Triebstein, H. and Schewe, G. and Zingel, H. and Vogel, S. (1) (1990) Measurement of Unsteady Pressures and Forces on an Engine and a Wing/Engine Combination Including Jet Simulation. ICAS '90, 9-14 September 1990, Stockholm, Sweden 17th Congress International Council of the Aeronautical Sciences.
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Experimental investigations on the unsteady aerodynamic forces were performed on an ejector engine model and a wing/engine combination in the subsonic and transonic flow regimes. The experimental results were compared to theoretical results. The aim was to determine how well the commonly used mathematical aerodynamic models for flutter calculations correspond to the actual relationships observed on engines. The investigations on the ejector engine demonstrated that linear lifting surface theory provides accurate unsteady aerodynamic forces. The effects of Mach number and reduced frequency are described correctly. For the wing/engine combination, the unsteady interference effect for engine oscillation on the lower side of the wing is strongly influenced by flow separation at the wing/pylon connection. In general, the unsteady aerodynamic forces on the wing are small and, at this order of magnitude, can be correctly calculated with the linear lifting surface theory.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=1990, pages=11,|
|Title:||Measurement of Unsteady Pressures and Forces on an Engine and a Wing/Engine Combination Including Jet Simulation.|
|Page Range:||pp. 51-61|
|Series Name:||ICAS 90-3.1.1, Vol.1|
|Keywords:||Unsteady Forces, Subsonic Flow, Transonic Flow, Jet Simulation|
|Event Title:||ICAS '90, 9-14 September 1990, Stockholm, Sweden 17th Congress International Council of the Aeronautical Sciences|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||other|
|HGF - Program Themes:||other|
|DLR - Research area:||UNSPECIFIED|
|DLR - Program:||no assignment|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Aeroelasticity|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||02 Apr 2006|
|Last Modified:||27 Apr 2009 10:42|
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