静磁场作用下结晶器内金属射流行为的数值模拟

利用ANSYS CFX软件，数值模拟了在静磁场作用下连铸结晶器内的水口出流的金属射流行为，通过分析其形态变化，考察了不同参数下液面波动F数的变化规律以及金属射流的扩张对结晶器壁面的冲刷强度的影响规律.模拟结果表明:水口出流射流具有扩张特性，在静磁场作用下，随着磁感应强度的增大，F数增大，金属射流扩张程度增加，且对结晶器宽面冲刷强度增加；随着板坯厚度的增大，F数增大，金属射流扩张程度增加，且对结晶器宽面冲刷强度减小；随着射流角度的增加，F数减小，对结晶器宽面冲刷加剧；对于电磁制动板坯连铸，不能单纯以F数作为控制指标，应充分考虑射流扩张对结晶器壁面冲击的影响，不同板坯厚度和水口射流角度应有适宜的控制参数.

Numerical Simulation on Behavior of Metal Jet in the Mold with Static Magnetic Field

Using ANSYS CFX software and considering the effect of static magnetic field， the behavior of metal jet out from submerged nozzle in continuous casting mold is investigated. With various casting parameters， the variation law of level fluctuation index(F value)and the effect of jet characteristics on the impact strength of jet against the mold wall are all analyzed. The results show that the nozzle jet flow has an expansion feature. Under the static magnetic field， with the magnetic flux density increasing， the F value， metal jet size and impact strength against the mold wide face increase; with the slab thickness increasing， the F value and metal jet size increase， but the impact strength against the mold wide face decreases; with the jet angle increasing， the F value and impact strength against the mold wide face increase. In the continuous casting process with static magnetic field， the F value is not the only control index， and the influence of metal jet expansion on the impact strength against the mold wall should also be considered， i.e. different slab thicknesses and jet angles should have appropriate control variables.