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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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Presentation Transcript
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]

wing profile
Wing profile

Chord Length, Lchord

slide8

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]

slide9

Peripheral velocity

Wind velocity = c

Relative velocity = V

V

u

c

u

w

slide10

FL

FD

u = w·r

a

q

v

c

slide11

F

FL

FD

F

a

u = w·r

q

F

v

u

c

v

c

slide12

F

u

v

c

F

a

u = w·r

q

F

v

FL(Torque)

FL

c

FD

FD(Torque)

slide13

F

a

u = w·r

q

F

v

FT

FL

c

FD

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