Three-dimensional fiber-optic LDV measurements in the endwall region of a linear cascade of controlled-diffusion stator blades
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Authors
Dober, David Michael
Subjects
Laser Doppler Velocimetry
Fiber-Optic LDV
Cascade Wind Tunnel
Controlled-Diffusion Blades
Endwall Region
Vortices
Secondary Flow
Fiber-Optic LDV
Cascade Wind Tunnel
Controlled-Diffusion Blades
Endwall Region
Vortices
Secondary Flow
Advisors
Hobson, Garth V.
Date of Issue
1993-03
Date
Publisher
Monterey, California: Naval Postgraduate School
Language
en_US
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-dif fusion compressor stator blades. Measurements
were taken at Reynolds numbers based on stator blade chord of
240000 and 711000. Total pressure measurements were first
conducted upstream and downstream of the controlled-dif fusion
stator blades. The approaching boundary layer was
characterized and the downstream vortex locations were
approximated. Upstream and downstream three-dimensional
fiber-optic LDV surveys viere 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 overall 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.
Type
Thesis
Description
Series/Report No
Department
Aeronautical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
115 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.