Email RIS file
Bookmark
Report an Issue

Using time-frequency and wavelet analysis to assess turbulence/rotor interactions [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2000.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
vp : digital, PDF file
Additional Creators
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
Large loading events on wind turbine rotor blades are often associated with transient bursts of coherent turbulent energy in the turbine inflow. These coherent turbulent structures are identified as peaks in the three-dimensional, instantaneous, turbulent shearing stress field. Such organized inflow structures and the accompanying rotor aeroelastic responses typically have time scales of only a few seconds and therefore do not lend themselves for analysis by conventional Fourier spectral techniques. Time-frequency analysis (and wavelet analysis in particular) offers the ability to more closely study the spectral decomposition of short period events such as the interaction of coherent turbulence with a moving rotor blade. In this paper, the authors discuss the initial progress in the application of time-frequency analysis techniques to the decomposition and interpretation of turbulence/rotor interaction. The authors discuss the results of applying both the continuous and discrete wavelet transforms for their application. Several examples are given of the techniques applied to both observed turbulence and turbine responses and those generated using numerical simulations. They found that the presence of coherent turbulent structures, as revealed by the inflow Reynolds stress field, is a major contributor to large load excursions. These bursts of coherent turbulent energy induce a broadband aeroelastic response in the turbine rotor as it passes through them.
Report Numbers
E 1.99:nrel/cp-500-27151
nrel/cp-500-27151
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/05/2000.
"nrel/cp-500-27151"
19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium, Reno, NV (US), 01/10/2000--01/13/2000.
Osgood, R.M.; Kelley, N.D.; Bialasiewicz, J.T.; Jakubowski, A.
National Renewable Energy Lab., Golden, CO (US)
Funding Information
AC36-99GO10337
View MARC record | catkey: 14989934