Experimental investigation of windmills aerodynamics, torque regulation by use of elastic bindings

Putzu, Roberto (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Schmitt, Pierre-Louis (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Haroutunian, Anthony (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland)

In the framework of the Patmos windmills Restoration, an experimental investigation of the rotor aerodynamics was considered necessary for the windmill regulation. Historically, at high wind speed, the windmill’s shaft torque was regulated by manually rolling the triangular sails around their own spoke to reduce the lifting surface and decrease the aerodynamic loads. Continuous changes in wind speed could demand frequent human interventions on the rolled surface. In order to reduce these interventions, a self regulation mechanism involving the use of an elastic binding instead of a classical rope to tighten the sail was investigated. The analysis, performed in Reynolds similarity considering a constant real rotor speed of ! = 1.57 rad/s and a maximum real wind speed of 15.4 m/s, was conducted on the statical model of a single windmill blade in reduced scale. Tests were performed for several sail rolling conditions: with a rigid rope and with elastic stripes binding the sail to the blade frame. Results show that the increase in aerodynamic torque due to wind rise can be reduced by using elastic bindings.


Conference Type:
published full paper
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
Institute:
inSTI - Institut des Sciences et Technologies industrielles
Publisher:
Chicago, USA, 28 June - 1 July 2010
Date:
2010-06
Chicago, USA
28 June - 1 July 2010
Pagination:
12 p.
Published in:
Proceedings of AIAA Applied Aerodynamics Conference, 28 June - 1 July 2010, Chicago, USA
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2021-03-09, last modified 2021-03-12

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)