Accession Number : ADA187629

Title :   Investigation of Dynamic Stall Using LDV (Laser Doppler Velocimetry): Mean Flow Studies.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Ryles, Richard R

PDF Url : ADA187629

Report Date : Sep 1987

Pagination or Media Count : 80

Abstract : This thesis lays the foundation for the dynamic stall investigation being conducted at the Fluid Mechanics Laboratory at NASA-Ames Research Center. Using existing optical and electrical equipment, a new dedicated Micro-VAX computer and Labstar software, an Indraft transonic wind tunnel and able technicians to make the proper interface hardware, the project came together in a new test facility at the Fluid Mechanics Laboratory. The goal of the thesis was to obtain both qualitative and quantitative information about the wake profiles of an airfoil in steady state operations at varying angles of attack and tunnel conditions. To accomplish this task, schlieren photography was used to obtain a qualitative picture of the flow field. With this information, a two component Laser Doppler Velocimeter was set up to accurately measure the velocity profiles that correspond to the schlieren photographs. Once this preliminary work is completed, the same apparatus will be used to further investigate the unsteady dynamic stall phenomenon.

Descriptors :   *LASER VELOCIMETERS, *STALLING, AIRFOILS, COMPUTER PROGRAMS, DOPPLER SYSTEMS, ELECTRICAL EQUIPMENT, FLOW, FLOW FIELDS, INTERFACES, MEAN, OPTICAL EQUIPMENT, PROFILES, STEADY STATE, THESES, TRANSONIC WIND TUNNELS, VELOCITY, WAKE, SCHLIEREN PHOTOGRAPHY, PHOTOGRAPHIC ANALYSIS, AERODYNAMIC FORCES

Subject Categories : Fluid Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE