A mathematical model, considering the inner and outer fields of explosion vessels, was introduced to explore the induced mechanism of high explosion-vented pressures and the characteristics of flame and pressure transmission in spherical vessels. Based on the conversation equations for hydrodynamics and chemical reaction dynamics, by adopting the k-e turbulent model and the EBU-Arrhe-nius combustion model, the SIMPLE algorithm was used to investigate numerically the methane-air premixed gas vented explosion process in the two-dimensional space of the spherical vessel with a conduit for explosion venting. The characteristics of flame and pressure transmission and gas flow in the process of vented explosion were obtained which could reflect the dynamics of gas explosion. The turbulent combustion appearing in the process of vented explosion accelerates the transmission of the combustion flame. Venting explosion conduits confines seriously the high-pressure gas venting from vessels.%为了得到球形容器内可燃气体的泄爆强度产生机理以及燃烧火焰与压力传播的基本规律,从流体力学和化学反应动力学守恒出发,采用k-ε湍流模型和EBU-Arrhenius燃烧模型.利用SIMPLE算法对带泄爆导管的球形容器二维空间内甲烷-空气预混气体的泄爆过程内外场进行了数值计算,获得了气体燃烧过程中火焰和压力传播特性以及气体流动特性,能够比较清晰地反映泄爆的整个过程.研究表明,燃烧火焰在泄爆过程中发生湍流,传播得到了极大的加速,泄爆导管对于容器内的高压气体泄放有很大的约束作用.
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