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Aero EnginesModulated air system

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ECOFlex-turbo 3.4.4

Modulated air system

The project's objective is the generation of specific concepts of flexible secondary air systems (SAS). The initial point is an existing methodology for the design and evaluation of secondary air flows, which can be modulated at off-design. This method will be extended with several models to consider effects of SAS modulation, which are not implemented yet, e. g. a flexible loss prediction resulting from disc pumping or a meanline calculation for correction of interfaces between SAS and main gas path. Additional models to be implemented are evaluations of SAS customers critical requirements as well as a weight estimation of additional elements necessary to modulate secondary air flows.

The methodology is used to perform studies on flexible SAS sensitivies to get a better understanding of the resulting changes in boundaries and parameters of the compressor, turbine, SAS customers and engine performance. On this basis recommandations for the design of flexible SAS are defined. Finally, an flexible SAS concept for the reference engine will be optimized, which should serve as a virtual demonstrator of the technical potential of adaptive air flows.

This project is based on the findings in AG Turbo 2020 3.1.4.

Excerpt of applied software:

  • IPSM (simulation environment, based on NetBeans IDE)
  • GTlab (synthesis model)
  • Flowmaster (SAS model)

The investigations are conducted as part of the joint research programme ECOFlex-turbo in the frame of AG Turbo. The work was supported by the Bundesministerium für Wirtschaft und Engergie (BMWi) as per resolution of the German Federal Parliament under grant number 03ET7091I. The authors gratefully acknowledge AG Turbo and Rolls-Royce Deutschland for their support. The responsibility for the content lies solely with its authors.

Person of contact: Dipl.-Ing. Dominik Woelki

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