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

James L. Tangler, Michael S. Selig

Research output: Book/Report/Conference proceedingTechnical report


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%-30%) as a result of its high blade solidity. For a more typical, lower-solidity commercial blade the predicted peak power increase was 15%-20%. As described in this document, correlation with test data was problematic due to factors not related to the stall-delay model.
Original languageEnglish (US)
PublisherNational Renewable Energy Laboratory
Number of pages12
StatePublished - Jul 1997
EventWindpower '97 - Austin, United States
Duration: Jun 15 1997Jun 18 1997

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