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Performance Analysis in a Subsonic Radial Diffuser FREE

[+] Author Affiliations
E. Casartelli, A. P. Saxer, G. Gyarmathy

Swiss Federal Institute of Technology, Zurich, Switzerland

Paper No. 98-GT-153, pp. V001T01A045; 10 pages
doi:10.1115/98-GT-153
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 1: Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7862-0
  • Copyright © 1998 by ASME

abstract

Steady-state numerical investigations in a subsonic vaned radial diffuser are presented. The 3D flow field has been computed with a commercial Navier-Stokes code (TASCflow), using two different types of axially variable but circumferentially uniform inlet flow conditions, one based on realistic (measured) time-averaged impeller outflow, the other on an idealized distribution. Two different vane leading-edge shapes were investigated. The leading edge redesign is based on the 2D analysis and inverse-design software package MISES.

For a complete operating speed line a detailed analysis of the flow structure and loss distribution within the diffuser is presented and the results obtained for the different inlet flow conditions and geometries are critically compared. The performance of the diffuser and its subcomponents is evaluated in terms of dimensionless quantities such as blockage, total-pressure-loss and pressure-recovery coefficients. Based on the comparisons and the cross performance analysis of the various effects due to leading edge redesign and different inlet velocity profiles, several design guidelines are postulated.

Copyright © 1998 by ASME
Topics: Diffusers
This article is only available in the PDF format.

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