Accession Number : ADA189907

Title :   Unsteady Flow Field Measurements Using LDV (Laser Doppler Velocimetry).

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Hedrick, Steven D

PDF Url : ADA189907

Report Date : Dec 1987

Pagination or Media Count : 73

Abstract : The primary goal of this thesis was the development of an experimental technique, and supporting software, for the acquisition and analysis of unsteady velocity data generated by an oscillating airfoil. This research was in support of a major investigation of the compressibility effects on dynamic stall. The experimental procedure involved schlieren flow visualization for comparison of steady and unsteady flow fields, and for determination of parameters for further study. Laser Doppler velocimetry was employed for obtaining velocity data in the airfoil wake. For unsteady data, the airfoil was oscillated in pitch about its quarter chord. The data analysis produced wake profile plots representing the flow field distributed by the airfoil. Results were obtained for steady and unsteady conditions. Keywords: Laser doppler velocimetry, Schlieren flow visualization, Dynamic stall.

Descriptors :   *AIRFOILS, *FLOW VISUALIZATION, *LASER VELOCIMETERS, *STALLING, *UNSTEADY FLOW, COMPRESSIVE PROPERTIES, COMPUTER PROGRAMS, DATA PROCESSING, DETERMINATION, DOPPLER SYSTEMS, DYNAMICS, FLOW FIELDS, LABORATORY PROCEDURES, MEASUREMENT, OSCILLATION, SCHLIEREN PHOTOGRAPHY, VELOCITY, WAKE, THESES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE