Ebook - Wind Power - Savonius Rotor Design Manual.pdf

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SAN D76-0131
Unlimited
Release
UC-60
l
Wind
Tunnel
Performance
Data
for
TWO-
and
Three-Bucket
Savonius
Rotors
Ben F. Blackwell, Robert
E. Sheldahl,
Louis V. Feltz
Prepared
by Sand,a
Laboratories,
Albuquerque,
New
Mexico
87115
arxi
Livermore,
California
94550
for
the
UnKed
States
Energy
Research
and
Development
Administration
under
Contract
AT(29–1)-789
Printed
July
1977
*
. .
. .
SF2900Q(8-81
)
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.
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*
.
by
Sandia
Laboratories,
operated
for
the
United
States
Issued
Energy
Research
&
Development
Administration
by
Sandia
Corporation.
NOTICE
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was
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as an
account
of work
sponsored
by
the
United
States
Government.
Neither
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United
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nor
the
United
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Energy
Research
&
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Adrninis.
tration,
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nor
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755141313.003.png
SAND76-0131
Unlimited
Distribution
Category
Release
UC-60
Printed
July
1977
WIND
TUNNEL
PERFORMANCE
DATA
FOR
TWO-
AND
THREE
-BUCKET
SAVONIUS
ROTORS
Ben
F.
Blackwell
Robert
E.
Sheldahl
Aerothermodynamics
Division,
1333
Louis
V.
Feltz
Mechanical
Design
Division,
1324
Sandia Laboratories
Albuquerque,
NM
87115
ABSTRACT
Fifteen
configurations
of
a Savonius
rotor
wind
turbine
were
tested
in
the
Vought
Corporation
Systems
Division
4.9-
x
6. l-m
Low
Speed
Wind
Tunnel
to
determine
aerodynamic
performance.
The
range
of
values
of
the
varied
parameters
was
Number
of
Buckets
2 and
3
Nominal
Freestream
Velocity
7 and
14 m/s
Reynolds
Number
per
Metre
4.32
x
105
and
8.67
x
105
land
l.5m
Rotor
Height
Rotor
Diameter
(nominal)
lm
Bucket
Overlap
O. O- O.lm
The
measured
test
variables
were
torque,
rotational
speed,
and
tunnel
conditions.
The
data
presented
are
in
the
form
of
power
and
torque
coefficients
as
a function
of
speed
ratio
(or
angular
position
for
static
starting
torques).
It is
concluded
that
increasing
Reynolds
number
and/or
aspect
ratio
improves
performance.
The
recom-
mended
configuration
consists
of
two
sets
of
two-bucket
rotors,
rotated
90°
apart,
with
each
rotor
having
a dimensionless
gap
width
of
O. l-O.
15.
3
_—.—.
.
755141313.004.png
=,*
ACKNOWLEDGMENTS
.
.-
D.
F.
McNeill
(Division
1324)
handled
the
hardware
design
and
procurement.
l
David
Powers
(Division
1334)
and
Donald
MacKenzie
( 1334)
were
instrumental
in
Melvin
R.
Baer
( 1333)
assisted
with
several
aspects
recording
and
reducing
data.
of
the
data
analysis.
Bob
White
and
the
Low
Speed
Wind
Tunnel
staff
of
the
Vought
Corporation
provided
exceptional
cooperation
in
conducting
these
tests.
#
.
“
755141313.005.png
.-
CONTENTS
Page
NOMENCLATURE
10
1.
INTRODUCTION
13
H.
TEST
MODELS
AND
INSTRUMENTATION
15
III.
TEST
FACILITY
22
nr.
TEST
PROCEDURE
23
v.
DATA
REDUCTION
26
VI.
TEST
RESULTS
29
VII.
SUMMARY
AND
CONCLUSIONS
33
APPENDIX
-
UNCERTAINTY
ANALYSIS
91
REFERENCES
100
.
5
_—. -—
755141313.001.png

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