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TECHNICAL PAPERS

A Comparison of Standard Coherence Models for Inflow Turbulence With Estimates from Field Measurements

[+] Author and Article Information
Korn Saranyasoontorn, Lance Manuel

Department of Civil Engineering, University of Texas at Austin, Austin, Texas 78712 USA

Paul S. Veers

Wind Energy Technology Department, Sandia National Laboratories, Albuquerque, New Mexico 87185 USA

J. Sol. Energy Eng 126(4), 1069-1082 (Nov 18, 2004) (14 pages) doi:10.1115/1.1797978 History: Received January 01, 2004; Revised June 01, 2004; Online November 18, 2004
Copyright © 2004 by ASME
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Figures

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Illustration of the corrected lateral separation D computed from the horizontal distance between two sensors and the angle between the mean wind direction and a normal to the plane of the mast array θ
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(a) Estimates of uu-coherence spectra for a lateral separation distance of 13.4 m using data from Bin B and different numbers of subsegments Nd, (b) estimate of the uu-coherence spectrum and 90% confidence intervals using Nd=8
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Estimated power spectra of the along-wind (u), across-wind (v), and vertical (w) turbulence components for Bin B and comparison with the Kaimal along-wind turbulence spectrum 16 assuming a surface roughness of 0.5 cm.
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Estimates of uu-coherence spectra for different vertical separations (top row); and for different lateral separations (bottom row) based on data from Bins A, B, and C
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Exponential fits based on the IEC exponential model in Eq. (6) for uu-coherence spectra with (a) vertical separations of 8.5 and 17.0 m and (b) lateral separations of 6.7 and 13.4 m using data from Bin B
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Exponential fits based on the IEC exponential model in Eq. (6) for uu-coherence spectra with lateral separations of 6.7, 13.4, and 33.2 m using data from Bin B. The decay parameters used in this plot (a=9.7 and b=0.13) were estimated by fitting the model to all the measured uu-coherence spectra for all lateral separations and from all bins.
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Comparison of estimated coherence spectra for each turbulence component with (a) lateral separations (two upper rows) and (b) vertical separations (two lower rows) based on data from Bins A, B, and C.
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Comparison of the estimated uu-coherence spectra for lateral separations (based on data sets from three bins) with the IEC modified exponential (a=8.8,b=0.12,Lc=56 m), the von Kármán (L=56 m), and the Mann (s=3.9,l=14 m) models
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Comparison of the estimated vv-coherence spectra for lateral separations (based on data sets from three bins) with the von Kármán (L=56 m) and the Mann (s=3.9,l=14 m) models
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Comparison of the estimated ww-coherence spectra for lateral separations (based on data sets from three bins) with the von Kármán (L=56 m) and the Mann (s=3.9,l=14 m) models
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Estimates of cross-coherence spectra at the center of the rotor circle for the turbulence components taken two at a time based on data from Bins A, B, and C, compared with the Mann uniform shear model. (The isotropic von Kármán model predicts zero cross-coherences at all frequencies.)
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Primary inflow instrumentation on the main meteorological towers upwind of the LIST turbine. Hub height is 23 m; anemometers on the center tower are spaced 8.5 m vertically apart; anemometers at hub height are spaced 7.7 m laterally apart.
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Schematic view of the LIST test site showing the LIST turbine (Turbine B) and five meteorological towers

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