功率超声作用下钢液中空化泡尺寸的演变特性  

Evolution characteristics of cavitation bubble size in liquid steel under power ultrasound

作　　者：王顺 陈敏 郭庆 程伟浩 Wang Shun;Chen Min;Guo Qing;Cheng Weihao(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《钢铁钒钛》2023年第5期122-129,共8页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(52174301,51974080)。

摘　　要：利用四阶龙格库塔法,通过Matlab软件求解功率超声作用周期T与空化泡半径R之间的函数关系,研究了声压幅值、频率、初始平衡半径和气体多变指数对钢液中空化泡尺寸的影响。结果表明,1~2P0范围内产生稳态空化,频率和初始平衡半径的增加均使空化泡的峰值半径增大,初始平衡半径由5μm增加至50μm时,空化泡的峰值半径分别增加了0.35μm和90.75μm;频率由20 kHz增加至80 kHz时,空化泡的峰值半径仅增加了0.84μm。3~100P0范围内产生瞬态空化,初始平衡半径由5μm增加至20μm时,空化泡的峰值半径由423.01μm增加至896.12μm,而初始平衡半径增加至50μm时,空化泡的峰值半径减小为544.16μm;频率为20 kHz时,空化泡经历2次膨胀与收缩过程后崩溃,空化泡的峰值半径为488.05μm。气体多变指数对稳态和瞬态空化条件下的空化效应影响较小,当气体多变指数由1增加至1.65时,空化泡峰值半径分别减小了1.6μm和0.35μm。The effects of sound pressure amplitude,frequency,initial equilibrium radius of the cavitation bubble and gas multiplicity index on the cavitation bubble size in the liquid steel were investigated by solving the function of the power ultrasonic action period T and the cavitation bubble radius R using the Fourth-Order Runge Kutta method by Matlab software.The results showed that steady-state cavitation occurred in the range of 1~2P0,and the peak radius of cavitation bubble increased with the increase in the frequency and initial equilibrium radius.The initial equilibrium radius increased from 5μm to 50μm,and the cavitation bubble peak radius was increased by 0.35μm and 90.75μm,respectively.The peak radius of the cavitation bubble was increased by only 0.84μm when the frequency increased from 20 kHz to 80 kHz.The transient cavitation occurred in the range of 3~100P0.The peak radius of the cavitation bubble increased from 423.01μm to 896.12μm when the initial equilibrium radius was increased from 5μm to 20μm,while the peak radius of the cavitation bubble decreased to 544.16μm when the initial equilibrium radius was increased to 50μm.The cavitation bubble underwent two expansion and contraction processes before collapsing with a peak cavitation bubble radius of 488.05μm at a frequency of 20 kHz.The gas multiplicity index had a little influence on the cavitation effect under the steady-state and transient cavitation conditions.The cavitation bubble peak radius was only decreased by 1.6μm and 0.35μm,respectively,when the gas multiplicity index increased from 1 to 1.65.

关 键 词：钢液 炉外精炼 功率超声 空化泡半径 四阶龙格库塔法 

分 类 号：TF769[冶金工程—钢铁冶金]