An experimental investigation was conducted in the 14- by 22-Foot Subsonic Tunnel at NASA Langley Research Center to measure the inflow into a scale model helicopter rotor in forward flight. The measurements were made with a two component Laser Velocimeter (LV) one chord above the plane formed by the path of the rotor tips (tip pathplane). A conditional sampling technique was employed to determine the position of the rotor at the time that each velocity measurement was made so that the azimuthal fluctuations in velocity could be determined. The results of these test were compared with inflow velocities predicted by a current technology rotor wake analysis program.
Inflow velocity measurements made on a helicopter rotor using a two-component laser velocimeter
Einstroemungsgeschwindigkeitsmessungen an einem Helikopterrotor mit Hilfe eines Zweikomponenten-Laservelocimeters
AIAA-Papers ; Jun ; 1-8
1987
8 Seiten, 15 Bilder, 11 Quellen
Conference paper
English