结晶器与铸坯间气隙内液态保护渣流动行为的数学解析

Numerical Calculation on the Flowing Behaviour ofMold Fluxes between Mold and Shell

应用粘性流体动力学原理及有限差分方法，对结晶器与铸坯间气隙内的液态保护渣流动行为进行了数值计算，分析了结晶器振动参数对液渣流动行为的影响。结果表明，液渣在一个振动周期内流入、流出状态和流动速度与结晶器振动参数有关。低振幅、低频率使液渣平均流动速度提高。为满足渣耗量，高速连铸工艺应采用低振幅、低频率的正弦波或非正弦波振动形式。

Based on viscous fluid dynamics theory, the flowing velocity and behavior of mold fluxes have been computed by means of finite difference method. The influence of oscillation on its flowing behavior has been analysed. The results show that states of flowing in and out and velocity of molten slag in an oscillation cycle have something to do with mold oscillation parameter. Lower amplitude and frequency make the mean velocity of molten slag increase. In order to achieve sufficient slag consumption, the oscillation mode used in high speed casting should be sinusoidal wave with lower amplitude and frequency or nonsinusoidal wave.