环形流道内周向流对摩擦因子的修正公式  

Revised Formula for Friction Factor Affected by Tangential Flow in an Annular Channel

作　　者：张磊华 姚振强[1,2] 沈洪[1,2] 成德[1] 薛亚波[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《上海交通大学学报》2017年第1期46-50,共5页Journal of Shanghai Jiaotong University

基　　金：国家重点基础研究发展规划(973)项目(2015CB057302)资助

摘　　要：针对屏蔽电动机定转子环形流道内转子转动对其摩擦因子的影响作定量分析.搭建缩尺实验台,实验分析了不同转子转速下定转子间的压力分布规律.实验结果表明:转速的升高会引起压降增大,间隙环流的摩擦因子需要在经验公式上进行修正,分析拟合数据得到了修正系数与切向、轴向雷诺数比值的映射关系,从而推导出了环形流道内考虑周向流动下摩擦因子的修正公式.为了验证该公式的准确性与普遍性,利用计算流体动力学(CFD)软件对缩尺实验台与主泵屏蔽电动机定转子间的流场分别进行仿真,对比数值仿真与该修正公式所求得的摩擦因子,结果表明偏差在合理范围内.This paper aimed to find out the law of friction factor relative to the parameter of rotor rotating in the annular channel between the rotor and the stator of the canned pump. The distributions of pressure drop at different rotor speeds were measured by a scale test rig. The experimental results indicated that with the rotational speed increasing, the pressure drop between the inlet and the outlet also increases, and the original empirical formula of friction factor in an annulus channel is no longer suitable and should be re- vised. The function relationship between the revision factor and ratio of tangential/axial Reynold numbers was obtained by using data analysis. Thus, the revised formula of friction factor affected by tangential flow was derived. In order to verify the accuracy and universality of this formula, the flow characteristics and pressure drop of the fluid in the scale test rig and in the canned pump were studied by using the compu- tational fluid dynamics （CFD） method. The results showed that the bias of the friction factor calculated by simulation and the revised formula is small enough to be considered in a reasonable range.

关 键 词：环形流道 摩擦因子 修正公式 周向流 屏蔽泵 计算流体动力学 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]