Stall Warning Indicator

16060/TUB: Stall Warning Indicator


Performance data of newly developed compressors are so far measured on a test bench and then transferred to a characteristic diagram. An essential component of such a characteristic field is the so-called surge limit, since this is essential for ensuring safe operation. Exceeding the surge limit will result in instabilities, causing extremely high aerodynamic loads to the compressor that may result in considerable structural damages. However, since the surge line on the test bench can only be identified if it has already been exceeded, so far costly complete failures of the tested compressors are accepted.

It is thus an object of the invention to provide a method for determining an indicator for a prediction of instabilities in a compressor, which reliably allows an early warning of the possible occurrence such instabilities, especially the achievement of the surge limit.


Technical Description

The method developed by scientists from the institute of Aerospace Engineering is an early warning system for compressor instabilities. According to this method the compressor on a test bench is gradually been moved to its surge limit. During this process high-resolution pressure measurement is performed and the collected data can be used to calculate a specific integral parameter.

If this parameter is afterwards subsequently plotted over all measured operating points, one can obtain a secure possibility of predicting the operating limit and thus the surge limit, enabling a due detection of burner instabilities

Functionality and potential of the novel method as stall warning algorithm where successfully investigated using a newly built miniature single-stage low speed axial compressor.


Anwendungsmöglichkeiten / Possible applications:

The method can be applied to thermal turbomachines such as axial or radial compressors, whereby axial compressors represent a central component in aircraft engines.

Interested? Contact Us! Interested? Contact Us!
Show all techoffers Vorteile / Benefits:
  • Determining the surge line without exceeding it
  • Disturbances can be clearly identified and quantified
  • Method indicates last stable operating point before stall
Entwicklungsstand / Development status:


Reifegrad / Maturity level:


Schlagworte / Tags:
algorithm, axial compressor stall, early warning system, method, rotating instabilities, stall inception, stall indicator
Schutzrechte / Property rights:

DE, PCT - pending

Patentinhaber / Patent holder:

Technische Universität Berlin

Möglichkeiten der Zusammenarbeit / Possible cooperation:
  • R&D Cooperation
  • Patent Sale
  • Licensing

Ansprechpartnerin / Contact Person:
Ina Krüger

Tel.: 030 314-75916
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