Abstract:

The influence of electromagnetic parameters (the distance between upper and lower poles and the coil current intensity) on the flow field in the mold and the volatile behavior of steel/slag interface was studied by numerical simulation. The results show that the magnetic induction intensity in the covered area of the upper magnetic pole and the lower magnetic pole in the full?amplitude two?stage electromagnetic brake crystallizer affects each other. The increase of the current intensity in the coil of the upper (or lower) magnetic pole will lead to the increase of the magnetic induction intensity in the covered area of the corresponding lower magnetic pole (upper magnetic pole). The full amplitude two?stage electromagnetic brake can significantly restrain the flow velocity of molten steel and stabilize the fluctuation of meniscus in the mold. As the distance between upper and lower magnetic poles increases, the impact intensity of molten steel jet on the narrow surface of the mold increases, and the turbulent kinetic energy and velocity of molten steel at the steel/slag interface increase. With the increase of the current intensity of the upper magnetic pole coil, the impact intensity of liquid steel jet on the narrow surface of the mold is basically unchanged, and the flow velocity and turbulent kinetic energy of liquid steel at the steel/slag interface decrease. As the current intensity of the lower pole coil increases, the impact intensity of liquid steel jet on the narrow surface of the mold decreases slightly, and the flow velocity and turbulent kinetic energy at the steel/slag interface decrease.

Key words: Continuous casting, Mold, Flow field, Electromagnetic brake, Numerical simulation

摘要：

采用数值模拟方法研究了电磁参数（上、下磁极间距和线圈电流强度）对结晶器内流场和钢/渣界面波动行为的影响。结果表明，全幅两段式电磁制动结晶器内上部磁极和下部磁极覆盖区域磁感应强度会相互影响，上部（下部）磁极线圈电流强度的增加，会导致对应的下部磁极（上部磁极）覆盖区域内磁感应强度增加；施加全幅两段式电磁制动可以显著抑制结晶器内钢液流速和稳定弯月面波动；当上、下磁极间距增大时，钢液射流对结晶器窄面的冲击强度增大，钢/渣界面处湍动能和钢液流速增大；随着上部磁极线圈电流强度增大，钢液射流对结晶器窄面的冲击强度基本不变，钢/渣界面处钢液流速和湍动能减小；随着下部磁极线圈电流强度增大，钢液射流对结晶器窄面的冲击强度略微减小，钢/渣界面处流速和湍动能减小。

关键词: 连铸, 结晶器, 流场, 电磁制动, 数值模拟