Table of Contents
ISRN Mechanical Engineering
Volume 2013, Article ID 602384, 9 pages
Research Article

Numerical Modeling of the Flow in a Vaneless Diffuser of Centrifugal Compressor Stage

Technical Thermophysics Department, Sumy State University, 2 Rymskogo-Korsakova Street, Sumy 40007, Ukraine

Received 1 August 2013; Accepted 19 August 2013

Academic Editors: W.-H. Chen and G. Juncu

Copyright © 2013 Mykola Kalinkevych and Oleg Shcherbakov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the results of numerical investigation of the flow in a vaneless diffuser of centrifugal compressor stage. Simulations were performed using both a commercial CFD package ANSYS CFX and the own-designed computer program. Steady conditions involving SST turbulence model were used for the calculations using CFX. To consider the interaction between impeller and diffuser, not just a diffuser but the whole stage was calculated. The own-designed methodology is based on solving of conservation equations with assumptions that flow in a diffuser is steady state and axisymmetric. The flow area is divided into the flow core and boundary layers. Results of calculation were compared with experimental data.