使用计算流体力学（CFD）数值模拟的方法，以单相流模型为基础，对DTB结晶器内的搅拌桨构型进行了优选。首先以20℃的水为介质模拟了搅拌槽内特定转速下的功率准数并与实验值进行了对比，较好地符合实际情况；后考察了DTB结晶器内3种不同的桨型、同种桨不同安装高度、双层搅拌桨不同安装间距对结晶器内速度、剪切速率、功率消耗及介质质量流率的影响。结果发现，此结构下的DTB结晶器，四斜叶桨性能总体要优于三叶推进桨和六直叶涡轮桨；搅拌桨安装高度为H/4时的性能要优于安装高度为H/3及H/5；双层搅拌桨时，搅拌桨间距较小时性能相对较好，但是此DTB结晶器中双层搅拌桨较单层搅拌桨的优点并不显著。

Using computational fluid dynamics (CFD) numerical simulation method,based on single-phase flow model,the configuration of agitator blade for DTB crystallizer is optimized.Firstly,the power number at specific speed in the stirred tank is simulated with water as medium at 20℃,and is compared with the experimental value,which agrees well with the practical situation.The effects of three different blade types,different installation heights for the same blade type and different installation distances between dual blades at different levels in the DTB crystallizer on the velocity,shear rate,power consumption and mass flow rate of medium in the crystallizer are studied.Study results show that the performance of four-inclined-blades under this structure is better than that of three-propeller and six-straight blade turbine propeller.The performance of the blade with an installation height of 1/4 H is better than that with an installation height of 1/3 H and 1/5 H.The shorter the distance is,the better the performance is when dual blades are employed.However,dual blades have not significant advantage than single blade in this DTB crystallizer.

汤俊杰(1993-),女,硕士生。