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Increasing rowing wheel efficiency of watercraft at high-speed

Authors: Yakimov N.M., Popov S.D., Chuvashev S.N. Published: 14.02.2016
Published in issue: #1(106)/2016  

DOI: 10.18698/0236-3941-2016-1-101-111

 
Category: Mechanical Engineering and Machine Science | Chapter: Machine Science, Drive Systems, and Machine Components  
Keywords: rowing wheel, high speeds of watercraft, computational experiment, blade shape, efficiency

Rowing wheels would be preferable for the advanced hovercrafts, but in order to achieve the desirable cost and energy efficiency, a hovercraft must be able to move at velocities higher than their critical velocity value of 20... 40 km/h. At such velocities, the conventional rowing wheels can have a negative efficiency factor. It is demonstrated through the calculations presented in the article. A series of conducted computational experiments allowed both determining and eliminating the origins of this effect by selecting the divided blades fixed at different angles in radial arrays. This allowed improving the blades hydrodynamical properties and provided a permanently high propulsive efficiency (about 50 %) within the range of 5 to 45 km/h. This opens up a prospect of using the rowing wheels for a wide range of watercrafts.

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