基于非线性湍流模型的多翼离心风机内部流场三维数值模拟及性能预测  

Three Dimensional Numerical Simulation of Internal Flow Field in Multi-blade Centrifugal Fan ased on the Non-linear Turbulent Model

作　　者：李亮[1] 王瑞[1] 金晗辉[1] 

机构地区：[1]浙江大学流体工程研究所,浙江杭州310027

出　　处：《流体机械》2012年第10期41-45,共5页Fluid Machinery

摘　　要：采用三维时均Navier-Stokes方程,在显式代数雷诺应力湍流模型(EASM)的基础上,通过引入扩展内禀平均旋转张量,建立了多翼离心风机数值模拟方法。基于数值模拟结果的性能预测和实验结果吻合良好,证实了所采用的计算模型和数值方法的可行性。通过数值模拟,分析了叶轮流道内速度场和压力场的分布,数值模拟结果表明叶轮流道呈现非常复杂的三维特性,在叶轮前盘存在二次涡流,吸力面则存在流动分离,并发现低能量的流体聚集在前盘区域,并分析比较了不同流量下流道中分离流动的情况。Based on the three-dimensional RANS and explicit algebraic stress models（EASM）,a new method,which the extended intrinsic mean spin tensor is instead of the intrinsic mean spin tensor,is developed to simulate the turbulent flow in a multi-blade centrifugal fan.The comparison of performance based on the simulating results with the experiment shows the simulation method is reliable.The velocity and pressure distribution of internal flow shows that the flow in impeller is very complicated,some essential characteristics of internal flow,such as separated flow on the suck side and the second flow on the front plane,have been observed.Additionally,the lower energy fluid is accumulated on the front plate area.

关 键 词：CFD 多翼离心风机 非线性湍流模型 

分 类 号：TH43[机械工程—机械制造及自动化]