高圧空気を駆動源とする船舶用推進裝置の性能向上に関する研究 : ノズル内への水流量増加による性能向上

概要

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In this paper we describe an experimental study of a new type of nozzle which generates a high-speed two-phase water jet as a propulsion device for a ship. In order to investigate the performance improvement of this device, two nozzles are designed : The first nozzle has a cascade with 4 blades instead of the bottom plate. The second nozzle has the same structure as that of the nozzle without a bottom, except that the high-pressure chamber is placed at the position where the bottom plate is removed. These nozzles were set in a towing tank and the thrust was measured for the various parameters such as the air injection angle, the pressure of the injection gas, and the towing speed. The thrust increases as compared with that of the nozzle without bottom. The maximum value of the propulsive efficiency is about 20% at the flow velocity of 1.5m/s. It was proven that the increase of the water flow rate in the nozzle is essential for improving the performance of this device.
社団法人日本機械学会の論文
1995-03-25