拉速对小方坯结晶器液面波动影响的数值模拟

利用流体力学软件Fluent建立180 mm×180 mm铸坯结晶器内"钢-渣"两相流模型,对结晶器液面波动行为进行数值模拟,研究浸入式水口自结晶器中心位置偏离量(0~30 mm)和拉速(2.0~3.0 m/min)对结晶器液面波动行为的影响。发现在相同浸入式水口偏离量下增加拉速,钢液面波动的整体趋势增加,且偏移量与拉速越大,液面波动增幅越大;低拉速时,波谷出现在水口边缘,水口周围剧烈波动;高拉速时,波谷出现在结晶器右壁面,使得钢液液面波动加剧,容易产生卷渣。

Numerical Simulation of Effect of Casting Speed on Level Fluctuation of Liquid in Billet Mold

With using established "liquid-slag" two phase flow model in mold for 180 mm x 180 mm billet by fluid mechanics software Fluent, the numerical simulation on behavior of liquid level fluctuation is carried out to study the effect of deviation distance of submerged nozzle from mold center (0 ~ 30 mm) and casting speed (2. 0 ~3. 0 m/min) on behavior of level fluctuation of liquid in mold. It is found that at same deviation distance of submerged nozzle, with increasing the casting speed, the trend of the whole for liquid level fluctuation increases, and the more of deviation distance and casting speed, the more of increment of liquid level fluctuation ； at low casting speed, the wave troughs occur at edge of nozzle with violent fluctuations around nozzle outlet; at high casting speed, the wave troughs occur at right wall of mold to intensify the liquid level fluctuation and easily form slag entrapment.