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Aerodynamics and Loss Accounting of a Low Pressure Ratio Fan for an Over-Wing Mounted Engine

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Fundamentals of High Lift for Future Civil Aircraft

Part of the book series: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ((NNFM,volume 145))

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Abstract

In recent research, several Boundary Layer Ingesting propulsors concepts have been investigated with varying degrees of airframe integration. The contribution compares the well-known approach of a \(60^\circ \) circumferential inlet distortion with a configuration of a partly wing-embedded and a fully embedded engine integration. The second type is characterized by a local distortion while the whole flow field of the third shows flow variations. Conventional distortion metrics are getting close to their limits for an adequate assessment. The focus of this contribution lies in highlighting differences in loss generation through the fan stage and at dedicated stations. The stator blade row has a changing role in terms of entropy production, depending on the distortion type. Concepts for a stator refitting are presented and successfully applied. Almost one-third of efficiency drop is recovered for the final design change.

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Acknowledgements

The authors are grateful to the Whittle Laboratory of the University of Cambridge for providing the inlet flow field of the Cambridge-MIT ’Silent Aircraft Initiative’. The Boundary Layer Ingestion research team at the Whittle Laboratory, and in particular Cesare A. Hall, Alejandro Castillo Pardo, Phoenix Tse, and Dusan Perovic, are gratefully acknowledged for the profound discussions and suggestions. Many thanks are also due Liping Xu and Ivor Day for comments on BLI and fan design. Udo Stark from the Institute of Fluid Mechanics at TU Braunschweig is also thanked for relevant discussions and continuous support.

The authors gratefully acknowledge the funding as part of the Coordinated Research Centre 880 (Sonderforschungsbereich 880, SFB 880) provided by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG).

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Authors and Affiliations

  1. Institute of Jet Propulsion and Turbomachinery, TU Braunschweig, 38108, Braunschweig, Germany

    Daniel Giesecke & Jens Friedrichs

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  1. Daniel Giesecke
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Correspondence to Daniel Giesecke .

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  1. Institut für Strömungsmechanik, Technische Universität Braunschweig, Braunschweig, Niedersachsen, Germany

    Rolf Radespiel

  2. Institut für Strömungsmechanik, Technische Universität Braunschweig, Braunschweig, Niedersachsen, Germany

    Richard Semaan

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Giesecke, D., Friedrichs, J. (2021). Aerodynamics and Loss Accounting of a Low Pressure Ratio Fan for an Over-Wing Mounted Engine. In: Radespiel, R., Semaan, R. (eds) Fundamentals of High Lift for Future Civil Aircraft. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 145. Springer, Cham. https://doi.org/10.1007/978-3-030-52429-6_19

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  • DOI: https://doi.org/10.1007/978-3-030-52429-6_19

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  • Print ISBN: 978-3-030-52428-9

  • Online ISBN: 978-3-030-52429-6

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