【摘要】 为了研究瓦斯爆炸过程中压力、温度等参数变化规律,利用Simtec软件并基于大涡模型模拟研究了壁面辐射系数分别为0. 9、0. 1条件下密闭近球体容器中甲烷体积分数为6%～14%时的预混气体爆炸过程,并将模拟结果与已发表的实验结果进行对比。结果表明:当壁面辐射系数为0. 1时,模拟结果与实验结果吻合性较好;爆炸压力、温度先迅速增高而后下降,其中温度震荡缓慢下降;最大爆炸超压和最大压力上升速率在峰值左侧呈正相关关系,在峰值右侧呈负相关关系。更多还原

【Abstract】 In order to study the change of pressure,temperature and other parameters during gas explosion,using Simtec software and based on the large eddy model simulation,the premixed gas explosion process was studied when the volume fraction of methane in the closed near-sphere container was from 6% to 14% under the condition that the wall radiation coefficient was0. 9 and 0. 1 respectively,the simulation results were compared with the published experimental results. The results show that the simulation results are in good agreement with the experimental results when the wall radiation coefficient is 0. 1; the explosion pressure and temperature first increases rapidly and then decreases,the temperature decreases slowly and fluctuatedly;there is a positive correlation between the maximum explosive overpressure and the maximum pressure rising rate on the left side of the peak and a negative correlation on the right side of the peak.更多还原