轴流式离心分离器内部流场的数值模拟

Numerical Simulation of Internal Flow Field in Axial Flow Type Centrifugal Separator

轴流式离心分离器是核电设备中广泛应用的新式分离器,能够弥补切向入口式水力旋流器的不足。针对轴流式离心分离器,采用雷诺应力模型开展数值模拟研究,计算结果与实验所测得零速包络面长度误差小于5%。计算结果表明,分离腔室内切向速度的分布规律满足兰金涡的分布,同时上游端的一级引出口的布置能够提高内旋流区的切向速度,有利于分离。

Axial flow type centrifugal separator is a new separator widely used in nuclear power equipments,which can make up for the shortcomings of tangential inlet hydrocyclone.Aiming at the axial flow type centrifugal separator,the Reynolds stress model is used to carry out numerical simulation study.The error between calculation result and the zero-speed envelope surface length measured by the experiment is less than 5%.The calculation result shows that the distribution law of indoor tangential velocity in the separation chamber meets the distribution of Rankine vortex,and the arrangement of the first stage outlet at the upstream end can improve the tangential velocity in the inner swirl zone,which is conducive to separation.