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oai:ebiltegia.mondragon.edu:20.500.11984/53452024-03-05T12:09:05Zcom_20.500.11984_473col_20.500.11984_478

Assessing the statistical validity of momentum-deficit-based measurements in turbulent configurations Zarketa-Astigarraga, Ander Martin-Mayor, Alain Martinez Agirre, Manex Penalba, Markel Aerodynamic coefficients Drag measurement Turbulence wind tunnel Statistical analysis Uncertainty analysis An application-agnostic procedure is outlined for checking the validity of momentum-deficit-based drag measurements performed under different turbulent conditions in a wind tunnel. The approach defines a two-step methodology: the first stage characterizes the turbulent flowfield generated downstream a passive grid through a set of statistical parameters. Acceptable values for such parameters are determined by means of two criteria: compliance with the threshold value set by an analysis of the experimental uncertainties, and fulfilment of the isotropic condition for ensuring a well-established turbulent flowfield. Those two prerequisites define a set of turbulent configurations for which the momentum-deficit-based technique applies feasibly. The second stage of the procedure is configuration-specific, and undertakes drag measurements upon a NACA0021 airfoil subjected to a set of different turbulent configurations. It is shown that performing measurements under invalid turbulent conditions leads to inconsistent drag curves, which serves for defining a validity map based on the testable cases. 2021-07-15T06:12:39Z 2021-07-15T06:12:39Z 2021 http://purl.org/coar/resource_type/c_6501 0263-2241 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=164376 https://hdl.handle.net/20.500.11984/5345 eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2021 The Author(s) Elsevier Ltd.