种分槽搅拌桨搅拌性能的实验测试与模拟分析

Experimental test and simulation analysis of mixing performance of agitating paddles in seed precipitator

从实验测试和计算流体力学数值模拟两方面同时对搅拌桨搅拌槽内部流场进行对比分析,考察不同桨叶离底距离、桨叶直径以及桨叶层间距下的颗粒浓度分布规律以及搅拌桨功率消耗。结果表明,转速一定时,桨叶直径越大越有利于颗粒悬浮,搅拌功率越高。提出了相对最佳桨径与槽径比D/T,过高或过低的桨叶离底距离都不利于颗粒悬浮,提出了相对最佳离底距离与槽径比C/T,桨叶离底距离对功率影响较小;过大或过小的桨叶层间距都不利于槽内颗粒的均匀悬浮,提出了相对最佳桨叶层间距与桨径比H/D。

From the experimental test and CFD numerical simulation, the agitator flow fields in tank are compared and analyzed, and the suspension of Al （OH） 3 particles and power consumption under the different conditions of the paddles off - bottom clearance （ C）, blade diameter （D） and blade inter layer distance （H） are investigated. The results show that when the rotation speed is constant, the larger the D is, the more favorable the particle suspen sion and the higher power consumption are. The optimal value of D/T is suggested, T is the tank diameter. Too big or too small C is not conducive to the suspension of AI（OH） 3 particles, while C had little eft）or on the power consmnption. The optimal value of C/T is suggested. Too big or too small H is also not conducive to the suspension of Al（OH）3 particles. The optimal value of H/D is suggested.