The concepts of holography and holographic interferometry, as applied to the visualization and measurement of the three dimensional flow field near a rotor tip, are previewed, and initial experimental results of investigations of local shock structures and tip vortices behind the blade are presented. An additional method to visualize the flow in a three dimensional manner is demonstrated, and finally, a method to quantitatively measure the three dimensional flow, which will provide the necessary information to help improve helicopter performance and reduce noise, is introduced.
Holographic interferometry technique for rotary wing aerodynamics and noise
Army Sci. Conf. ; 1982 ; West Point, NY, United States
1981-01-01
Conference paper
No indication
English