State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
J Hazard Mater. 2017 Jul 15;334:59-67. doi: 10.1016/j.jhazmat.2017.03.065. Epub 2017 Apr 1.
Numerical simulations were performed to study explosion characteristics of liquefied petroleum gas (LPG) explosion in enclosure with a vent. Unlike explosion overpressure and dynamic pressure, explosion temperature of the LPG-air mixture at a given concentration in a vented enclosure has very little variation with obstacle numbers for a given blockage ratio. For an enclosure without obstacle, explosion overpressures for the stoichiometric mixtures and the fuel-lean mixtures reach their maximum within the vent and that for fuel-rich mixture reaches its maximum beyond and near the vent. Dynamic pressures produced by an indoor LPG explosion reach their maximum always beyond the vent no matter obstacles are present or not in the enclosure. A LPG explosion in a vented enclosure with built-in obstacles is strong enough to make the brick and mortar wall with a thickness of 370mm damaged. If there is no obstacle in the enclosure, the lower explosion pressure of several kPa can not break the brick and mortar wall with a thickness of 370mm. For a LPG explosion produced in an enclosure with a vent, main hazards, within the vent, are overpressure and high temperature. However main hazards are dynamic pressure, blast wind, and high temperature beyond the vent.
进行了数值模拟，研究了通风外壳中液化石油气（LPG）爆炸的爆炸特性。与爆炸超压和动压不同，在给定的通风外壳中给定浓度的 LPG-空气混合物的爆炸温度，对于给定的阻塞比，障碍物数量的变化很小。对于没有障碍物的外壳，对于化学计量混合物和贫燃料混合物的爆炸超压在通风口内达到最大值，而对于富燃料混合物的爆炸超压在通风口之外和附近达到最大值。室内 LPG 爆炸产生的动压总是在通风口之外达到最大值，无论外壳内是否有障碍物。通风外壳内内置障碍物的 LPG 爆炸足以损坏厚度为 370mm 的砖和砂浆墙。如果外壳内没有障碍物，几个 kPa 的较低爆炸压力不能破坏厚度为 370mm 的砖和砂浆墙。对于通风外壳中产生的 LPG 爆炸，通风口内的主要危险是超压和高温。但是，通风口外的主要危险是动压、冲击波和风和高温。
