DIFFUSER DEVELOPMENT FOR A DIFFUSER AUGMENTED WIND TURBINE USING COMPUTATIONAL FLUID DYNAMICS D.G....
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Transcript of DIFFUSER DEVELOPMENT FOR A DIFFUSER AUGMENTED WIND TURBINE USING COMPUTATIONAL FLUID DYNAMICS D.G....
DIFFUSER DEVELOPMENT FOR A DIFFUSER AUGMENTED WIND
TURBINE USING COMPUTATIONAL FLUID DYNAMICS
D.G. PHILLIPS, P.J. RICHARDS and R.G.J.FLAY
The University of Auckland, New Zealand
The Vortec 7 Diffuser
Augmented Wind Turbine
Originally designed by Grumman Aerospace in the early 80’s, but built
in New Zealand in 1997.
New Zealand is a
long way from
anywhere!
There is very little
of anything to slow the
wind.
Diffuser Augmented Wind Turbines (DAWT)
Conventional Bare Wind Turbine
L
Secondary Slot
Turbine Blade
Inlet Truss
Structural Inlet Ring
Diffuser Outlet Flange
Inlet Slot Original Vortec 7
Instep
C
Geometry of the Vortec 7
L
Secondary Slot
Turbine Blade
Inlet Truss
Structural Inlet Ring
Diffuser Outlet Flange
Inlet Slot Original Vortec 7
Instep
C
Geometry of the Vortec 7
L
Secondary Slot
Turbine Blade
Inlet Truss
Bullnose
Structural Inlet Ring
Diffuser Outlet Flange
Inlet Slot Original Vortec 7
Modifications
Instep
NoseconeC
Geometry of the Vortec 7
Modelling the as-built Vortec 7
Modelling the modified Vortec 7
Vector Map for the modified Vortec 7
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Disc Loading
Av
aila
ble
Air
Po
wer
Co
effi
cien
t
Original Vortec 7
Modified Diffusers
Nosecone and ModifiedDiffusersSmooth Nacelle and ModifiedDiffusers
Wind Tunnel Modelling
CFD modelling of the new diffuser
0
0.5
1
1.5
2
2.5
0 0.5 1 1.5
Disc Loading
Av
aila
ble
Air
Po
we
r C
oe
ffic
ien
t Development DAWT
Vortec7 with Nosecone andModified Diffusers
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Disc Loading
Co
eff
icie
nts
Available Power Available PowerSpeed Up Speed UpBase Pressure Base Pressure
Wind Tunnel CFD Predictions
Original comparison
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Disc Loading
Co
effi
cien
ts
Available Power Available PowerSpeed Up Speed UpBase Pressure Base Pressure
Wind Tunnel CFD Predictions
Comparison including blockage effects.
Latest Design
CONCLUSIONS•Computational modelling has proved to be a valuable tool in the development of diffuser designs for a diffuser augmented wind turbine.
•The combination of computational modelling, wind tunnel modelling and full-scale testing has made it possible to identify deficiencies in the other techniques.
3rd International Symposium onComputational Wind Engineering
University of Birmingham, England
4-7 September 2000
COMPETITIONTo model the flow around a
6m Cube in a rural atmospheric boundary layer
www.pfconsultants.co.uk/cwe2000