MyJournals Home  

RSS FeedsEnergies, Vol. 11, Pages 3328: Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications (Energies)

 
 

30 november 2018 12:00:03

 
Energies, Vol. 11, Pages 3328: Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications (Energies)
 


A vertical axis drag-based turbine is proposed that allows for an improved performance by feathering its blades during recovery strokes to eliminate adverse blade forces. The turbine blades resemble flat plates and pitch by 90 ? between the two turbine strokes using a novel dual-cam mechanism. This passive mechanism orients the blades vertically during the drive stroke for maximum effective area and horizontally for minimum effective area during the recovery stroke. This allows maximizing the positive drive stroke force and minimizing the recovery stroke losses, in turn maximizing the net energy capture and the turbine performance. It is called the cyclic pitch turbine, and a mathematical model is developed that predicts the turbine performance. It shows that the turbine is self-starting for all orientations and has a higher and more uniform static torque coefficient than the popular Savonius turbine. The dynamic analysis also indicates a higher performance, and the predicted values for torque and power coefficients match very closely with those from water channel and wind tunnel experiments on a prototype. Results of testing several blade shapes indicate that airfoil section blades with long and narrow continuous shapes that have less area towards the blade’s tip result in higher performance.


 
191 viewsCategory: Biophysics, Biotechnology, Physics
 
Energies, Vol. 11, Pages 3329: Design Considerations for Parallel Differential Power Processing Converters in a Photovoltaic-Powered Wearable Application (Energies)
Energies, Vol. 11, Pages 3327: Control Strategy Proposal for Modular Architecture of Power Supply Utilizing LCCT Converter (Energies)
 
 
blog comments powered by Disqus


MyJournals.org
The latest issues of all your favorite science journals on one page

Username:
Password:

Register | Retrieve

Search:

Physics


Copyright © 2008 - 2024 Indigonet Services B.V.. Contact: Tim Hulsen. Read here our privacy notice.
Other websites of Indigonet Services B.V.: Nieuws Vacatures News Tweets Nachrichten