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TECHNICAL PAPERS

Studies on a Horizontal Axis Wind Turbine With Passive Pitch-Flap Mechanism (Performance and Flow Analysis Around Wind Turbine)

[+] Author and Article Information
Yukimaru Shimizu, Yasunari Kamada

Department of Mechanical Engineering, Mie University, 1515 Kamihama-cho, Tsu, Mie 514-8507, Japan

J. Fluids Eng 123(3), 516-522 (Mar 01, 2001) (7 pages) doi:10.1115/1.1375817 History: Received September 12, 2000; Revised March 01, 2001
Copyright © 2001 by ASME
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References

Figures

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(a) Axial and radial velocity distribution for passive rotor (n=504 rpm, CPmax) and fixed rotor (n=690 rpm) (Uncertainty in ū/U: less than ±0.5 percent); (b) axial and radial velocity distribution for passive rotor (n=690 rpm, CP=0) (Uncertainty in ū/U: less than ±0.5 percent)
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Relationships among radius r, axial velocity u, attack angle α, thrust dT and torque dQ (Uncertainty in u: less than ±0.06 m/s, in a: less than ±0.4 degree, in dT: less than ±1 N, in dQ: less than ±0.08 N⋅m)
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(a) Lift and drag acting on the element of rotating blade at normal state; (b) lift and drag acting on the element near the blade tip at braking state
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(a) Schematic outline of tufted grid method at X-Y plane; (b) tufted grid method; (c) smoke method
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Flow visualization for passive rotor (γ/ζ=3) at CPmax
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Flow visualization by tufted grid method on X-Y (axial) (a) Axial plane (X-Y),z=0; (b) rotor plane (Y-Z),x=0.1D
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Flow visualization by smoke method on Y-Z (rotor) plane, x=0.1D for passive rotor (γ/ζ=3) at CP=0,U=4 m/s
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Flow field around passive rotor at CP=0
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(a) Experimental apparatus; (b) dimensions of test blade
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Overview of pitch-flap mechanism
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Schematic diagram of two-dimensional Laser Doppler velocity meter
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Relation between axial velocity u and azimuth angle ψ for fixed rotor at x=0
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(a) Power coefficient CP and torque coefficient CQ as a function of tip speed ratio λ for fixed rotor and passive rotor (uncertainty in CP: less than ±0.4 percent, in CQ: less than ±0.3 percent, in λ: less than ±0.2 percent); (b) flap angle, ζ, pitch angle, γ, as a function of rotational speed of rotor n (Uncertainty in ζ: less than ±0.1 degree, in γ : less than ±0.3 degree)
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(a) Output power P as a function of rotational speed of rotor n (Uncertainty in P: less than ±3 W, in n: less than ±1 rpm); (b) flap angle, ζ, pitch angle, γ, as a function of rotational speed of rotor n (Uncertainty in ζ: less than ±0.1 degree, in γ: less than ±0.3 degree)

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