Appropriate Dynamic-Stall Models for Performance Predictions of VAWTs with NLF Blades

Autor: Christian Masson, Christophe Leclerc, Ion Paraschivoiu
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: International Journal of Rotating Machinery, Vol 4, Iss 2, Pp 129-139 (1998)
Druh dokumentu: article
ISSN: 1023-621X
1023621X
DOI: 10.1155/S1023621X98000116
Popis: This paper illustrates the relative merits of using Natural Laminar Flow (NLF) airfoils in the design of Vertical Axis Wind Turbines (VAWT). This is achieved by the application of the double-multiple-streamtube model of Paraschivoiu to the performance predictions of VAWTs equipped with conventional and NLF blades. Furthermore, in order to clearly illustrate the potential benefit of reducing the drag, the individual contributions of lift and drag to power are presented. The dynamic-stall phenomena are modelled using the method of Gormont as modified by several researchers. Among the various implementations of this dynamic-stall model available in the literature, the most appropriate and general for NLF applications has been identified through detailed comparisons between predicted performances and experimental data. This selection process is presented in the paper. It has been demonstrated that the use ofNLF airfoils in VAWT applications can lead to significant improvements with respect to conventional design only in a very low wind speed range, the extent of which is negligible with respect to the VAWT operational wind speeds.
Databáze: Directory of Open Access Journals
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