Lift and downwash interferences on the high aspect ratio ONERA calibration configuration have been isolated from other variables such as tunnel flow quality, 'effective' Reynolds number, and model distortion under load which are present in comparative wind tunnel data. The lift interference on the ONERA configuration was found to be related to the model to tunnel span ratio and is highly nonlinear in normal force at transonic speeds. Fighter and lifting body configurations were also studied. These lower aspect ratio configurations (AR under 4,) were found to be much less sensitive to wall interference. A family of curves which can be used to estimate lift and pitching-moment interference at transonic speeds is presented and an empirical dependency of lift interference on AR2 is suggested. (Buehn)
Experimental observations of wall interference at transonic speeds
Experimentelle Untersuchungen des Einflusses der Windkanalwand auf das Versuchsmodell bei transsonischen Geschwindigkeiten
AIAA-Papers ; 1-9
1978
9 Seiten, 16 Bilder, 6 Quellen
Conference paper
English