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M.M.L. Diouf, T. Lengyel-Kampmann, R. Schnell
Nowadays, global warming is one of the biggest issues for human being. A huge part of this warming is due to pollution from the transport industry and more particularly the aeronautical field. A lot of efforts are made in the turbofan engines design with the aim of improving the overall performance as well as respecting the environment (ACARE restrictions). To reduce fuel consumption, new aircraft concepts such as boundary layer ingesting (BLI) configurations are emerging . BLI is a concept in which the engine ingests and reaccelerates the boundary layer from the aircraft fuselage in order to increase propulsive efficiency. It becomes then necessary to investigate the fan/BLI interactions and understand their detrimental influences on the fan performance. In this context, measurements are planned for 2019 at the Institute of Propulsion Technology of DLR in Cologne in which a generic and several real fuselage boundary layers are generated within a duct upstream of a contra rotating fan . The aim of the present study is to provide results about the aerodynamic effects induced by BLI/fan interaction at given measurement locations . This will be done by means of uRANS and Harmonic Balance based CFD computations involving different numerical setups and boundary conditions in order to quantify and isolate the different influential parameters. This is to understand the flow physics on the one hand as well as in order to prepare the cost intensive measurement campaign. In order to assess the dominant effects and most important influential parameters on the fan aerodynamic performance, relevant metrics such as the fan total pressure ratio, isentropic efficiency and the mass flow rate will be considered. In order to better understand the physical detailed interaction mechanisms, the results will also be analyzed based on local flow features as being observed in the CFD results.
Deutscher Luft- und Raumfahrtkongress 2018, Friedrichshafen
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2018
21,0 x 29,7 cm, 9 Seiten
Stichworte zum Inhalt:
BLI, boundary layer ingestion, counter-rotating fan
Diouf, M.M.L.; Lengyel-Kampmann, T.; Schnell, R. (2018): Interaction of an Aircraft Fuselage Boundary Layer with a Contra-Rotating Turbofan. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Obert e.V.. (Text). https://doi.org/10.25967/480125. urn:nbn:de:101:1-2018100815295090740945.