Full Content is available to subscribers

Subscribe/Learn More  >

Bleed Airflow CFD Modeling in Aerodynamics Simulations of Jet Engine Compressors

[+] Author Affiliations
Franck Conan, Stephan Savarese

Snecma Moteurs, Moissy Cramayel, France

Paper No. 2001-GT-0544, pp. V001T03A085; 11 pages
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME


Several types of bleed airflow in jet engine compressors are required for both aircraft and engine operations. Since accessory, discharge or ventilation bleeds divert a significant percentage of the total input flow rate, it is compulsory to take these variations into account both in through-flow and in 3D Navier-Stokes compressor computations. While the former is straightforward to implement, which has been done for some time, several options are available for the three-dimensional case. The details of such models are most likely to have a local effect on the pressure and velocity fields distribution near the bleed section. Nevertheless, for the purpose of modeling the global effect of bleed flow magnitude on stage matching and overall aerodynamic stage performance, it is thought that a simple geometrical model of the bleed section combined with a simple outlet boundary condition will be accurate enough to provide a realistic representation of the actual compressor characteristics under various bleed flow rate conditions. Thus, our purpose in this study was to develop, implement and validate a simple model based upon both analytical geometry descriptions and outlet flow boundary conditions without any mesh modification or refinement with respect to the standard no-bleed calculations. The analytical description of bleed section is restricted to the intersection of the hub or casing with a set of radial cylinders or axisymetric slots, covering within manufacturing tolerance the known range of bleed section shapes. The physical boundary condition is applied at the intersection of the main flow path with the bleed duct or cavity outlet, ideally imposing a predefined exit flow rate. However, without access to an experimental database of engine bleed flow section measurements, only a qualitative comparison of the models with academic bleed flow experiments has been achieved. In order to assess the modeling scatter due to the details of the methods, two different models have been tested and validated against meridional flow computations, based upon compressor test results.

Copyright © 2001 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