铝合金熔体旋转喷吹除气净化过程模拟

采用计算机模拟方法对铝合金熔体旋转喷吹除气净化过程的温度场以及流场进行分析。结果表明,在转杆内部放置一个导气管,可以显著降低气体温度,从而可以有效地解决旋转喷头由于熔剂因高温变软而堵塞的问题;旋转速度和进气流量对铝合金熔体旋转喷吹除气净化效果具有重要影响,应该根据具体情况选择合适的工艺参数。熔池为方形结构时,气体主要从对角处出去,而远离对角处的体积分数却显著降低,甚至可能发生吸气。

Simulation of Degassing and Purification Process of Molten Aluminum Alloys by Rotary Impeller

The temperature field and flow field of molten aluminum alloys during degassing and purification process by rotary impeller have been simulated by a computational model. The results indicate that a special pipeline fixed into the rotate pole can remarkably decrease the temperature in the rotate pole and prevent the spinning rotor from jamming resulting from spray flux softening at high temperature. The rotate speed and the flux have the important effects on the degassing and purification of molten aluminum alloys, so appropriate parameters should be considered according to the actual situation. With square furnace, the gas got out in the vertical section along shaft on the cross, while the volume fraction of the gas can be decreased remarkably in vertical section along shaft, even exhibiting hydrogen inhalation.