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The Wind Resource
(source: http://www.tozzinord.it (source: ►
TN535 TN535 Tozzi Nord HAWT HAWT VAWT VS
/, April 2016) /, April 4
( source: me/eventi popolo/tozzi http ► :// - culturali/mostra
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• • • • • • Difficult to Low Inexpensive Easy start No yaw system Solidity
Cp
≈ Drag - 1 (high 1 (high torque) up protect protect @ high wind
- type VAWT type VAWT
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The Wind Resource • • • • • • •
High High vibration loads (fatigue Easy High Better Difficult start No yaw system Straight/curved blade - blade blade shape (
wind protected stall by Cp
( wrt -
Savonius up
Lift
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type VAWT type VAWT )
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► ://www.ropatec.it
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( source - :
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Combined Combined lift http ://hivawt.en.ec21.com/1500W_VAWT_Wind_Sy stem ►
1500W Hi 1500W -- 4092839_4092840.html April April 2016 4092839_4092840.html - VAWT Technology Co., VAWT Technology 7 ( source
- drag drag VAWT : Ldt .
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The Wind Resource
Let’s a consider here source:
λ Manwell = Ω 푈 푅
, J. L.F., ,Rogers. " and G.J.Anthony McGowan, Aerodynamics Aerodynamics Explained: Theory, Design and Application, Second Edition (2009 Edition Application, andDesign Second Theory, Explained: H - Darrieus
tan wind turbine (i.e.turbinestraight windblades) 푈 푈 푟푒푙 훼 = 2 = 1 ( − 1 − 휆 푎
+ 푎
sin ) 8 ( cos
1 휙 − + 휙 Aerodynamics of turbines wind Aerodynamics 푎 휆
) sin of of VAWT 휙 2 + (
1 ). −
푎 ) POLI cos ." Wind EnergyWind ." - 휙 Wind ResearchWind Lab
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Aerodynamics Aerodynamics stall ►
TSR = 2 = TSR
tan 훼 = 1 9 ( − 1
− 푎 푎 sin ) cos 휙 of of VAWT + 휙 휆
►
TSR = 8 = TSR POLI - Wind ResearchWind Lab
The Wind Resource
Edition(2009). Second Theory,Explained:Windturbines."Energy wind"Aerodynamics of Application, Designand For forsee, instance,details Not covered here.
Multiple Single 푎 solved iteratively. torqueThen computefrom get: topower 1 −
푎 Stream TubeStream
Stream TubeStream Momentum Theory = 8 퐵푐 휋푅 Aerodynamics Aerodynamics
0 2 휋
푈 Momentum Theory 푈 푟푒푙 2 Manwell 퐶 퐶 푃 퐿 cos = 4 휆 휋푅 퐵푐 훼 , J.F.,, J.AnthonyL.G. McGowan, Rogers.and +
0 휙 2 휋 + 푈
퐶 푈 푟푒푙 퐷 10 sin 2
퐶 훼 퐿 + sin 휙 of of VAWT 훼 − 푑 휙 퐶
푑 cos and 훼
푑 tan 휙
훼 POLI = - 1 Wind ResearchWind Lab (
− 1 − 푎 푎 sin ) cos 휙 + 휙 휆