characterization of a new open jet wind tunnel to optimize ......characterization of a new open jet...
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Characterization of a New Open Jet Wind Tunnel to Optimize and Test Vertical AxisWind Turbines Using Flow Visualization and Measurement
Tourn, S. ; Gilabert, R. ; Sánchez, V. ; Pallares, J. ; Vernet, A. ; Cuesta, I. ; Schmidt Paulsen, Uwe
Publication date:2014
Document VersionPublisher's PDF, also known as Version of record
Link back to DTU Orbit
Citation (APA):Tourn, S., Gilabert, R., Sánchez, V., Pallares, J., Vernet, A., Cuesta, I., & Schmidt Paulsen, U. (2014).Characterization of a New Open Jet Wind Tunnel to Optimize and Test Vertical Axis Wind Turbines Using FlowVisualization and Measurement. Poster session presented at European Wind Energy Conference & Exhibition2014, Barcelona, Spain.
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Characterization of a New Open Jet Wind Tunnel to Optimize and Test
Vertical Axis Wind Turbines Using Flow Visualization and Measurement
S. Tourn, R. Gilabert, V. Sánchez, J. Pallares, A. Vernet, I. Cuesta* and U.S. Paulsen**
* Department of Mechanical Engineering. Universitat Rovira i Virgili
**Department of Wind Energy. Technical University of Denmark
PO. ID
233
EWEA 2014, Barcelona, Spain: Europe’s Premier Wind Energy Event
Characterize a new open jet wind tunnel and define the uniform test
section where performance studies of small VAWTs will be carried out.
Objectives Results
Conclusions
Methods
The flow characteristics were analysed by measurements with:
0.1
0.1
0.05
Working grid of
the test section.
A) Single hotwire probe
The measurements were taken in several planes
parallel to the nozzle exit and along the jet axis.
The mean velocity as well as the turbulence
intensity was estimated at every position of the
defined working grid (red points).
BACK VIEW SIDE VIEW FRONT VIEW
B) Cup anemometer
Exit Flow Uniformity and Turbulence Characteristics
x1= 1 m
x2= 2 m
y = 0
x= 1 m
y = 0
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
0,00 5,00 10,00 15,00z (
m)
mean speed (m/s)
5,50 m/s at x=1 m 11,20 m/s at x=1 m 15,10 m/s at x= 1 m
5,60 m/s at x= 2 m 11,40 m/s at x=2 m 15,40 m/s at x=2 m
z
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
0,00 5,00 10,00 15,00
z (m
) y (
m)
mean speed (m/s)
5,50 m/s along y 11,20 m/s along y 15,10 m/s along y
5,50 m/s along z 11,20 m/s along z 15,10 m/s along z
z y
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
0 4 8 12 16 20 24 28 32 36 40
z (m
) y (
m)
turbulence intensity (%)
5,50 m/s along y 11,20m/s along y 15,10 m/s along y
5,50 m/s along z 11,20 m/s along z 15,10 m/s along z
z y
-0,8
-0,6
-0,4
-0,2
0
0,2
0,4
0,6
0,8
-0,8
-0,6
-0,4
-0,2
0
0,2
0,4
0,6
0,8
0 4 8 12 16 20 24 28
z (m
) y (
m)
turbulence intensity (%)
5,60 m/s along y 11,40 m/s along y 15,40 m/s along y
5,60 m/s along z 11,40 m/s along z 15,40 m/s along z
Cup anemometer calibration
y = 0,6242x + 0,2968
4,00
6,00
8,00
10,00
12,00
14,00
16,00
18,00
5,0 10,0 15,0 20,0 25,0 30,0
Me
an
Sp
eed
(m
/s)
Cup Anem Output Signal (m/s)
CA PT Lineal (PT)
The final design of the open jet tunnel is original and allows for fair
performance at comparably low cost.
Present fair characteristics in the central section.
Can be operated at constants mean velocities and relatively low
turbulence intensities.
Results of a cup anemometer calibrated an accredited laboratory show
that the test section and conditions can provide new insight of cup
anemometers.
x1= 1 m
x2= 2 m
y = 0 x1= 1 m
x1= 1 m
x2= 2 m
z
y
z
y
x
Coordinate origin
The origin of the coordinate system is in the centre of the nozzle exit
500 500 500 500 1000
Nozzle
Pitot tube
Pitot tube
Uniform test section (800 x 800 mm2)
Measured positions
Pitot tubes positions
Cup anemometer calibrated
WindSensor
Type P 2546A
Risø DTU
The 3D graph presents mean velocity along positive z and y axis
Test section (1500 x 1500 mm2)
Mean speeds by cup anemometer (CA). Average speeds by pitot tubes (PT).
Linear fit obtained in 4-Winds OJWT y=0.6242*x(m/s)/(1/s)+0.297m/s.