Accession Number : ADA263513


Title :   Three-Dimensional Fiber-Optic LDV Measurements in the Endwall Region of a Linear Cascade of Controlled-Diffusion Stator Blades


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Dober, David M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263513.pdf


Report Date : 25 Mar 1993


Pagination or Media Count : 128


Abstract : Measurements were taken of the vortex system that results from the interaction between a stator blade tip and the approaching endwall boundary layer in a linear cascade of controlled-diffusion compressor stator blades. Measurements were taken at Reynolds numbers based on stator blade chord of 240000 and 71 1000. Total pressure measurements were first conducted upstream and downstream of the controlled-diffusion stator blades. The approaching boundary layer was characterized and the location of the downstream vortices were approximated. Upstream and downstream three-dimensional fiber-optic LDV surveys were then conducted to observe the velocity profiles of the approaching boundary layer and to map the location and velocity characteristics of the downstream vortex system. Results clearly show the effect that the over-all secondary flow in the blade passage has on the location of the two oppositely rotating vortices. The downstream flow characteristics were also shown to be periodic. Laser doppler velocimetry, LDV, Fiber-Optic LDV, Cascade wind tunnel, Controlled diffusion blades, Endwall region, Vortices, Secondary flow.


Descriptors :   *BOUNDARY LAYER , *COMPRESSOR STATORS , VELOCITY , FIBER OPTICS , MEASUREMENT , BLADES , REGIONS , PROFILES , PRESSURE , STATORS , BLADE TIPS , SECONDARY FLOW , DOWNSTREAM FLOW , WIND TUNNELS , NUMBERS , COMPRESSORS , DIFFUSION , MAPS , SURVEYS , THREE DIMENSIONAL , LASERS , VORTICES , INTERACTIONS , THESES


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE