Design of a small horizontal axis wind turbine, HAWT - PowerPoint PPT Presentation

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Design of a small horizontal axis wind turbine, HAWT. Design parameters. Power Output, P:300 W Wind velocity, c:8 m/s Tip Speed Ratio, TSR:5 Assumed efficiency, h :30 % Number of blades, z:2 Wing profile:NACA 23015 Angle of attack, a: 8 o

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Design of a small horizontal axis wind turbine, HAWT

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Design of a small horizontal axis wind turbine, HAWT

Design parameters

• Power Output, P:300 W

• Wind velocity, c:8 m/s

• Tip Speed Ratio, TSR:5

• Assumed efficiency, h:30 %

• Wing profile:NACA 23015

• Angle of attack, a:8o

• Lift coefficient, CL:0,8

• Drag coefficient, CD:0,01

D

Where:

A=Area[m2]

c=Wind velocity[m/s]

h=Efficiency[ - ]

P=Power[W]

r=Density[kg/m3]

Speed of the turbine

w

Where:

c=Wind velocity[m/s]

n=Speed[rpm]

dA

dr

r

dFT

dA

dr

r

Wing profile

Chord Length, Lchord

FL

FD

a

v

LChord

4

Where:

A=Area[m2]

a=Angle of attack[degrees]

CD=Drag Coefficient[ - ]

CL=Lift Coefficient[ - ]

FD=Drag Force[N]

FL=Lift Force[N]

LChord=Chord Length[m]

r=Density[kg/m3]

V=Relative velocity[m/s]

Peripheral velocity

Wind velocity = c

Relative velocity = V

V

u

c

u

w

FL

FD

u = w·r

a

q

v

c

F

FL

FD

F

a

u = w·r

q

F

v

u

c

v

c

F

u

v

c

F

a

u = w·r

q

F

v

FL(Torque)

FL

c

FD

FD(Torque)

F

a

u = w·r

q

F

v

FT

FL

c

FD

FT

v

u

F

v

c

Lchord