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Modulated Air System
Zitatschlüssel 2020_woelki_finrep
Autor Woelki, D. and Peitsch, D.
Jahr 2020
DOI 10.2314/KXP:1757182853
Ort Berlin
Journal ECOFlex-Turbo 3.4.4 : Final Report
Notiz Also published in German as "ECOFlex-turbo 3.4.4 - Flexibles Luftsystem : Abschlussbericht" - "https://doi.org/10.2314/KXP:175718158X"

Technische Universität Berlin:
D. Woelki, D. Peitsch
Schule Technische Universität Berlin
Zusammenfassung The secondary air system (SAS) provides cooling and sealing air, which is vital for safe gas turbine operation. Although cooling air allows for higher turbine entry temperatures (TET) and thus higher thermal effciency, secondary air is the source of several losses. The design of the SAS is typically limited to a couple of critical operating points (OP). Especially in aero-engines, the major secondary air circuits are uncontrolled. In many OPs, this results in over-fulfilment of the secondary air requirements with corresponding potentially avoidable losses. This project continues previous work investigating the potential and challenges of variable cooling flows in off-design. This project is organized in two phases. The first deals with the extension of an already existing zooming model, which essentially combines a performance with an SAS model. As new modeling aspects, part lifetimes in the turbine as well as the integration of so-called fluidics and their mass estimation are presented. The second phase includes concept studies, which focus on a modulated secondary air supply in the pre-swirl system of the high pressure turbine. Key results are the trade-offs between fuel consumption and blade creep life. Within a business case assessment it can be shown that positive trade-offs exist between these target functions. This can be achieved by compensating the costs of reduced cooling air at e.g. cruise with an enhanced cooling supply at take off and climb. The business case assessment also includes intuitive recommendations for good secondary air turn down ratios between high and low power demands. Some quantitative examples for realistic benefits of the proposed technology are the following. A long range mission of 5000 NM could safe ≈ 0.09 % of the in flight mission fuel burn at maintained blade creep life. Short range missions of e.g. 500 NM show no manifest potential for savings in fuel burn. Nevertheless, a modulated secondary air supply may be used to enhance blade creep life at the cost of mission fuel burn. At the same time, mission ranges of ≥ 500 NM are even providing configurations with benefits in both target functions. Additionally, required masses of flow modulating devices, pipes etc. can be relatively simply implemented to the simulation, effectively representing offsets in the fuel burn over creep life diagrams. Overall, the presented methodology marks an achieved milestone for the capability of running sound concept studies on modulated SAS. The results give a firm insight to the main trade- offs and provide input for possible future studies on the economic benefit. Besides of that recommendations for necessary, subsequent works are formulated.
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