中文摘要：

通过对析液方程和能量守恒方程的耦合，建立了吹气法生产泡沫铝过程中泡沫铝合金析液与凝固过程的一个数学模型，计算了铝合金体积分数和温度在泡沫铝合金凝固过程中随时间、空间的变化．从数值模拟角度对粘度、表面张力和重力加速度等参数对凝固过程的影响进行了定量分析。模拟结果表明：在干泡沫凝固过程中，析液过程和凝固过程是相互作用的，凝固时间以及凝固后固体体积分数的分布与熔体泡沫析液现象有直接关系．熔体物性参数和生产环境对凝固时间和泡沫的孔隙率有较大影响．

英文摘要：

A mathematical model for drainage and solidification processes of foam aluminum alloy fabricated by gas injection into melt is presented based on the coupling of the foam drainage equation and the energy equation. The time evolution and spatial distribution of the aluminum alloy volume fraction and temperature during the solidification process are numerically predicted. Effects of relevant parameters, such as viscosity, surface tension and gravity acceleration, are discussed. Computational results show that foam drainage and solidification are two closely coupled and interactive processes, solidification time and volume fraction distribution after solidification have direct effect on melt foam drainage, and that the melt properties have significant influences on the solidification time and foam porosity.