功率超声作用下钢包内流场特性的模拟

Simulation of the flow field characteristics in a ladle under power ultrasonic

以120 t钢包为研究对象,对功率超声作用下钢包内的流场进行数值模拟,研究了功率超声对流场特性的影响结果表明:功率超声能够显著增加钢包内钢液的速度,作用范围主要集中于探头周围区域与传统吹氩搅拌相比,功率超声作用可大幅度缩短均混时间同时,在功率超声一个周期τ(417×10^(-5) s)的不同阶段,功率超声强度和钢液流速均呈现周期性变化,τ阶段作用范围最大当超声波的功率为800 W时,平均速度与峰值速度最大值分别为249×10^(-5 )m/s和240×10^(-3) m/s,显著作用区域为钢液总体积的1/10,均混时间由底吹氩200 L/min流量条件(标准态)下的108 s降低至65 s当功率为800~2000 W时,超声波对流场的影响主要体现在流速及均混时间方面,随着超声波功率的增加,流场流速增加,均混时间缩短2000 W功率条件下的平均速度与峰值速度分别为277×10^(-5) m/s和160×10^(-3) m/s,均混时间为32 s。

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 characteristicsThe 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 probeCompared with traditional argon blowing,power ultrasonic can greatly reduce the mixing timeMeanwhile,the power ultrasonic intensity and the liquid steel velocity show periodic changes at different stages of a power ultrasound cycleτ(417×10^(-5 ) s),and the action range of theτstage reaches the maximumWhen the ultrasonic power is 800 W,the average velocity and peak velocity are 249×10^(-5 ) m/s and 240×10^(-3 ) m/s,respectively,and the significant effect area is 1/10 of the liquid steel total volumeAccordingly,the mixing time decreases from 108 s under the condition of 200 L/min(standard state)argon flow to 65 sWhen 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 timeWith the increase of ultrasonic power,the velocity of flow field increases and the mixing time decreasesThe average velocity and peak velocity are 277×10^(-5 ) m/s and 160×10^(-3 ) m/s under ultrasonic power of 2000 W,respectively,and the homogeneous mixing time is 32 s.