底流口直径和锥角对旋流器流场的影响

利用计算流体力学的原理与方法,在底流口直径和锥角的多个水平下对旋流器内部流场进行了数值模拟,以揭示两因素对旋流器流场的影响.结果表明:增大底流口直径,流场内的流速降低,轴向零速包络面向上收缩;增大锥角后,轴向零速包络面的大小相应改变;锥角越小,底流口直径对轴向零速包络面内速度场的影响越小,故对改善分选效果的作用也越不明显;增大底流口直径,旋流器内流场的压强降低,但底流口区域内的压强梯度增大,而锥角不同,其变化程度有所不同,这从某些程度上体现了两因素对旋流器流场的交互影响.

Influence of Apex Diameter and Cone Angle on the Flow Field Inside Hydrocyclone

A CFD-based numerical simulation of the flow field inside a hydrocyclone was carried out at different levels to reveal the influence of apex diameter and cone angle on the flow field.The results showed that the flow velocity of the field decreases, with increasing apex diameter,then the enveloping surface at zero axial velocity shrinks. When the cone angle increases the size of the enveloping surface changes, and the smaller the cone angle, the less the influnee of apex diameter on the velocity field within the enveloping surface and the more unobvious the effect of improving separation. With the apex diameter increased, the pressure of the flow field decreases but the pressure gradient within the apex region increases differently in accordance to the change in cone angle. The phenomenon reveals the interactive influence between the cone angle and apex diameter in the flow field inside a hydrocyclone to a certain extent.