Accession Number : ADA117425

Title :   Holographic Interferometry Technique for Rotary Wing Aerodynamics and Noise.

Descriptive Note : Conference paper,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Kittleson,John K ; Yu,Yung H

PDF Url : ADA117425

Report Date : 18 Jun 1982

Pagination or Media Count : 14

Abstract : In this paper, 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.

Descriptors :   *Vortices, *Rotor blades(Rotary wings), *Aircraft noise, *Measuring instruments, Holography, Interferometry, Flow visualization, Transonic flow, Three dimensional flow, Shock waves, Acoustics, Velocity, Helicopters, Aerodynamics, Rotary wing aircraft

Subject Categories : Helicopters
      Test Facilities, Equipment and Methods
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE