7050铝合金施加超声铸造的数值模拟

Numerical Simulation for 7050 Aluminum Alloy Cast with Ultrasonic Treatment

利用流体力学软件Fluent及动网格技术,以多相流模型中的混合物模型(Mixture)为基础,并耦合空化模型,对不同功率超声作用下7050铝合金熔体所产生的空化效应及铸造组织进行了数值模拟,并通过超声铸造试验进行了验证。结果表明:随着超声时间的延长,熔体中的空化区域逐渐扩大,并逐步向变幅杆端面中心集中;超声功率越大,空化强度越高,对铸态组织的细化效果越明显;模拟结果与试验结果基本吻合。

Using the mixture model and the cavitation model of Fluent, the ultrasonic cavitation effect and cast microstructure at different ultrasonic powers for 7050 aluminum alloy melt was simulated, and then was analysed through casting experiment with ultrasonic treatment（UST）. The results show that the cavitation region in melt expanded gradually with the increase of the ultrasonic treatment time, and concentrated on the center of horn surface gradually. The higher the ultrasonic power and cavitation strength were, the refiner the microstructure was. The simulated results matched the experimental results.