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 % Number of blades, z: 2 Wing profile: NACA 23015 Angle of attack, a: 8 o

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Design parameters
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: 8o

  • Lift coefficient, CL: 0,8

  • Drag coefficient, CD: 0,01


Radius of the turbine
Radius of the turbine

D

Where:

A = Area [m2]

c = Wind velocity [m/s]

h = Efficiency [ - ]

P = Power [W]

r = Density [kg/m3]

R = Radius [m]


Speed of the turbine
Speed of the turbine

w

Where:

c = Wind velocity [m/s]

n = Speed [rpm]

w = Angular velocity [rad/s]

R = Radius [m]


Power through a section of the turbine blade

dA

dr

r

Power through a section of the turbine blade


Torque force d f t from a section of the turbine blade
Torque force, dFT from a section of the turbine blade

dFT

dA

dr

r


Wing profile
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


Chord length l chord

u

F

v

c

Chord Length, Lchord

Lchord



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