钢液湍流漩涡中夹杂物运动行为

Movement behavior of inclusions in steel turbulent swirl

为研究钢液中湍流漩涡对钢中夹杂物行为的影响,采用Matlab软件对不同尺寸夹杂物所受斯托克斯阻力、重力、向心力进行分析,并构建钢液湍流漩涡中夹杂物运动行为模型。计算结果表明:漩涡中尺寸0~23μm的夹杂物以0~1m/s的初始切向速度做向心运动,逐渐聚集至涡心,其跃迁轨迹呈螺旋锥形,跃迁角、跃迁起点和终点与粒径、涡速相关。粒径、涡速越大,跃迁角越大,跃迁终点离涡心越远;而大于此尺寸范围的夹杂物惯性作用较强,离心运动趋势较大,重力将超过斯托克斯阻力成为主要作用力。通过水模拟实验得出漩涡中夹杂物的运动轨迹为螺旋锥形,与理论模型结果一致。

In order to study the effect of turbulence vortex on inclusion behavior, stokes resistance, gravity and cen- tripetal force on different size inclusions was analyzed by Matlab. And the model of inclusion behavior in the tur- bulent swirl was built. The results showed that the inclusions less than 23 gm did centripetal motion at initial tan- gential velocity of less than 1 m/s. Motion trajectory was helical cone and gradually gathered to the maelstrom. Transition angle, transition start and end had relationship with the particle size and scroll speed. The larger the particle size and scroll speed were, the greater the angle was. The end of transition was farther away from the maelstrom. While the inclusions with size above 23μm had stronger inertia and trends of eccentric exercise. Gravi- ty will exceed stokes drag and become the main force. The motion trajectory of inclusions was screw cone resulted from the water simulation which were consistent with the results of theoretical model.