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Application of the ONERA model of dynamic stallA semiempirical model to predict the unsteady loads on an airfoil that is experiencing dynamic stall, is investigated. The mathematical model is described from an engineering point of view, demonstrates the procedure for obtaining various empirical parameters, and compares the loads predicted by the model with those obtained in the experiment. It is found that the procedure is straightforward, and the final calculations are in qualitative agreement with the experimental results. Comparisons between calculations and measurements also indicate that a decrease in accuracy results when the values of both the reduced frequency and the amplitude of oscillation are large. Potential quantitative improvements in the accuracy of the calculations are discussed for accounting of both the hysteresis in the static data and the effects of stall delay in the governing equations.
Document ID
19850004554
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Mcalister, K. W. (NASA Ames Research Center Moffett Field, CA, United States)
Lambert, O. (Service Technique des Programmes Aeronautiques Paris, United States)
Petot, D. (ONERA Chatillon, France)
Date Acquired
September 5, 2013
Publication Date
November 1, 1984
Subject Category
Aerodynamics
Report/Patent Number
AVSCOM-TR-84-A-3
NASA-TP-2399
AD-A159502
NAS 1.60:2399
A-9824
Accession Number
85N12862
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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