针对d50 mm水力旋流器内流场，分别进行了基于CFD模拟的数值研究和基于PIV流场测试的试验研究。两种方法对空气柱的研究结果均表明，空气柱在0.7 s 左右大致成形，且二者所得空气柱具有相似的特征。流场速度特性研究结果显示，在流场矢量图中，涡流被两种研究方法几乎在同一位置捕捉到；CFD模拟和PIV测试所得轴向速度分布结果也高度一致。用 CFD 数值研究的方法考察不同参数对流场切向速度和轴向速度的影响结果表明，旋流器内切向速度分布符合组合涡特征；给矿流量增大会使流速增大；增大锥角或者溢流口直径，会加快溢流的排出速度；而沉砂口的变化对流速的影响则很小。%For the flow field in a d50 mm hydrocyclone, numerical studies based on computational fluid dynamics (CFD) simulation and experimental studies based on particle image velocimetry (PIV) measurement were carried out respectively. The results of two methods show that air core generally forms after 0.7 s, the similar characteristics of air core can be observed. Vortexes and axial velocity distributions obtained by numerical and experimental methods are also in good agreement. Studies of different parameters based on CFD simulation show that tangential velocity distribution inside the hydrocyclone can be regarded as a combined vortex. Axial and tangential velocities increase as the feed rate increases. The enlargement of cone angle and overflow outlet diameter can speed up the overflow discharge rate. The change of underflow outlet diameter has no significant effect on axial and tangential velocities.
展开▼
