efficiency of a vawt with airfoil pitch control - comsol.de fileefficiency of a vawt with airfoil...
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![Page 1: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/1.jpg)
Efficiency of a VAWT with
Airfoil Pitch Control
Junkun Ma1, Cris Koutsougeras2, Hao Luo2
October 6, 2016
1Sam Houston State University
2Southeastern Louisiana University
![Page 2: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/2.jpg)
VAWT and HAWT
VAWT: Vertical Axis Wind Turbine
HAWT: Horizontal Axis Wind Turbine
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Advantages and Disadvantages
Advantages:
• Easier to install and maintain
• No need to point into the wind
• Low risk for human or birds
• Can be installed in urban area
Disadvantages:
• Stall start
• Low efficiency
• Dynamic stability: vibration and noise
• Pulsatory torque
![Page 4: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/4.jpg)
VAWT with Pitch and Camber
Controls
![Page 5: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/5.jpg)
Governing Equations
Low speed laminar flow: Navier – Stokes equations
High speed turbulent flow: k - e turbulent flow model
![Page 6: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/6.jpg)
Force and Torque
Force:
Torque:
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NACA 0012 Airfoil
![Page 8: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/8.jpg)
COMSOL CFD Model
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Velocity Field
![Page 10: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/10.jpg)
Pressure Field
![Page 11: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/11.jpg)
Torque at 300 Support Arm Angle
35000
37000
39000
41000
43000
45000
47000
49000
51000
0 20 40 60 80 100 120 140 160 180
To
rqu
e (
N)
Attack Angle (0)
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Effects of Wind Speed
72000
74000
76000
78000
80000
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84000
0 20 40 60 80 100 120 140 160 180
To
rqu
e (
N)
Attack Angle (0)
5m/s
10m/s
15m/s
20m/s
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Effects of Support Arm Angle
0.0
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Effects of Support Arm Angle
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Effects of Support Arm Angle
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Conclusions
• Torque with respect to the VAWT main rotor
shaft depends on wind angle of attack and
support arm angle
• Wind speed does affect the peak torque. But the
torque increase due to higher wind speed is
insignificant
• For the NACA 0012 airfoil, the torque always
peaks out at 90 degree angle of attack at any
given support arm angle
![Page 17: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/17.jpg)
Future Work
• 2D multi-blades model
• 3D model to explore airfoil edge effect
• 3D multi-blades model
• Non-symmetric airfoil other than NACA 0012
![Page 18: Efficiency of a VAWT with Airfoil Pitch Control - comsol.de fileEfficiency of a VAWT with Airfoil Pitch Control Junkun Ma1, Cris Koutsougeras 2, Hao Luo October 6, 2016 1Sam Houston](https://reader030.vdocuments.mx/reader030/viewer/2022040711/5e15076521920528872c8dcf/html5/thumbnails/18.jpg)
Questions?