0
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
Your Session has timed out. Please sign back in to continue.

References

Nelson, L. D., Manuel, L., Sutherland, H. J., and Veers, P. S., 2003, “Statistical Analysis of Inflow and Structural Response Data from the LIST Program,” Proceedings of the ASME Wind Energy Symposium, paper No. AIAA-2003-0867, Reno, NV, pp. 276-282.
Veldkamp, D., 2003, “Influence of Wind Field Generation Methods on Wind Turbine Fatigue Loads,” European Wind Energy Conference and Exhibition, Madrid, Spain.
Mann,  J., 1994, “The Spatial Structure of Neutral Atmospheric Surface-Layer Turbulence,” J. Fluid Mech., 273, pp. 141–168.
Veers, P. S., 1988 “Three-dimensional Wind Simulation,” Report No. SAND 88-0512, Sandia National Laboratory, Albuquerque, NM.
IEC/TC88 61400-1, 1998, “Wind Turbine Generator Systems Part 1: Safety Requirements,” International Electrotechnical Commission (IEC), 2nd ed., Geneva, Switzerland.
Mann, J., Kristensen, L., and Courtney, M. S., 1991, “The Great Belt Coherence Experiment,” Report No. R-596, Risø National Laboratory, Roskilde, Denmark.
Schlez,  W., and Infield,  D., 1998, “Horizontal, Two Point Coherence for Separations Greater than the Measurement Height,” Boundary-Layer Meteorol., 87, pp. 459–480.
Larsen, G. C., and Hansen, K. S., 2003, “Spatial Coherence of the Longitudinal Turbulence Component,” European Wind Energy Conference and Exhibition, Madrid, Spain.
Sutherland, H. J., Jones, P. L., and Neal, B., 2001, “The Long-Term Inflow and Structural Test Program,” Proceedings of the ASME Wind Energy Symposium, paper No. AIAA-2001-0039, pp. 1-12, Reno, NV, pp. 162-172.
Jones, P. L., Sutherland, H. J., and Neal, B. A., 2001, “LIST/BMI Turbines Instrumentation and Infrastructure,” Report No. SAND2001-1642, Sandia National Laboratories, Albuquerque, NM.
Carter, G. C., 1972, “Estimation of the Magnitude-Squared Coherence Function,” Report No. 4343, Naval Undersea Systems Center, New London Laboratory, CT.
Kristensen, L., and Kirkegaard, P., 1986, “Sampling Problems with Spectral Coherence,” Report No. R-526, Risø National Laboratory, Roskilde, Denmark.
Jacobsen,  S., 1993, “Statistics of Leakage-Influenced Squared Coherence Estimated by Bartlett’s and Welch’s Procedures,” IEEE Trans. Signal Process., 41, No. 1, pp. 267–277.
Jenkins, G. M., and Watts, D. G., 1968, Spectral Analysis and its Applications, Holden-Day Inc., San Francisco, CA.
Schwartz, M., and Shaw, L., 1975, Signal Processing: Discrete Spectral Analysis, Detection, and Estimation, McGraw-Hill, New York.
Kaimal,  J. C., Wyngaard,  J. C., Izumi,  Y., and Cote,  R. O, 1972, “Spectral Characteristics of Surface Layer Turbulence,” Q. J. R. Meteorol. Soc., 98, pp. 563–598.
Davenport,  A. G., 1961, “The Spectrum of Horizontal Gustiness near the Ground in High Winds,” Q. J. R. Meteorol. Soc., 87, pp. 194–211.
Thresher, R. W., Holley, W. E., Smith, C. E., Jafarey, N., and Lin, S.-R., 1981, “Modeling the Response of Wind Turbines to Atmospheric Turbulence,” Report No. RL0/2227-81/2, Department of Mechanical Engineering, Oregon State University, OR.
Jensen, N. O., and Hjort-Hansen, E., 1977, “Dynamic Excitation of Structures by Wind–Turbulence and Response Measurements at the Sotra Bridge,” Report No. STF71 A78003, Trondheim-NTH, Norway.
Simiu, E., and Scanlan, R. H., 1996, Wind Effects on Structures: Fundamentals and Applications to Design, 3rd Ed., Wiley, New York.
Kristensen,  L., and Jensen,  N. O., 1979, “Lateral Coherence in Isotropic Turbulence and in the Natural Wind,” Boundary-Layer Meteorol., 17, pp. 353–373.
von Kármán,  T., 1948, “Progress in the Statistical Theory of Turbulence,” Proc. Natl. Acad. Sci. U.S.A., 34, pp. 530–539.
Mann,  J., 1998, “Wind Field Simulation,” Probab. Eng. Mech., 13, pp. 269–282.
Lee, M. J., and Hunt, J. C. R., 1989, “The Structure of Sheared Turbulence near a Plane Boundary,” 7th Symposium on Turbulent Shear Flows, Stanford University, CA.

Figures

Grahic Jump Location
Schematic view of the LIST test site showing the LIST turbine (Turbine B) and five meteorological towers
Grahic Jump Location
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.
Grahic Jump Location
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
Grahic Jump Location
(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
Grahic Jump Location
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.
Grahic Jump Location
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
Grahic Jump Location
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
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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
Grahic Jump Location
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
Grahic Jump Location
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
Grahic Jump Location
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.)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In