Based on the governing equations of fluid mechanics,Realizable model and Eddy-Dissipation combustion model,the theoretical models of flammable vapor explosion was established.In this paper,the coupled solve was adopted to simulate the three-dimensional model of acetylene-air,which the radial is 0.5 m.Taking the premixed gas which the mass fraction were 5.3％,10.4％,13.3％ and 15.4％ to get the over pressure distributions of vapor cloud with time and space.Comparing the max explosion pressure with experimental dates,the maximum deviation of calculation results are 13.79％.The result show that the maximum explosion pressure occurs in the early cloud explosion,and decreasing quickly over the time.In the short term,there is a periodic over pressure wave in the outward diffusion.In addition to,the explosion pressure is biggest when come to the most dangerous mass fraction.In the production industry,we should try to avoid the most dangerous gas concentration reaching its dangerous mass fraction,and preventing the occurrence of accidents.%基于流体力学控制方程组、Realizable湍流方程和Eddy-Dissipation燃烧模型,建立了可燃气云爆燃的理论模型,对半径为0.5m的半球形乙炔-空气预混爆炸进行了三维数值模拟,并采用了密度基耦合求解器进行了数值求解.选取了乙炔质量分数分别为5.3％、10.4％、13.3％和15.4％的预混气体,并得到不同质量分数的混合气云爆炸超压沿时间与空间的分布,模拟得到最大爆炸压力与实验结果吻合良好,最大相对偏差为13.79％;在气云爆炸初期,爆炸压力急剧增加,达到最大爆炸压力,在短期内有周期性的超压波不断向外扩散,且当气体浓度处于最危险质量分数时,产生的爆炸压力最大.在工业生产中,应尽量避免气体浓度达到其最危险质量分数,从而预防事故的发生.
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