Laser velocimeter measurements of rotor blade loads and tip vortex rollupA method for obtaining and analyzing the instantaneous velocities of helicopter rotor flow fields through use of a laser velocimeter capable of simultaneously sensing two components of velocity is described. Rotor blade aerodynamic loads may be computed from the velocity distributions near the blades. The experiment was conducted with a 2.13 m (7 ft) diameter model helicopter rotor operating in a wind tunnel. Velocity distributions are presented which document the flow field near the advancing blade. Circulation is calculated from the velocity measurements, and the radial distribution of circulation is discussed. The influence of the tip vortex from the preceding blade is apparent in this distribution. Tip vortex rollup on the advancing blade was documented by making a series of measurements at various distances behind the blade. Effects of blade drag are evident in the velocities behind the blade trailing edge.
Document ID
19760031600
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Biggers, J. C. (NASA Ames Research Center Moffett Field, CA, United States)
Chu, S. (NASA Ames Research Center Moffett Field, CA, United States)
Orloff, K. L. (NASA Ames Research Center Moffett Field, Calif., United States)