サーフェスプロペラの推進性能に関する実験的研究

概要

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It is generally known that the screw propeller has the highest efficiency in the marine Propulsive devices. For fully submerged propeller it is well known that cavitation phenomena on propeller blades become inevitable at high speed and deteriorates the propeller efficiency. Surface piercing propellers, also known as partially submerged propellers, for high-speed vessels completely suppress cavitation. But surface piercing propellers lack a theoretical method of analysis and design, therefore they do not become the popular propulsive devices. In this paper, with the aim of the widespread use of surface piercing propeller, the propeller open characteristics are made using 3 kinds of surface piercieng propellers (wedge section) and the controllable-pitch propeller (aerofoil section), varying the horizontal rake angle of propeller shaft and propeller immersion ratio. It is found that propeller efficiency of surface piercing propeller is higher .as compared with another type of propellers in the high speed range and the addition of appropriate horizontal rake angle increases propeller efficiency. Finally, the design chart for initial surface piercing propeller is made and the possibilities of more increase of propulsive performance are discussed.
社団法人日本船舶海洋工学会の論文
2002-03-25