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为了解尺寸对球形容器连接管道甲烷-空气混合物爆炸的影响规律,利用Fluent软件,采用κ-ε湍流模型、涡耗散模型(简称EDC模型)、壁面热耗散、热辐射模型及SIMPLE算法,建立了球形容器连接管道内甲烷-空气混合物爆炸的数值模型,对容器与管道内甲烷-空气预混气体爆炸的尺寸效应进行了数值模拟。结果表明:随管道内径增大,球形容器内最大爆炸压力逐渐增大,管道末端最大爆炸压力变化无明显规律;而随管道长度增加,球形容器内最大爆炸压力逐渐减小;改变管道内径,较大体积球形容器内最大爆炸压力均大于较小体积球形容器内最大爆炸压力,最大爆炸压力上升速率的规律则相反,容器体积对管道末端最大爆炸压力的影响无明显规律。
In order to understand the influence of size on the explosion of methane-air mixture in a spherical container, Fluent software, κ-ε turbulence model, eddy dissipation model (EDC model), wall heat dissipation, heat radiation model and SIMPLE algorithm were used to simulate the explosion of methane- A numerical model of the explosion of methane-air mixture in a spherical container connecting pipe was established. The size effect of the explosion of methane-air premixed gas in the container and pipeline was numerically simulated. The results show that with the increase of the pipe diameter, the maximum explosion pressure in the spherical vessel gradually increases and the maximum explosion pressure at the pipe end has no obvious change. With the increase of the pipe length, the maximum explosion pressure in the spherical vessel decreases gradually. The maximum explosion pressure in a large-volume spherical vessel is larger than the maximum explosion pressure in a small-volume spherical vessel, and the law of the maximum explosion pressure rise rate is opposite. The influence of the vessel volume on the maximum explosion pressure at the pipe end has no obvious regularity.