Schönweitz, Dirk and Trailovic, Aleksandar and Schnell, Rainer (2013) Vortical Inflow Distortion in a Jet Engine Intake During Take-Off. 62. Deutscher Luft- und Raumfahrtkongress 2013, 10.-12. Sep. 2013, Stuttgart, Deutschland.
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The effects of inlet distortions arising from the interaction between the ground boundary layer and the ﬂow into a jet engine intake during ground operation and take-off is examined using computational ﬂuid dynamics (CFD). Steady state numerical simulations using the German Aerospace Center (DLR) in-house CFD-solver TRACE are conducted in order to identify the dependency of the interactions on parameters like mass ﬂow through the engine and far-ﬁeld Mach number. Object of the study is the nacelle and inlet duct of an International Aero Engines (IAE) V2500, a typical jet engine for a single aisle aircraft. For an axial inﬂow into the simulation domain, the variation of inﬂow velocity and mass ﬂow through the engine exposes three different conﬁgurations of the inﬂow distortion: undistorted inﬂow (no vortical structures in the intake section of the engine), distorted inﬂow with one dominant vortex in the lower part of the engine intake and one form of distorted inﬂow with two counter-rotating vortices. The undistorted inﬂow is associated with a low mass ﬂow through the engine when not the entire boundary layer upstream of the engine is ingested into the intake. Higher mass ﬂows result in a vortex system with two counter-rotating vortices in the lower part of the engine intake. Simulations with cross-ﬂow show an interaction between the inlet distortion from the ground interaction and the effects of the cross-ﬂow inside the nacelle resulting in a complex 3D-ﬂow. This study is a preliminary study for further investigations that will combine a full annulus model of the engines fan stage and the booster stage IGVs with the existing model of the nacelle, the inlet duct and the far ﬁeld. The focus of these future investigations will be the analysis of the inﬂuence of inﬂow distortions on the aerodynamics of the fan. This interaction is of particular interest regarding the possible integration of jet engines into the airframe of future aircraft concepts like blended wing bodies or ﬂying wings.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Vortical Inflow Distortion in a Jet Engine Intake During Take-Off|
|Date:||10 September 2013|
|Keywords:||Inlet Distortion, Ground Vortex, Engine Integration|
|Event Title:||62. Deutscher Luft- und Raumfahrtkongress 2013|
|Event Location:||Stuttgart, Deutschland|
|Event Type:||national Conference|
|Event Dates:||10.-12. Sep. 2013|
|Organizer:||Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Propulsion Systems|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Fan and Compressor Technologies|
|Institutes and Institutions:||Institute of Propulsion Technology > Fan and Compressor|
|Deposited By:||Dirk Schönweitz|
|Deposited On:||25 Nov 2013 10:48|
|Last Modified:||25 Nov 2013 10:48|
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