铝液在多孔介质中渗流过程的模拟试验研究

An Experimental Investigation of the Simulation of Low-Pressure Infiltration for Molten Aluminium in Porous Medium

选择低压渗流法制备泡沫铝的工艺过程为模拟对象,根据相似原理,在有机玻璃模型中用液体作为流体,对铝液在多孔介质中的低压向上渗流过程进行了模拟试验研究。试验表明,在低压渗流制备泡沫铝的过程中,原型的渗流液面是以平面沿铅垂方向向上推进的,位移和时间的关系满足四次方根规律;渗流过程中某一时间t的雷诺数、阻力系数和沿程损失可用相应的公式计算;渗流过程中,外加渗流气压的最佳值为0.04kPa,高于该值的外加渗流气压对于渗流时间的影响不大。实验还将模拟实验得到的结果与原型进行了比较,模型的充填时间与原型的充填时间一致性良好,证实了本实验结果的正确性。

The technical process of using low-pressure infiltration method to produce porous aluminium alloy was chosen as simulation object, the process of molten aluminium infiltration in porous medium under low-pressure was investigated throught organic transport material simulation based on the principle of similarity. Experiments indicate that the prototype＇s plane surface of infiltrating liquid advances perpendicularly, the relation between its displacement and time conforms to the law of fourth root. At a certain time t, The Reynhold＇s number Re（t）, the resistance coefficient λ （t） and the pressure lose can be calculated by corresponding formulas. It is found that for infiltration method the optimum pressure applied to the molten metal is 0.04kPa, the pressure higher than that value takes little influence on the infiltration time. The filling time in the simulater was compared with that for prototype, both being in good agreement, it approved that the experiment＇s result is right.