Experimental Study on the Strain Law of the Thin-Walled Pipe in the Gas Explosion Process with Different Ignition Energies
doi: 10.11858/gywlxb.2016.03.004
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摘要: 点火能量是管道内可燃气体爆炸的重要影响因素。实验采取末端闭口的管道，利用传感器以及数据采集系统测定各测点处的压力及压力波作用对管壁的动态响应，研究不同点火能作用下管道内甲烷-空气预混气体的火焰传播特性，并对管壁的动态应变进行了初步分析。结果表明，点火能量越大，爆炸反应程度越剧烈，管道内最大爆炸压力就越大，管壁的最大动态应变也越大，并且动态应变信号和压力波信号呈现较好的一致性。研究结果为预防管道内可燃气体爆炸事故提供了理论基础。Abstract: Ignition energy plays an important role in combustible gas pipeline explosion.The experiments utilized sensors and the data acquisition system to determine measuring point pressures and explore pressure wave effects on the dynamic response of the thin-wall in the closed pipe. This study investigates the characteristics of the methane-air premixed gas flame propagation under different ignition-energy conditions, and carries on preliminary analyses of the dynamic strain of the thin-walled pipe. The results show that the increase of the ignition energy gives rise to the increase of explosive intensity, the maximum peak pressure and the dynamic strain of the thin-wall pipe in the whole process.In addition, there is still a good consistency between dynamic strain signals and pressure wave signals.These findings can provide a theoretical support for preventing gas explosion accidents in pipelines.
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Key words:
- detonation tube /
- ignition energy /
- peak pressure /
- dynamic strain
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Figure 1. Sketch map of experimental setup
1.Ignition electrode, 2.Igniter, 3.Premix gas tank, 4.Compressor, 5.Methane gas cylinders, 6.Visual window, 7.Data logger 8.Monitor
Figure 4. Measured peak pressures versus distance history under different ignition energy
Figure 5. Pipeline pressure signals and thin-walled strain signals under different ignition energy
Table 1. Distribution of sensors on the blast pipe
Sensor No. Sensor type Distance from the firing end/(m) S1 Pressure 1.0 S2 Pressure 2.5 S3 Pressure 4.5 S4 Pressure 6.5 S5 Pressure 8.0 S6 Pressure 10.0 S7 Strain 6.5 S8 Strain 8.0 
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