The effects of freestream turbulence on airfoil boundary layer behavior at low Reynolds numbers.
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Authors
Kindelspire, David W.
Subjects
Reynolds numbers
boundary layer
turbulence
laminar flow
transition
boundary layer
turbulence
laminar flow
transition
Advisors
Howard, Richard M.
Date of Issue
1988-09
Date
September 1988
Publisher
Language
en_US
Abstract
An experimental study was conducted to determine the effects of
freestream turbulence on airfoil boundary layer behavior. Freestream
turbulence intensity levels up to approximately 4% and length scales up
to approximately two inches were generated using turbulence-generating
grids. Data were collected using a single-wire hot-wire probe in
conjunction with a three-dimensional traversing system. Increased levels
of freestream turbulence were found to cause correspondingly earlier
transition to a turbulent boundary layer. Boundary layer growth was
found to be unaffected by freestream turbulence levels up to 4% at
length scales an order of magnitude greater than the boundary layer
thickness. For length scales on the order of boundary layer thickness, a
12% increase in the turbulent boundary layer thickness was found with
an increase in turbulence intensity from 0.23% to 0.5%.
Type
Thesis
Description
Series/Report No
Department
Aeronautics and Astronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
110 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.