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可燃气体在运输、储存、加工和使用过程中，因可燃气体泄漏而形成的气云爆炸事故，常常会造成巨大的人员伤亡和财产损失。研究气云爆炸的特性和威力，可防范事故，减小损失。中采用有限差分方法编制了求解可燃气云爆炸过程的定解方程的数值模拟程序。方程组中的源项由能量均匀加入法处理，爆炸场中的间断问题通过人工黏性模型处理。经开敞空间乙炔——空气气云爆炸实验结果检验，数值计算结果的偏差在13％以内。计算结果表明，气云半径越大，爆炸最大压力和压力增加速率越大；气云爆热越大，爆炸最大压力和压力增加速率越大。

Numerous Simulation of Semispherical Flammable Gas Cloud Explosions

During transportation,storage,processing,and utilizing of flammable gas,explosion accidents of gas cloud caused by leakage of the gas often cause severe person injuries and great property loss.The features and power of gas cloud explosions are investigated to prevent the accidents and decrease the loss.With the finite difference method,a numerous simulation program has been worked out to solve the control equations for the explosion process of flammable gas clouds.The source item of the equations is treated by means of even energy addition model,and the disconnection in the explosion field is coped with artificial viscosity model.According to the explosion experience of acetylene-air clouds in the open space,the deviations of numerous calculation results are not more than 13%.The calculation results indicate that the explosion pressure and the rate of pressure-rise increase with the cloud radius and the explosion reaction heat.