CAJ | 학술논문

为了查清旋流器内流速分布特征及其影响机理,在不同的结构参数和操作参数条件下,对旋流器内流速进行基于CFD方法的数值模拟.结果表明,在旋流器的内旋流和外旋流中均存在非对称的等轴向速度面,而且旋流器锥角和底流口直径对零轴向速度面锥底点的轴向空间位置具有显著的影响.另外,在旋流器有效分离区域内的水平面上存在切向速度的等值线.入口压强对轴向速度分布特征和切向速度分布特征的影响不显著,但可使切向速度及梯度明显增大,致使高密度颗粒向边壁的运动速度加快,从而使旋流分选的作用加强.
위료사청선류기내류속분포특정급기영향궤리,재불동적결구삼수화조작삼수조건하,대선류기내류속진행기우CFD방법적수치모의.결과표명,재선류기적내선류화외선류중균존재비대칭적등축향속도면,이차선류기추각화저류구직경대령축향속도면추저점적축향공간위치구유현저적영향.령외,재선류기유효분리구역내적수평면상존재절향속도적등치선.입구압강대축향속도분포특정화절향속도분포특정적영향불현저,단가사절향속도급제도명현증대,치사고밀도과립향변벽적운동속도가쾌,종이사선류분선적작용가강.
A CFD based numerical simulation of flow velocity of hydrocyclone was conducted with different structural and operational parameters to investigate its distribution characteristics and influencing mechanism.The results show there exist several unsymmetrical envelopes of equal vertical velocities in both upward inner flows and downward outer flows in the hydrocyclone,and the cone angle and apex diameter have remarkable influence on the vertical location of the cone bottom of the envelope of zero vertical velocity.It is also found that the tangential velocity isolines exist in the horizontal planes located in the effective separation region of hydrocyclone.The increase of feed pressure has almost no effect on the distribution characteristics of both vertical velocity and tangential velocity in hydrocyclone,but the magnitude and gradient of tangential velocity are increased obviously to make the motion velocity of high density particles to the wall increased and to make the cyclonic separation effect improved.