Contribution
Experimental Investigations on a large-scale Cockpit-Fuselage Model for Surface Pressure Fluctuations
* Presenting author
Abstract:
In the DLR project INTONATE, wind tunnel measurements were carried out on a 6.6 m long fuselage model of a short and medium-range aircraft with 1 m diameter in the DNW-NWB in Braunschweig.The front section of the model is a precisely manufactured cockpit and an adjoining fuselage area in which measurements were taken at flow velocities of 15 to 60 m/s and angles of attack from -1° to 6°. The rear part is a long tail cone designed to prevent flow separation.The main measurements carried out were the acquisition of surface pressure fluctuations under the turbulent boundary layer at selected positions on the cockpit and the fuselage accompanied by the determination of the boundary layer thickness at the respective positions. Unsteady surface pressures were acquired with sub-miniature pressure sensors, which were located at the window, the side and in the top center of the cockpit.The investigations aim at the evaluation the differences in the spectrum shapes and thus the turbulence content of the boundary layer resulting from the flow at the different positions. The results obtained will later be compared to predictions based on numerical flow simulations and serve the improvement of turbulent surface pressure modeling methods.