An Innovative Treadmill-Magnus Wind Propulsion System for Naval Ships
Ahmad Sedaghat, Mohammad Ali Badri, Mohsen Saghafian and Iman Samani
Affiliation: Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Keywords: CFD, magnus effect, NACA0020 aerofoil, propulsion, treadmill motion.
The Magnus force was successfully employed by Flettner in his ship Buckau operating with two large propelling
cylinders. The spinning cylinders produced propulsive force from the wind on seas as a clean and free source of energy.
The rise of fossil fuel costs, extinction of fossil fuel resources, and environmental issues such as global warming and
pollutions produced by fossil fuels have caused a renew interest in Flettner type propulsion in naval ships. This is becoming
a hot topic in Europe and the rest of world. Many other applications of producing high lift values from spinning symmetrical
cylinders have failed due to high values of drag force and also rapid increase of frictional torques. In this patent,
the new application of Treadmill-Magnus, wind driven propulsion system is introduced which can be effectively used for
any size ships. To show validity of the concept, the NACA0020 aerofoil section with treadmill skin is computationally investigated
at the low Reynolds number of 8.2x104. The viscous fluid flow solutions were obtained at variety of treadmill
speeds of the aerofoil skin and different incident angles. The results show that high lift to drag ratios may be obtained using
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