Propagation characteristics of flame wave and shock wave during the gas explosion in complex pipeline network
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摘要: 为了进一步探究瓦斯爆炸冲击波火焰波的传播特性，在自行设计并搭建的复杂管网中进行瓦斯爆炸实验。实验中利用高精度压力传感器和温度传感器收集压力变化和温度峰值数据；使用火焰传感器采集爆炸过程中出现的火焰波信号，根据理论公式计算得出火焰波传播速度；利用Origin软件对实验数据进行综合处理，研究复杂管网中瓦斯爆炸时的冲击波、火焰波传播特性。结果表明：管道内各测点最大压力峰值为0.599 MPa，最小压力峰值为0.297 MPa，管道内火焰波速度峰值为214.04 m/s，在管道L4上速度值降低为0 m/s，各测点温度峰值最大值为1 837 K，最小值为1 521 K。随着爆炸冲击波与火焰波在复杂管网内的传播距离不断增大，压力衰减趋势和速度突变趋势更为显著。Abstract: For the purpose of further exploring the flame wave propagation characteristics of the gas explosion shock wave, the gas explosion experiment was carried out in a complex pipe network designed and built by ourselves. In the experiment, a high precision pressure sensor and a temperature sensor were used to collect pressure changes and temperature peak data. By using the flame sensor to collect the flame wave signal in the process of explosion, the flame wave propagation velocity was calculated according to the theoretical formula, and the Origin software was used to comprehensively process the experimental data to study the shock wave and flame wave propagation characteristics of gas explosion in the complex pipe network. The results show that in the pipeline the peak value of maximum pressure and minimum pressure at each measuring point is 0.599 MPa and 0.297 MPa, the peak value of flame wave velocity is 214.04 m/s, and the value of velocity on the pipeline L4 decreases to 0 m/s. The peak value of temperature at each measuring point is 1,837 K and the minimum is 1 521 K. As the propagation distance of the blast wave and flame wave increases in the complex pipe network, the trend of pressure attenuation and velocity mutation becomes more significant.
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Key words:
- gas explosion /
- shock wave /
- flame wave /
- propagation characteristic /
- complex pipe network
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图 3 实验系统各管道及测点
Fig. 3 Schematic diagram of each pipe and measuring point in the experimental system
表 1 各测点等效坐标值
Table 1 Equivalent coordinate values of each measuring point
m 测点 T1 T2 T3 T4 T5 T6 T7 T8 T9 测点坐标 2.2,0 2.8,0 6.8,0 7.4,0.6 2.3,0.6 2.3,2.8 2.8,3.3 6.8,3.3 7.4,2.8 
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表 2 各监测点压力峰值原始实验数据
Table 2 Original experimental data of peak pressure at each monitoring point
管道 测点 距离爆炸源距离/m 压力峰值/MPa 均值/MPa L1 T1 2.2 0.596 0.602 0.589 0.599 T2 2.8 0.562 0.531 0.569 0.564 T3 6.8 0.478 0.472 0.473 0.476 L2 T5 2.9 0.573 0.579 0.568 0.572 T6 5.1 0.512 0.509 0.512 0.515 L3 T4 8.0 0.372 0.376 0.375 0.373 T9 10.2 0.294 0.299 0.298 0.297 L4 T7 6.1 0.419 0.425 0.428 0.423 T8 10.1 0.345 0.341 0.343 0.342
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表 3 冲击波在管网内各测点的压力衰减系数
Table 3 Pressure attenuation factors of the shock wave at each measuring point in the pipe network
冲击波
路线测点 测点与爆炸源距离/m 压力峰
值/MPa衰减系数
kO-A-C-D T1 2.2 0.599 — T5 2.9 0.572 1.058 T6 5.1 0.513 1.115 T7 6.1 0.423 1.214 T8 10.1 0.342 1.237 O-A-B-D T1 2.2 0.599 — T2 2.8 0.564 1.063 T3 6.8 0.476 1.196 T4 8.0 0.373 1.287 T9 10.2 0.297 1.266
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表 4 各监测点火焰锋面到达时间原始实验数据
Table 4 Original experimental data of the arrival time of the flame front at each monitoring point
管道 测点 测点与爆炸源距离/m 火焰到达时间/ms 均值/ms L1 T1 2.2 174.45 179.31 175.94 175.32 T2 2.8 179.13 176.12 179.11 178.12 T3 6.8 208.06 213.32 210.51 210.63 L2 T5 2.9 178.82 177.67 120.21 179.03 T6 5.1 198.88 202.19 203.49 202.01 L3 T4 8.0 247.86 249.73 247.97 248.52 T9 10.2 367.47 368.12 371.41 369.00 L4 T7 6.1 247.07 241.20 247.48 245.25 T8 10.1 — — — —
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表 5 火焰波速度突变系数
Table 5 Flame wave velocity change coefficient
火焰波
路线距离爆炸
源距离/m速度/(m·s−1) 突变
系数γO-A-C-D 2.55 175.42 — 4.0 94.86 0.463 5.6 23.37 0.755 8.1 0 1 O-A-B-D 2.5 214.04 — 4.8 123.04 0.425 7.4 47.5 0.613 9.1 18.26 0.618
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