数值模拟了板坯结晶器内钢液的综合冶金行为.结果表明:钢水的流动状态主要决定于浸入式水口钢水射流形态和强度.在已经给定浸入式水口工作端的条件下,由于水口吐出孔附近存在低压抽引回流区,所以钢水仅从吐出孔下部流出,降低了水口吐出孔的有效利用面积.大断面会使其弯月面的过热度降低;坯壳温度变化主要集中在窄面冲击区域,该区域坯壳温度随铸坯断面增加而降低.断面尺寸为1 400 mm×230 mm和1 600 mm×230 mm的铸坯,结晶器出口处窄面凝固坯壳厚度能达到11.5 mm;对于1 800 mm ×230 mm断面在结晶器出口处窄面凝固坯壳厚度能达到13.4 mm.铸坯宽面坯壳厚度受断面变化的影响很小.
Numerical simulation of comprehensive metallurgical behavior of liquid steel in slab mold is de-scribed. It was found that the flow of liquid steel was decided by the shape and intensity of the jet of SEN. Under the condition of working tip structure of SEN used, the low pressure back flow zone near the side port of SEN result in the liquid steel outflow from the bottom of the sides port and the effective area of sides port became lower. The big fracture surface made the temperature of meniscus get low. The tem-perature of shell got low with the fracture surface increase. When the size of fracture surface is 1 400 mm × 230 mm and 1 600 mm×230 mm, the thickness of narrow side solidification shell of mold outlet is 11.5 mm; the size of fracture surface is 1 800 mm × 230 mm, the thickness of narrow side solidification shell of mold outlet is 13.4 mm. The fracture surface has little effect on the thickness of shell of wide sides.
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