A. Soda, R. Voss

This paper presents results of a numerical investigation dealing with steady and unsteady aerodynamic wing-nacelle-pylon (WNP) interference effects. In the first part of the paper the design process of the generic WIONA (Wing with Oscillating Nacelle) geometry is described. It is shown that development of major interference effects in the channel between wing and nacelle strongly depends on geometrical parameters of the configuration. After the geometry definition, the steady viscous interference effects are investigated and the influence of different flow parameters is analysed. It is shown that viscous interference features are dominated by the interaction between shock wave and boundary layer. In the last part of the paper an analysis is given of the unsteady aerodynamics features characteristic for a WNP cluster. The unsteady aerodynamic response to the pitching oscillations is investigated and it is shown that local flow separation and re-attachment play a crucial role in the possible aerodynamic excitation of the structure. Additionally, the issue of self-sustained shock oscillation occurring in the WNP region in the case of stationary geometry (shock-buffet) is investigated.

International Forum on Aeroelasticity and Structural Dynamics, 2005, München

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 2005, 2005-04, International Forum on Aeroelasticity and Structural Dynamics 2005; S.1-12; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

transonic flows, aerodynamics

Bibliothek

2005