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Dynamics of explosion venting in a compartment with methane-air mixtures
Journal of Loss Prevention in the Process Industries ( IF 3.5 ) Pub Date : 2020-08-05 , DOI: 10.1016/j.jlp.2020.104230
Furkan Kodakoglu , Hamed Farmahini Farahani , Ali S. Rangwala , V'yacheslav Akkerman

A series of experiments on explosion venting of methane-air mixtures are performed to scrutinize the pressure evolution as well as the flame dynamics and morphology at various vent conditions. Specifically, a premixed flame is ignited at the center of a polycarbonate cylindrical compartment, with three various vent areas considered (with negligible vent relief pressure). As expected, the highest maximum pressure is observed in the case of the smallest vent area. For all three cases, the pressure evolution experiences two major peaks, associated with the instants (i) when the maximum flame front surface area in the chamber is reached and (ii) when an external explosion occurs due to venting of unburned gases, respectively. For the fuel-rich mixtures, a flashback is observed subsequent to the external explosion, constituting the key outcome of the present work. The flame tip velocities show two general trends, namely, exponential acceleration towards the vent, while a flame propagates towards the blocked side of the compartment with no acceleration, which is important to know in the fire/explosion safety applications.



中文翻译:

甲烷-空气混合物在车厢内爆炸的动力学

进行了一系列甲烷-空气混合物爆炸排放的实验,以检查各种排放条件下的压力演变以及火焰动力学和形态。具体来说,在聚碳酸酯圆柱隔室的中心点燃预混火焰,其中考虑了三个不同的排气区域(排气安全压力可忽略不计)。如预期的那样,在最小的排气口情况下观察到最高的最大压力。对于所有这三种情况,压力的演变经历两个主要的峰值,分别与(i)达到室内最大火焰前表面积和(ii)由于排出未燃烧气体而发生外部爆炸的瞬间有关。对于富含燃料的混合物,在外部爆炸之后会观察到反燃,构成当前工作的关键成果。火焰尖端速度显示出两个总体趋势,即朝着通风口的指数加速,而火焰则朝着隔室的被阻塞侧传播而没有加速,这在防火/爆炸安全应用中很重要。

更新日期:2020-08-05
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