Experimental study and three-dimensional simulation of premixed combustible gas explosion venting in a rectangular cavity
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摘要: 为了研究大空间内预混可燃气体爆燃泄爆过程中的压力与火焰传播规律，在1.21 m3的方形空间内进行了不同体积分数乙烯气体和两种不同泄压面积的泄爆实验，针对泄压面积为0.18 m2、体积分数为7%的乙烯-空气预混气体爆燃泄爆过程进行了三维数值模拟研究。结果表明：不同泄爆条件下压力形式不同，小面积泄爆口开启后，压力先下降后上升且第2峰值较大，在高体积分数下超过第1峰值，大面积泄爆时第2峰值较小。数值模拟结果与实验得到的压力时程曲线趋势一致，与实验中观察到的外部火焰形态相似；泄爆口开启后引发的湍流效应，使得空间内火焰阵面变形和火焰传播速度显著加快，导致了小面积泄爆第2峰值压力较大。Abstract: In order to investigate the overpressure and flame propagation of premixed combustible gas explosion venting in a large space, experiments of different concentrations of ethylene gas and two different vent sizes have been carried out in a rectangular cavity of 1.21 m3. Meanwhile, three-dimensional numerical simulations have been performed to simulate the ethylene air explosion venting process with a 0.18 m2 vent area and a 7% concentration of ethylene gas. The results show that the overpressure has a different response with different vent size. When the small vent is used, the overpressure drops first and then rises, in which the second peak value is larger than the first one. The turbulence caused by the venting process increases significantly the flame front deformation and the flame propagation speed, resulting in the larger second peak. In contrast, for the large vent size, the second peak is lower. The simulated results are in good agreement with the experimental ones.
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Key words:
- rectangular cavity /
- ethylene gas /
- explosion venting /
- flame propagation
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图 2 0.18 m2泄压面积时不同体积分数压力曲线
Figure 2. Overpressure curves for different volume fractionswith 0.18 m2 vent area
图 3 0.55 m2泄压面积时不同体积分数压力曲线
Figure 3. Overpressure curves for different volume fractionswith 0.55 m2 vent area
图 5 实验与数值模拟的压力曲线
Figure 5. Overpressure curves between experimentaland numerical results
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