机械搅拌流场中制备闭孔泡沫铝过程的数值模拟  

Numerical Simulation of Producing Aluminum Foam by Air Injecting and Melt Stirring

作　　者：刘红[1] 解茂昭[1] 王德庆[2] 

机构地区：[1]大连理工大学动力工程系,辽宁大连116024 [2]大连交通大学材料系,辽宁大连116024

出　　处：《过程工程学报》2007年第1期34-38,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50371013)

摘　　要：描述了机械搅拌条件下应用吹气发泡法制备新型功能材料闭孔泡沫铝的过程.在双流体模型基础上,引入多重参考系法预测水平轴机械搅拌池内的气液两相流动.应用RNGk-ε模型模拟湍流效应,考察了桨叶转速及孔口气速对流场特性和局部气含率的影响,进而应用体积积分的方法预测平均气含率.计算结果表明,预测结果与文献中的实验数据定性一致.Production of aluminum foam by air injecting into molten aluminum composites under mechanical stirring has been investigated. A two-dimensional computational two-fluid model incorporated with the multi-reference frame method is used to predict the gas-liquid flow in a horizontally axial stirred vessel. Turbulence effect is simulated with a RNG k-e model. The influences of gas inlet velocity and impeller rotational speed on bubble rising velocity and local gas volumetric fraction are examined. Furthermore, volumetric average of total gas fraction is predicted by volume integration. Computational results show a qualitative agreement with experimental data from the literature.

关 键 词：泡沫铝 多重参考系法 气液两相流 数值模拟 气含率 搅拌箱 

分 类 号：TU51[建筑科学—建筑技术科学] TK121[动力工程及工程热物理—工程热物理]