Full Content is available to subscribers

Subscribe/Learn More  >

Design and Testing of Multistage Centrifugal Compressors With Small Diffusion Ratios

[+] Author Affiliations
C. Aalburg, A. Simpson, M. B. Schmitz

GE Global Research, Munich, Germany

V. Michelassi, S. Evangelisti, E. Belardini, V. Ballarini

GE Oil & Gas, Florence, Italy

Paper No. GT2008-51263, pp. 1667-1676; 10 pages
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 6: Turbomachinery, Parts A, B, and C
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4316-1 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME


Two stators of a multistage centrifugal compressor with progressively smaller outer radii have been designed, built and tested. The aim was to achieve a significant reduction in outer diameter of the compressor stage without compromising performance. The reduction of size was achieved by reducing the diffusion ratio (outer radius/inner radius) of the vaneless diffuser in two steps. In the first step the outer diameter of the entire stage was reduced by 8% compared to the baseline design. In the second stage the outer diameter was reduced by 14%. The outer radius of the smallest design was limited by the impeller exit diameter, which was kept constant, as was the axial length of the stage. The large radius baseline design has been tested on a rotating rig in a 1.5 stage setup. This setup aimed at simulating multistage behavior by applying a pseudo stage upstream of the main stage. The pseudo stage consisted of a set of non-rotating preswirl vanes, in order to mimic an upstream impeller, and was followed by a scaled version of the return channel of the main stage. The experimental database was then used to calibrate a 1D analysis code and 3D-CFD methods for the ensuing design and optimization part. By applying extensive Design-Of-Experiments (DOE), the endwalls as well as the vanes of the stator part were optimized for maximum efficiency and operation range. In order to preserve multistage performance, the optimization was constrained by keeping the circumferentially averaged spanwise flow profiles at the exit of the smaller radius stages within close limits to the original design. The reduced radius designs were then tested in the same 1.5 stage setup as the baseline design. The results indicate that the reduction in size was feasible without compromising efficiency and operation range of the stage.

Copyright © 2008 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In