本文选用多重参考系法对搅拌桨进行模拟.对桨叶倾斜角度为90°(轴流型)、60°、45°和30°时混合效果进行比较,得到45°折叶涡轮搅拌桨的单位体积混合能最低.考察不同监测点对混合效果的响应情况,发现液面监测点混合时间稍长,桨叶部分监测点混合时间最短,随着桨叶倾斜角度增大,不同监测点混合时间差别变大.
In the paper,multi-reference frame(MRF)is used to simulate impellers.The mixing effects of agitators with blades of lean angle of 90°(axial flow type),60°,45°and 30°are compared.The results show that the mixing energy per unit volume in the 45.pitched blade turbines impellers in the tank is lowest.The respondences of different observation points to mixing effects of these kinds of impellers are investigated.The results indicate that the mixing time of observation on the surface is longer than that of the observation near the impellers,and the difierence becomes more obvious with increasing lean angles of impellers.
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