Full Content is available to subscribers

Subscribe/Learn More  >

Experimental Operating Range Extension of a Twin-Spool Turbofan Engine by Active Stability Control Measures

[+] Author Affiliations
Stephan G. Scheidler, Leonhard Fottner

Universität der Bundeswehr München, Neubiberg, Germany

Paper No. GT2004-53077, pp. 35-44; 10 pages
  • ASME Turbo Expo 2004: Power for Land, Sea, and Air
  • Volume 2: Turbo Expo 2004
  • Vienna, Austria, June 14–17, 2004
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4167-7 | eISBN: 0-7918-3739-4
  • Copyright © 2004 by ASME


Modern engine operation is guided by the aim to broaden the operating range and to increase the stage loading allowing the stage count to be reduced. This is possible by active stability control measures to extend the available stable operating range. Different strategies of an active control system like air injection and air recirculation have been applied. While in the past mainly results have been published regarding the stability enhancement of compressor rigs or single-spool engines, this experimental study focuses as well on the stability as also on the operating range extension of a twin-spool turbofan engine as an example for a real engine application on an aircraft. The objective of this investigation is the analysis of the engine behavior with active stabilization compared to not supported operation. For this purpose high frequency pressure signals are used and analyzed to investigate the effects of air injection with respect to the instability onset progress and the development of any instabilities like rotating stall and surge in the LP Compression system. These Kulite signals are fed to a control system. Its amplified output signals control fast acting Direct Drive Valves circumferentially distributed ahead of the LPC. For the application of air injection described in the paper, the air is delivered by an external source. The control system responsible for air injection is a real-time system which directly reacts on marked instabilities and their pre-cursors. It allows the LP Compression System to recover from fully developed rotating stall by asymmetric air injection based on the pressure signals. Additionally, a delayed appearance of instabilities can be provoked by the system. Air injection guided by this control system resulted in a reduction of the required amount of air compared to constant air injection. Also, disturbances travelling at rotor speed can be detected, damped and eliminated by this control system with a modulation of the injected air in such a way that the injection maximum travels around the 10 injection positions.

Copyright © 2004 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