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针对连铸生产过程中常出现水口不对中的问题,通过旋流水口来消除偏心水口带来的不利影响。建立了圆坯结晶器内三维流动、传热数学模型,结合水模型实验,计算分析了水口优化前后结晶器内的流场和温度场。结果表明:合适的水口切向倾角可以使钢液产生较强的旋流,降低偏心浇注条件下结晶器内的偏流指数。旋流流场还可以减小钢液的冲击深度,促进钢液过热耗散,使热中心上移,均匀初生坯壳厚度,提高铸坯品质。
Aiming at the problem that nozzle misalignment often occurs in the continuous casting production process, the adverse influence caused by the eccentric nozzle is eliminated by swirling the nozzle. The mathematical model of three-dimensional flow and heat transfer in a round billet mold was established. Combined with the water model experiment, the flow field and temperature field in the mold before and after the nozzle optimization were calculated and analyzed. The results show that the proper tangential inclination of the nozzle can make the liquid steel produce stronger swirling flow and reduce the drift index in the mold under eccentric pouring conditions. The swirling flow field can also reduce the impact depth of the liquid steel, promote overheating and dissipation of the liquid steel, make the heat center move upwards, and even thick the thickness of the primary shell to improve the quality of the billet.