锥角对水力旋流器压力场和速度场的影响

Cone Angle Effect on Hydrocyclone Pressure and Velocity Fields

针对所建立的静态水力旋流器结构模型进行了简要的分析,采用CFD软件中基于各相异性的雷诺应力湍流模型,应用PC-SIMPLEC算法,对双锥水力旋流器内部流场进行了的三维数值模拟,得到了旋流器内部流场的压力分布特性和速度分布特性。结合流体力学及旋流器理论分析验证模拟结果的正确性。研究发现:在一定范围内,水力旋流器内部压力降随大锥角增加而降低,因此适度增加大锥角可以降低旋流器内部的压力损失和能耗;切向速度随着大、小锥角的增加而增加;而适当缩小小锥角,可使准强制涡半径rm减小,从而提高分离效率。

The established static hydrocyclone structure model was analyzed. By means of Reynolds stress turbulent model based on the anisotropy in CFD software, the PC-SIMPLEC algorithm was applied to simulate biconical hydrocyclone flow field three-dimensionally so as to obtain the hydrocyclone pressure and velocity distribution, then having the simulation results verified with fluid mechanics and hydrodynamic theory demonstrates that with the increase of large cone angle, the hydrocyclone internal differential pressure and the energy consumption can decrease within a certain range; and the tangential velocity increases with that of both large and small cone angle; correctly cutting down the small cone angle can reduce prospective forced vortex radius r and can improve separating efficiency.