An evaluation of an empirical model for stall delay due to rotation for HAWTS

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The objective of this study was to evaluate the Corrigan and Schillings stall delay model for predicting rotor performance for horizontal axis wind turbines. Two-dimensional (2D) wind tunnel characteristics with and without stall delay were used in the computer program PROP93 to predict performance for the NREL Combined Experiment Rotor (CER) and a lower solidity commercial machine. For the CER, predictions were made with a constant-chord/twisted blade and a hypothetical tapered/twisted blade. Results for the constant-chord/twisted blade were compared with CER data. Predicted performance using this empirical stall-delay method provided significant increases in peak power over 2D post-stall airfoil characteristics. ... continued below

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12 p.; Other: 12 p./646 Kb

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Tangler, J. L. & Selig, M. S. July 1997.

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  • Tangler, J. L. National Renewable Energy Lab., Golden, CO (United States)
  • Selig, M. S. Univ. of Illinois, Urbana, IL (United States). Dept. of Aeronautical and Astronautical Engineering

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Description

The objective of this study was to evaluate the Corrigan and Schillings stall delay model for predicting rotor performance for horizontal axis wind turbines. Two-dimensional (2D) wind tunnel characteristics with and without stall delay were used in the computer program PROP93 to predict performance for the NREL Combined Experiment Rotor (CER) and a lower solidity commercial machine. For the CER, predictions were made with a constant-chord/twisted blade and a hypothetical tapered/twisted blade. Results for the constant-chord/twisted blade were compared with CER data. Predicted performance using this empirical stall-delay method provided significant increases in peak power over 2D post-stall airfoil characteristics. The predicted peak power increase due to stall delay for the CER was found to be quite large (20% to 30%) as a result of its high blade solidity. For a more typical, lower-solidity commercial blade the predicted peak power increase was 15% to 20%. As described in the paper, correlation with test data was problematic due to factors not related to the stall-delay model.

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12 p.; Other: 12 p./646 Kb

Notes

OSTI as DE97007947

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  • WindPower `97: annual conference and exhibition of the American Wind Energy Association (AWEA), Austin, TX (United States), 15-18 Jun 1997

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  • Other: DE97007947
  • Report No.: NREL/CP--440-23258
  • Report No.: CONF-970608--2
  • Grant Number: AC36-83CH10093
  • Office of Scientific & Technical Information Report Number: 513540
  • Archival Resource Key: ark:/67531/metadc695758

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  • July 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • March 28, 2016, 1:55 p.m.

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Tangler, J. L. & Selig, M. S. An evaluation of an empirical model for stall delay due to rotation for HAWTS, article, July 1997; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc695758/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.