Daniele, Elia (2013) Numerical and experimental investigation of low Reynolds number wind turbine airfoils under stall and post-stall conditions. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Numerical and experimental investigation of low Reynolds number wind turbine airfoils under stall and post-stall conditions
Creators:
CreatorsEmail
Daniele, Eliaelia.daniele@unina.it
Date: 3 May 2013
Number of Pages: 139
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Industriale
Scuola di dottorato: Ingegneria industriale
Dottorato: Ingegneria aerospaziale, navale e della qualità
Ciclo di dottorato: 25
Coordinatore del Corso di dottorato:
nomeemail
De Luca, Luigiluigi.deluca@unina.it
Tutor:
nomeemail
Coiro, Domenico P.domenico.coiro@unina.it
Date: 3 May 2013
Number of Pages: 139
Uncontrolled Keywords: post-stall, low Reynolds number, wind turbine
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/03 - Meccanica del volo
Aree tematiche (7° programma Quadro): ENERGIA > Produzione di energia elettrica da fonti rinnovabili
Date Deposited: 08 Apr 2013 14:59
Last Modified: 22 Jul 2014 09:12
URI: http://www.fedoa.unina.it/id/eprint/9232
DOI: 10.6092/UNINA/FEDOA/9232

Abstract

This work concerns a numerical and experimental investigation of low Reynolds number wind turbine airfoils under stall and post-stall conditions. A verification of high angle of attack semi empirical models, namely Viterna-Corrigan and Aerodas from Spera, is needed to assess the input data reliability for Blade Element Momentum (BEM) based Vertical Axis Wind Turbine (VAWT) performance code and also the performance predictions for Horizontal Axis Wind Turbine (HAWT) where passive stall control must be guaranteed by a reliable post-stall aerodynamic coefficients distribution. A great challenge is inherited by the low Reynolds number related to the phenomenon (considering VAWT for urban installation and small size generation) and the presence of possible laminar bubble burst induced stall. In case for which no laminar bubble promotion is observed on the stall behavior, still a strong dependency on turbulence intensity is present for the maximum lift coefficient attainable. Attention is also paid to not clean VAWT operating conditions as those occurring far from maintenance period in which a transition from laminar to turbulent flow regime could be supposed to be promoted by dirty material accumulation on the blade leading edge region. Computational Fluid Dynamics (CFD) simulations using OpenFOAM library and a transitional turbulence model are used as a comparison for the experimental results derived from the test campaign conducted in the closed test section wind tunnel facility of the Department of Industrial Engineering of University of Naples, for both free and fixed transition condition. A further comparison with Delft University experiments is performed for similar Reynolds number, and moreover, an analysis of blockage effect by means of another test campaign in the open test section wind tunnel facility is conducted to understand the influence of wind tunnel walls on secondary lift coefficient peak and maximum drag coefficient value.

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