caa a22 4500 477093663 CHVBK 20180405111521.0 cr unu---uuuuu 170330e19960701xx s 000 0 eng 10.1007/BF00191687 doi (NATIONALLICENCE)springer-10.1007/BF00191687 Visualization and measurement of helicopter rotor flow with swept back tip shapes at hover flight using the "flow visualization gun” time line technique [Elektronische Daten] [R. Müller, M. Mba, E. Aymard, D. Favier, E. Berton, C. Maresca] The Flow Visualization Gun (FVG), a novel time line visualization technique, has been used to investigate the flow field of a helicopter rotor with swept back tip shape in hover flight condition. After introducing the FVG-technique, the paper presents some visualization photographs of the rotor blade tip vortices and the rotor downwash. Using orthogonal sets of flow photographs and digital image analysis, the 3-dimensional time line displacement within the flow and the tip vortex structure are determined. The data of 16 time line experiments are interpolated in space and time to obtain velocity data on an evenly spaced 3-dimensional grid. Vorticity contour plots of the flow field show the complex arrangement of the tip vortices of the blade itself and of the preceding blade and some additional vorticity in the direct wake which may form a secondary vortex. Understanding and control of this vorticity distribution is important for the design of new efficient tip shapes. While the FVG technique has been used so far for qualitative investigation of complex flow patterns at local velocities of up to 20 m/s, a good comparison to laser velocimetry data validates the technique as an interesting tool for both qualitative and quantitative investigation. Springer-Verlag, 1996 Müller R. F.I.B.U.S. Research Institute, Paul-Klee-Weg 8, D-40489, Düsseldorf, Germany aut Mba M. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut Aymard E. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut Favier D. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut Berton E. aut Maresca C. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut Experiments in Fluids Springer-Verlag 21/3(1996-07-01), 161-169 0723-4864 21:3<161 1996 21 348 https://doi.org/10.1007/BF00191687 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00191687 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Müller R. F.I.B.U.S. Research Institute, Paul-Klee-Weg 8, D-40489, Düsseldorf, Germany aut NATIONALLICENCE 700 1- Mba M. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut NATIONALLICENCE 700 1- Aymard E. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut NATIONALLICENCE 700 1- Favier D. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut NATIONALLICENCE 700 1- Berton E. aut NATIONALLICENCE 700 1- Maresca C. CNRS, Université d'Aix-Marseille I & II, IRPHE-Laboratoire ASI, Parc Scientifique de Luminy, 163 Avenue de Luminy, Case 918, F-13288, Marseille Cedex 09, France aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/3(1996-07-01), 161-169 0723-4864 21:3<161 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer