Experimental uncertainty decompositions of aerodynamic coefficients affected by operative condition variations
| Autor: | Manex Martinez-Agirre, Ander Zarketa-Astigarraga, Alain Martin-Mayor |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Airfoil
Lift-to-drag ratio Applied Mathematics 020208 electrical & electronic engineering 010401 analytical chemistry lift and drag coefficients wind tunnel 02 engineering and technology Mechanics Aerodynamics Condensed Matter Physics 01 natural sciences operative conditions 0104 chemical sciences Experimental uncertainty analysis 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Instrumentation uncertainty analysis Uncertainty analysis Mathematics Wind tunnel |
| Zdroj: | eBiltegia Repositorio digital de Mondragon Unibertsitatea instname Universidad de Mondragón |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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