Reconstruction of the blade tip vortex system of the BO105
Photographs of a) undisturbed reference image of natural background, b) measurement image of BO105 helicopter in front of the same background, and c) vertical displacement gradient field based on cross-correlation between a) and b) depicting the blade tip vortex system (dark lines) and engine exhaust (noisy area behind helicopter).
Reconstruction of the blade tip vortex system of the BO105 helicopter during ascending maneuvering flight.
Different perspectives a-c) of the BO105 and reconstructed main rotor vortex system, and d) radial section at marked position in c).
André Bauknecht (Institute of Aerodynamics and Flow Technology, German Aerospace Center, Göttingen, Germany)