave and the flame.
- methane-air explosion /
- flexible obstacle /
- incentive effect /
- shock wave

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图 1 实验管道

Figure 1. Experimental pipeline

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图 2 实验工况

Figure 2. Experimental conditions

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图 3 运动轨迹示意图

Figure 3. Schematics of shock wave and flame front propagation

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图 4 传感器P₁测得的压力变化

Figure 4. Pressure-time history measured by pressure sensor P₁

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图 5 传感器P₂测得的压力变化

Figure 5. Pressure-time history measured by pressure sensor P₂

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图 6 实验工况Ⅰ下障碍物后压力传感器测得的压力变化曲线

Figure 6. Pressure-time histories measured by different pressure sensors behind obstacle under experimental condition Ⅰ

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图 7 实验工况Ⅱ下压力传感器测得的压力变化曲线

Figure 7. Pressure-time histories measured by different pressure sensors under experimental condition Ⅱ

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表 1 工况Ⅰ下激波特征参数

Table 1. Characteristic parameters for shock wave under experimental condition Ⅰ

压力传感器	激波到达时刻/ms	波阵面位置/m	超压/kPa	激波传播速度/（m·s⁻¹）	马赫数
P₁	66.37	4.50	42.70	396.67	1.12
P₂	74.79	7.84	43.25	396.67	1.12
P₃	197.21	8.95	74.43	424.94 414.59 406.86	1.23 1.23 1.18
P₄	205.07	12.29	70.59
P₅	211.10	14.79	53.07
P₆	215.18	16.45	49.32

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表 2 工况Ⅰ下的火焰特征参数

Table 2. Characteristic parameters for flame under experimental condition Ⅰ

火焰传感器	火焰到达时刻/ms	火焰锋面位置/m	火焰传播速度/（m·s⁻¹）
F₁	165.11	4.50	64.30 211.03 231.62 358.68 538.96
F₂	217.05	7.84
F₃	222.31	8.95
F₄	236.73	12.29
F₅	243.70	14.79
F₆	246.78	16.45
F₇	未出现火焰

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表 3 实验工况Ⅰ下激波振荡部分特征参数

Table 3. Characteristic parameters of shock wave oscillation under experimental condition Ⅰ

激波到达传感器P₁		方向	激波到达传感器P₂		激波传播速度/ （m·s⁻¹）
时刻/ms	超压/kPa	方向	时刻/ms	超压/kPa	激波传播速度/ （m·s⁻¹）
66.37 (a)	41.055	→	74.79 (a′)	42.151	396.67
87.97 (b)	31.252	←	78.84 (b′)	32.897	365.83
105.39 (c)	41.538	→	114.27 (c′)	39.477	376.13
128.00 (d)	29.059	←	118.63 (d′)	33.993	356.46
142.96 (e)	50.991	→	151.59 (e′)	51.539	387.02
165.20 (f)	38.823	←	155.77 (f′)	41.990	354.19
175.91 (g)	25.231	→	184.69 (g′)	37.462	380.41

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表 4 实验工况Ⅱ下的激波特征参数

Table 4. Shock wave characteristic parameters under experimental condition Ⅱ

压力传感器	激波到达时刻/ms	波阵面位置/m	超压/kPa	激波传播速度/（m·s⁻¹）	马赫数
P₁	203.01	8.95	78.34	444.44	1.28
P₂	204.90	9.79	71.78	444.44	1.28
P₃	230.26	12.29	91.41	448.83 439.15 447.60	1.30 1.27 1.29
P₄	235.83	14.79	78.28
P₅	239.61	16.45	66.30
P₆	247.72	20.08	92.12

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表 5 实验工况Ⅱ下的火焰特征参数

Table 5. Flame characteristic parameters under experimental condition Ⅱ

火焰传感器	火焰到达时刻/ms	火焰锋面位置/m	火焰传播速度/（m·s⁻¹）
F₁	247.39	8.95	223.98 301.20 436.30 568.49
F₂	250.98	9.79
F₃	259.28	12.29
F₄	265.01	14.79
F₅	267.93	16.45
F₆	未出现火焰

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