CAJ | 학술논문

钢包在非稳态浇注过程中易形成旋涡，导致钢渣及空气的大量卷入，严重危害了钢的质量。为了更好的研究旋涡，采用ANSYS CFX软件，分别采用k-ε和RNG k-ε2种湍流模型对钢包非稳态浇注过程中自由表面旋涡进行数值模拟，得到自由表面从表面旋转到旋涡贯通水口的演化过程，将两者的计算结果与相关文献以及Burgers涡模型进行相互对比，得到：两者计算的旋涡演化过程、旋涡产生临界高度无差别；两者的速度场与相关文献均一致，但RNG k-ε模型更真实的表现了旋涡的剪切流动；将两者的切向速度分布与Burgers涡对比，得到RNG k-ε湍流模型与理论模型更加吻合。综上：用RNG k-ε湍流模型计算自由表面旋涡更加正确合理。
강포재비은태요주과정중역형성선와，도치강사급공기적대량권입，엄중위해료강적질량。위료경호적연구선와，채용ANSYS CFX연건，분별채용k-ε화RNG k-ε2충단류모형대강포비은태요주과정중자유표면선와진행수치모의，득도자유표면종표면선전도선와관통수구적연화과정，장량자적계산결과여상관문헌이급Burgers와모형진행상호대비，득도：량자계산적선와연화과정、선와산생림계고도무차별；량자적속도장여상관문헌균일치，단RNG k-ε모형경진실적표현료선와적전절류동；장량자적절향속도분포여Burgers와대비，득도RNG k-ε단류모형여이론모형경가문합。종상：용RNG k-ε단류모형계산자유표면선와경가정학합리。
During the unsteady teeming, it is easy to form vortex in ladle which leads to a large amount of slag and air entrapment resulting in deteriorating the quality of steel. To research the formation of vortex, the numerical simulation of free surface vortex on teeming process in ladle using k-ε and RNG k-ε turbulent models are carried out with the commercial software of ANSYS CFX. The process of free surface vortex, which is from rotation of free surface to vortex through the nozzle, is numerically simulated. The calculation results of two kind of turbulent models show no difference between the two of the evolution process of vortex and critical heights. The two velocity profiles are consistent with the relevant literature, but RNG k-ε demonstrates the shear flow of vortex more authentically. By comparing the two tangential velocity distributions with Burgers vortex model, it is found that RNG k-εcalculation result is much better consistent with theoretical model than k-εmodel. As a consequence, RNG k-ε turbulent model is better in calculation of free surface vortex.