铝锂合金流动性及其数值模拟的研究

A Numerical Simulation to the Flowability of Molten Al-Li Alloy

采用石墨型真空浇注，对铝锂合金的流动性进行正交试验，找出了影响铝锂合金流动性的主要因素。基于伯努利方程和能量方程，模拟了铝锂合金液在条形试样中流动的速度、温度场分布及流动长度；采用体积函数法（ＶＯＦ法），将流场和温度场耦合计算，不仅模拟了二维速度场和温度场，而且模拟了流动停止过程，为预测和防止冷隔、浇不足等缺陷提供了理论依据。

By maens of or thogonal experiments, the flowability of Al-Li alloy in graphit moldunder vaccum condition is measured, the principal influencing factors are obtained.Based on Benulli equation and energy equation,the vilocity,temperature field and the flowing lenth of Al-Lialloy filling in bar-shape are simulated with computer. Using Volume of Fluid(VOF)method,combining the fluid flow and heat transfer, the computor simulates not only the two dementionalvelocity field and temeprature field, but also the flowing stoping process,providing the theory ofpredicting and preventing defacts such as shot run, cold shut and so on.