An Analysis of Flow in a Centrifugal Impeller by FEM with k-ε Model

• 来源期刊: 热科学学报（英文版）
• 学科: 工学
• 年，卷（期）: 2001,（1）
• 页码范围: 7-13
• 页数: 7页
• 分类号: TK1
• 语种: 英文

摘要

In this study, we attempt the analysis of the passage flow in the centrifugal impeller using FEM with/without the turbulence model, and compare this result with the experimental result. The turbulence model is the low Reynolds k- ε model proposed by Chien. We use the GSMAC method for the Reynolds averaged Navier-Stokes equations,the Euler explicit method for the transport equations of the turbulent kinetic energy and the dissipation rate. All equations are discretized by the Galerkin's method.At the midpassage of the centrifugal impeller, the passagewise velocity component tends to increase in the pressure-to-suction direction, and the other component toward the pressure surface tends to be large in the region of the middle blade-to-blade to the hub side. The tip leakages appear around the region of the middle blade-to-blade near the casing together with the secondary flow toward the suction surface. These phenomena correspond with the experimental result, qualitatively.