摘要
对中间包内流场进行了模拟研究和测定,测得有上下挡墙和没有挡墙两种工况下完整的速度矢量分布。高速摄影观察表明,下降的钢流进入溶池后吸收周围液体形成扩张角为10°-12°的液-液射流。射流以较大速度冲击包底形成四周放射的扩张流,它是中间包内钢流流动的动量源。下挡墙能阻止底部液流,改变流动方向。对于水口上方出现旋涡漏斗的临界高度也进行了模拟实验研究,发现上升过程和下降过程的临界高度值不相同。
A tundish is an intermediate vessel used in the continuous casting process for the manufacture of steel. The fluid flow phenomena in the tundish have strong influence not only on uniformity of composition and temperature, but also on separation of nonmetallic inclusions. Data on the fluid flow is lacking and systematic measurements are desired. In this work the fluid flow in the bath of a rectangular tundish was studied experimentally in a model scaled down according to the similarity criteria of dimensionless Fr and Re. The velocity distribution was measured with LDA for water flow in two configurations: one with a dam and a weir, another free of internals. The momentum source for the fluid flow in continuous casting tundish is observed to be the downward jetting stream as revealed by a highspeed camera. The stream entrains the surrounding liquid and forms a liquid jet expanding at an angle of 10 to 12°. The jet strikes the bottom of the tundish and then deflected while spreading. The dam reduces flow along the bottom and alters the flow pattern When the liquid level is lower than a critical height, a vortex is formed when draining the tundish. Flow rate and the stopper can affect the formation of a vortex. The critical height during fluid level rising is larger than that when the level is dropping.
出处
《化工冶金》
CSCD
北大核心
1990年第4期364-368,共5页
基金
国家自然科学基金
