Accession Number : AD0757167

Title :   Determination of the Aerodynamic Characteristics of Vortex Shedding from Lifting Airfoils for Application to the Analysis of Helicopter Noise.

Descriptive Note : Final rept. 18 Jun 69-31 Jan 73,

Corporate Author : ROCHESTER APPLIED SCIENCE ASSOCIATES INC N Y

Personal Author(s) : Sadler,S. Gene ; Johnson,H. Kevin ; Evans,Timothy D.

Report Date : FEB 1973

Pagination or Media Count : 75

Abstract : A study of vortex shedding from a lifting airfoil has been carried out. The objective of the study was to determine the important parameters affecting vortex shedding from airfoils for application to the study of vortex noise in helicopters. The study was conducted in the UARL acoustic research wind tunnel. Measurements of far-field noise and surface pressure fluctuations were obtained and analyzed for a NACA 0012 airfoil. (Author Modified Abstract)

Descriptors :   (*ROTOR BLADES(ROTARY WINGS), *AERODYNAMIC NOISE), BLADE AIRFOILS, AERODYNAMIC CHARACTERISTICS, AIRCRAFT NOISE, POWER SPECTRA, PROBABILITY DENSITY FUNCTIONS, ACOUSTICS

Subject Categories : Aircraft
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE