泄爆面特征参数对天然气爆炸超压峰值的影响规律

为揭示泄爆面特征参数对大尺度受限空间内天然气爆炸超压峰值结构的影响机制，基于典型房间特征，借助计算流体动力学技术研究不同泄爆面开启压力、开启时间以及泄压比等参数条件下室内天然气泄爆超压峰值结构的分布规律。研究结果表明:峰值Pb随开启压力和开启时间增加均呈线性增长趋势，而泄压比对Pb影响较小；峰值Pmfa与室内最大火焰面积有关，随开启压力、开启时间的增加和泄压比的减小，气体出流速度增大，进而产生更强的湍流，导致室内火焰面积和气体燃烧率增加，最终Pmfa增大；峰值Pext随泄压比增加呈快速降低趋势，同时开启压力和开启时间对Pext影响具有协同效应，共同促进Pext快速增加。

Effect of vent characteristic parameters on overpressure peaks of natural gas explosion

In order to reveal the influence mechanism of the vent characteristic parameters on the peak overpressure structure of the natural gas explosion in the large scale confined space ,based on the characteristics of typical large scale rooms,the distribution law of the peak overpressure structure of indoor natural gas explosion under different vent characteristic parameters such as opening pressure,opening time and pressure relief ratio was studied by means of computational fluid dynamics.The results show that the peak Pb increases linearly with the increase of opening pressure and opening time,but the pressure relief ratio has little effect on Pb.The peak Pmfa is related to the maximum indoor flame area,as the increase of opening pressure,opening time and the decrease of pressure relief ratio,the gas outflow velocity increases,resulting in stronger turbulence,which leads to the increase of indoor flame area and gas combustion rate,and finally the Pmfa increases.The peak Pext rapidly decreases with the increase of pressure relief ratio.And the opening pressure and opening time have a synergistic effect on Pext,which jointly promote the rapid increase of Pext.