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Title
Experimental uncertainty decompositions of aerodynamic coefficients affected by operative condition variationsPublished Date
2020Publisher
Elsevier Ltd.Keywords
uncertainty analysisoperative conditions
wind tunnel
lift and drag coefficients
Abstract
A twofold analysis is performed on an experimental set-up comprising a low-Reynolds wind tunnel, with the aim of quantifying the effect of measurand uncertainties and operative condition variations in ... [+]
A twofold analysis is performed on an experimental set-up comprising a low-Reynolds wind tunnel, with the aim of quantifying the effect of measurand uncertainties and operative condition variations in the lift and drag curves of a NACA0021 airfoil. The first part of the study focuses on an uncertainty analysis of basic measurands used for calculating standard aerodynamic magnitudes, showing the individual contributions of each of the factors affecting the overall uncertainty ranges. The second part intends to show how those uncertainties are propagated to lift and drag coefficients, and to calculate the effect of varying operative conditions on those curves. It is found that, when changes in operative conditions are left unattended, their influence on derived magnitudes may grow as large as to cause the resultant data to lie outside the estimated uncertainty intervals. Additionally, those variations are shown to depend non-linearly on the operative condition changes that produce them. [-]
Publisher’s version
https://doi.org/10.1016/j.measurement.2020.107941ISSN
0263-2241Published at
Measurement Vol. 165. N. artículo 107941, 2020Document type
ArticleVersion
Postprint – Accepted ManuscriptRights
© 2020 Elsevier Ltd.Access
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