内航中小形船の輸送エネルギ効率の現状とその改善

概要

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At present small- and medium-sized vessels under 2000G/T occupy 97.3% of the total number and 65% of the total gross tonnage of Japanese coastwise shipping, and they carry 65% of cargo volume (ton·kilometers) by homewaters. Firstly this report researches the present situation of the fuel consumption and reveals that those small- and medium-sized vessels consume about 80% of the fuels for the freight transportation by homewaters. Therefore small- and medium-sized vessels, especially cargo-boats and tankers, should be paid attention for the fuel economy. So secondly the actual condition of the transport energy efficiency of those vessels is researched. The three main factors, which determine the transport energy efficiency, that is, hull resistance, propeller efficiency, and payload-to-total weight ratio are discussed in regard to present vessels. The result shows there is some room for the improvement of about three main factors, especially, with respect to the hull resistance and the propeller efficiency. Finally the report estimates that, if the former would be reduced to the level estimated according to the Yamagatas method, and if, as for the latter, the propeller diameter would be increased so far as the after draught at ballast voyage permits, then the amounts of fuel consumption could be cut down to about 64% of the present one.
社団法人日本マリンエンジニアリング学会の論文