Simulation of the flow field characteristics in a ladle under power ultrasonic
Taking a 120 t ladle as the research object,the flow field in the steel ladle under the action of power ultrasound has been numerically simulated to study the influence of power ultrasound on the flow field characteristics.The results show that power ultrasonic can significantly increase the velocity of liquid steel in the ladle,the action range is mainly concentrated in the area around the probe.Compared with traditional argon blowing,power ultrasonic can greatly reduce the mixing time.Meanwhile,the power ultrasonic intensity and the liquid steel velocity show periodic changes at different stages of a power ultrasound cycle τ(4.17×10-5 s),and the action range of the τ stage reaches the maximum.When the ultrasonic power is 800 W,the average velocity and peak velocity are 2.49×10-5 m/s and 2.40×10-3 m/s,respectively,and the significant effect area is 1/10 of the liquid steel total volume.Accordingly,the mixing time decreases from 108 s under the condition of 200 L/min(standard state)argon flow to 65 s.When the ultrasonic power is 800～2000 W,the influence of power ultrasonic on the flow field is mainly reflected in the flow velocity and homogeneous mixing time.With the increase of ultrasonic power,the velocity of flow field increases and the mixing time decreases.The average velocity and peak velocity are 2.77×10-5 m/s and 1.60×10-3 m/s under ultrasonic power of 2000 W,respectively,and the homogeneous mixing time is 32 s.
万方数据
维普
