中文摘要：

应用计算流体力学方法模拟分析搅拌轴斜置情况下泡沫铝吹气发泡过程.在双流体模型基础上引入多重参考系法描述搅拌三维气液两相流场,考查了桨叶转速、气体流率及初始泡径对流场特性和气泡分布的影响.结果表明气体在叶片区有聚集,并且吸力面高于压力面,液面附近气泡在一定范围内分布较均匀.含气率随叶片转速和气体流率增大而增大,随气泡直径减小而增大.

英文摘要：

Production process of aluminum foams by air and by mechanical stirring the melt has been investigated, injecting A cting into mohen aluminum composites two fluid model, incorporated with the multi-reference frame （MRF） method, is used to predict the three-dimensional gas-liquid flow in a vessel, in which a stirring axis is positioned inclined into the molten aluminum. Influences of impeller rotational speed, gas flow rate and bubble diameter on the characteristics of the liquid flow field and gas fraction distributions are examined. Computational results show that bubbles accumulate behind impeller blades with absorption surface higher than compression surface and have a rather uniform distribution near the surface of liquid. Gas holdup values are increased with increasing the impeller speed and gas flow rate and decreased with the decreasing of bubble diameter