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Title: Lifting surface performance analysis for horizontal axis wind turbines

Abstract

This report describes how numerical lifting-surface theory is applied to the calculation of a horizontal-axis wind turbine's aerodynamic characteristics and performance. The report also describes how such an application is implemented as a computer program. The method evolved from rotary-wing and helicopter applications and features a detailed, prescribed wake. The wake model extends from a hovering-rotor experimental generalization to include the effect of the windmill brake state on the radial and axial displacement rates of the trailing vortex system. Performance calculations are made by coupling the lifting-surface circulation solution to a blade-element analysis that incorporates two-dimensional airfoil characteristics as functions of angle of attack and Reynolds number. Several analytical stall models are also provided to extend the airfoil characteristics beyond the limits of available data. Although this work focuses on the steady-performance problem, the method includes ways to investigate the effects of wind-shear profile, tower shadow, and off-axis shaft alignment. Correlating the method to measured wind-turbine performance, and comparing it to blade-element momentum theory calculations, validate and highlight the extreme sensitivity of predictions to the quality of early post-stall airfoil behavior.

Authors:
Publication Date:
Research Org.:
Solar Energy Research Inst., Golden, CO (USA)
OSTI Identifier:
6436236
Report Number(s):
SERI/STR-217-3163
ON: DE87001176
DOE Contract Number:  
AC02-83CH10093
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; HORIZONTAL AXIS TURBINES; AERODYNAMICS; PERFORMANCE; AIRFOILS; COMPUTER CALCULATIONS; NUMERICAL SOLUTION; FLUID MECHANICS; MACHINERY; MECHANICS; TURBINES; TURBOMACHINERY; WIND TURBINES; 170602* - Wind Energy Engineering- Turbine Design & Operation

Citation Formats

Kocurek, D. Lifting surface performance analysis for horizontal axis wind turbines. United States: N. p., 1987. Web.
Kocurek, D. Lifting surface performance analysis for horizontal axis wind turbines. United States.
Kocurek, D. 1987. "Lifting surface performance analysis for horizontal axis wind turbines". United States.
@article{osti_6436236,
title = {Lifting surface performance analysis for horizontal axis wind turbines},
author = {Kocurek, D},
abstractNote = {This report describes how numerical lifting-surface theory is applied to the calculation of a horizontal-axis wind turbine's aerodynamic characteristics and performance. The report also describes how such an application is implemented as a computer program. The method evolved from rotary-wing and helicopter applications and features a detailed, prescribed wake. The wake model extends from a hovering-rotor experimental generalization to include the effect of the windmill brake state on the radial and axial displacement rates of the trailing vortex system. Performance calculations are made by coupling the lifting-surface circulation solution to a blade-element analysis that incorporates two-dimensional airfoil characteristics as functions of angle of attack and Reynolds number. Several analytical stall models are also provided to extend the airfoil characteristics beyond the limits of available data. Although this work focuses on the steady-performance problem, the method includes ways to investigate the effects of wind-shear profile, tower shadow, and off-axis shaft alignment. Correlating the method to measured wind-turbine performance, and comparing it to blade-element momentum theory calculations, validate and highlight the extreme sensitivity of predictions to the quality of early post-stall airfoil behavior.},
doi = {},
url = {https://www.osti.gov/biblio/6436236}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {6}
}

Technical Report:
Other availability
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