D. Woelki

The secondary air system (SAS) is vital for the safe operation of aero engines and longevity of thermally loaded parts. The extraction of secondary air from the compressor, its transfer and provision as e.g. cooling and sealing air leads to manifold interactions on whole engine level. To enhance the evaluation of novel engine concepts with noticeable changes in secondary air requirements and supply concepts, it is obvious that the SAS must be integrated into the design process and in the mulfi-fidelity simulation processes. With the focus on inter-disciplinary studies, three key features of SAS simulation are discussed: The first is the need for methods to derive a first SAS geometry at early design phases, which allows the realistic prediction of the mass flow distribution within the SAS. This particularly enhances cycle and turbine design. Second, the derivation of local pressures and temperatures in the inner SAS serves for the provision of boundary conditions for high-fidelity simulations. The third is full off-design capability, which allows the application of an SAS model within the scope of all relevant steady-state operating points. For this purpose, a 1D network simulation tool for holistic SAS modeling is going to be developed to extend the simulation capabilities. After a brief review of existing approaches and software implementations for 1D SAS modeling, specific implementation requirements are discussed which can be categorized as follows. First of all, the 1D network simulation tool shall be generally applicable for studies with focus on preliminary engine design and providing boundary conditions for high-fidelity sub-models. It should also be applicable in processes like engine health monitoring. Further, all physics-based interfaces to adjacent components and simulation tools must be properly defined. The software implementation must provide flexibility of interfaces in order to allow multi-fidelity simulations. All of this results in special requirements for the software architecture which is presented and discussed. Finally, research questions for future enhancements of 1D SAS modeling are presented.

Deutscher Luft- und Raumfahrtkongress 2023, Stuttgart

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2024

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

urn:nbn:de:101:1-2024010511061134545290

10.25967/610187

secondary air system, engine predesign, multi-fidelity

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Woelki, D. (2024): 1D Secondary Air System Modeling for Application in Engine Predesign and Multi-Fidelity. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/610187. urn:nbn:de:101:1-2024010511061134545290.

05.01.2024