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Thermodynamic Model for Gas Explosions in Vented and Non-Vented Enclosures

机译：通风和非通风外壳中气体爆炸的热力学模型

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摘要

A computer model capable of predicting the thermodynamic properties that occur inside a rigid container during both a non-vented or vented gas explosion is described. The model applies the conservation of mass, energy, and momentum of the combustion gases and the motion of a rigid mass that covers an opening to the enclosure. The computer model differs from others examining similar problems by using a complete energy equation applied to the combustion gases and it includes temperature and pressure varying properties and heat transfer from combustion zone to the enclosure. The fundamental equations are non-dimensionalized resulting in two dimensionless groups that can be used to design an enclosure that will control or mitigate the effects of an explosion. Model results are compared with available experimental measurements of enclosure pressures for vented and non-vented explosions. The model closely predicts the transient pressure rise for explosions of hydrogen, methane, and mixtures of those two gases in a wide range of gas concentrations and for a variety of vessel and vent geometries.
机译：描述了一种计算机模型，该模型能够预测在非排气或排气爆炸期间在刚性容器内部发生的热力学性质。该模型应用了燃烧气体的质量，能量和动量守恒以及覆盖外壳开口的刚性质量的运动。该计算机模型不同于其他模型，它通过使用适用于燃烧气体的完整能量方程式来研究类似的问题，它包括温度和压力变化特性以及从燃烧区到外壳的热传递。基本方程是无量纲的，从而产生两个无量纲的组，可用于设计将控制或减轻爆炸影响的外壳。将模型结果与已排气和未排气爆炸的围护压力的可用实验测量值进行比较。该模型可以密切预测氢气，甲烷以及两种气体在各种气体浓度范围内的爆炸以及各种容器和通风口几何形状的爆炸所引起的瞬态压力升高。

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