为研究结晶器内液面波动特性的规律,防止连铸坯卷渣,提高铸坯质量,利用紊流淹没射流理论建立了浇注过程中钢液流股撞击结晶器窄边速度和撞击点位置理论模型,推导出液面波动指数的解析公式;通过与试验结果对比,验证了该理论模型的预测结果;利用数值仿真模拟1000 mm×130 mm板坯连铸结晶器在不同液面波动指数下的液面波动情况.计算结果表明,该理论模型结论与试验结论偏差为-4%~2.5%,可较好地评价结晶器内液面波动的剧烈程度,该型号板坯连铸结晶器最佳拉速为1.4 m/min.
Level fluctuation in the mold has great influence on the quality of continuous casting slabs. In order to study the regularity of level fluctuation in the mold,prevent slag entrapment and enhance slab quality,based on the theory of turbulent submerged jet,a theoretical model was constructed to study the flow velocity and the position of impingement point when the flow jet impacted on the narrow face in the mold. An analytical formula was derived to describe the level fluctuation index whose calculated value was later compared with that of the experiment and the result verified the cor-rectness of the established theoretical model. Numerical simulation was applied to investigate the wave under various lev-el fluctuation indexes. It shows that the error between the theoretical value and experimental result ranged from-4%to 2.5%,which could be adopted to evaluate the intensity of level fluctuation in mold. According to the established theoreti-cal model,1.4 m/min was the best casting speed for mold with cross section of 1000 mm×130 mm. This research is of theoretical significance in the prediction of surface wave and can provide practical guidance in the slab continuous cast-ing process.
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