Abstract Experiments were conducted in a 2 m large duct with an internal diameter of 70 mm, to investigate the effects of the vent area and ignition position on pressure oscillations with different methane concentrations. The results showed that violent pressure oscillations occurred when methane concentrations were between 9.5 and 12 vol. % in the closed duct. End ignition was shown to dampen the pressure oscillations to a significant extent. In addition, vented explosions could also reduce the pressure oscillations where the amplitude of the pressure oscillations decreases with increasing vented area. For a vent area of 38.5 cm2, no pressure oscillations occurred in all tests. Central ignition produced the larger pressure peak only when the vent area was small.

中文翻译：

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通风口面积和点火位置对大长径比管道压力波动的影响

摘要 在内径为70 mm的2 m大风管中进行实验，研究了不同甲烷浓度下排气口面积和点火位置对压力波动的影响。结果表明，当甲烷浓度在 9.5 和 12 vol 之间时，会发生剧烈的压力振荡。% 在封闭管道中。显示端部点火在很大程度上抑制了压力振荡。此外，排气爆炸还可以减少压力振荡，其中压力振荡的幅度随着排气面积的增加而减小。对于 38.5 cm2 的通风口面积，在所有测试中都没有发生压力波动。只有当排气口面积较小时，中心点火才会产生较大的压力峰值。