水力旋流器内空气柱的形成规律初探

Study on the Principle of Air Core Forming in Hydrocyclone

探讨了不同排料方式下的水力旋流器空气柱形成的机理 ,定量分析了旋流器的结构参数对形成空气柱最小压降的影响 .实验结果表明 ,传统大气排放式旋流器空气柱内的空气基本是从大气中吸入的 .形成空气柱的最小压降 ,随着溢流口直径及锥角的增大而增大 ,随着进料口直径的增大而减小 .而水封式旋流器空气柱的形成是由于旋流中心压力低于大气压后 ,溶解在液流中的气体析出而造成的 .同样结构的旋流器 ,其形成空气柱的最小压降比大气排放式旋流器的要大 ,且随着溢流口直径的增大而增大 ,随着进料口直径及锥角的增大而减小 .

Study on the mechanism of air core forming of different discharge of hydrocyclone, and the influence of geometric parameter on the minimum pressure drop of forming air core has been discussed quantitatively. Results show that the air in air core of conventional open-to-air hydrocyclone come from atmosphere basically. With increase of overflow diameter and cone angle, the minimum pressure drop of hydrocyclone increases. As the pressure of swirling center of water-sealed hydrocyclone is lower than atmospheric pressure, the gas dissolved in liquid is separated out to form air core. As to the same geometric parameter hydrocyclone as open-to-air hydrocyclone, the minimum pressure drop of forming air core of water-sealed hydrocyclone is larger than open-to-air hydrocyclone. With the increase of overflow diameter, the minimum pressure drop of water-sealed hydrocyclone increases, while with the increase of inlet diameter and cone angle, the minimum pressure drop of hydrocyclone decreases.