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Numerical Investigations of Unsteady Aerodynamics and Aeroelastic Stability of Engine Nacelles.

Knipfer, A. (1997) Numerical Investigations of Unsteady Aerodynamics and Aeroelastic Stability of Engine Nacelles. In: International Forum on Aeroelasticity and Structural Dynamics, Volume II, Volume II, pp. 215-222. CEAS - International Forum on Aeroelasticity and Structural Dynamics, 17-20 June, 1997, Rome, Italy.

Full text not available from this repository.

Abstract

The nacelles of modern aeroengines are constantly increasing in size.Thus, engine airloads are becoming more powerful and their importancefor aeroelastic stability is becoming more significant. The principlegoal of this study is to answer the question of how unsteady airloadsvary while shifting to transonic Mach numbers. The investigations arecarried out by applying a Finite Volume Euler method to a harmonically oscillating annular wing. The results show that transonic effects in the case of an annular wing are essentially weaker than in the case of an airfoil. The order of magnitude of the variations is about 10%. Possible consequences for aeroelastic stability are investigated with the example of an elastically mounted annular wing in transonic flow. The shifts of the stability curves also remain within a range of 10%. In addition, an Actuator Disk method, which is freqeuntly utilized for the simulation of the fan jet, is expanded in such a way that unsteady flows can be treated. Some unsteady airloads are strongly dependent on the pressure jump across the fan.

Item URL in elib:https://elib.dlr.de/39827/
Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=CEAS - Confederation of European Aerospace Structural Dynamics, LIDO-Berichtsjahr=1997,
Title:Numerical Investigations of Unsteady Aerodynamics and Aeroelastic Stability of Engine Nacelles.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knipfer, A.UNSPECIFIEDUNSPECIFIED
Date:1997
Journal or Publication Title:International Forum on Aeroelasticity and Structural Dynamics, Volume II
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Volume II
Page Range:pp. 215-222
Status:Published
Keywords:engine nacelle, annular wing, unsteady flow, euler equations, transonic, aeroelastic stability, jet simulation
Event Title:CEAS - International Forum on Aeroelasticity and Structural Dynamics, 17-20 June, 1997, Rome, Italy
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:55

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