実船における船尾流速分布の計測 : 主として計測法について

概要

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It is important to have the knowledge of the velocity distribution ahead the actual propeller in discussing the propulsive performance of ships, especially the scale effect of it. Up to now, there are few data on the velocity distribution behind the ship, and it is said that one of the big problems in measuring the velocity is how to measure it. We investigated many kinds of velocity-measurement techniques from the point of view of the given conditions, and found out that the Fukamachi's system, which may be called for convenience as air-blow system against the usual system, pulling up the water, to be called as water system, was considered to be suitable for this purpose. The report is mainly dealt with the adopted techniques including the results of vibration tests carried out in the No. 2 tank of S.R.I. on the actual arm to hold pitot tubes. The apparatus and system of the experiments are as follows; 1) Pitot tubes: 5 hole Pitot tube ×5 JIS type Pitot tube ×2 2) Medium to transmit pressure: air 3) Liquids in manometer: Hg and Tetra・bromoethane 4) Record method: 8mm cine, 35mm camera, Poraloid camera and electrical differential pressure transducer As an example, contours of velocity distributions are shown. Finally, some considerations concerning the measuring method are added.
社団法人日本船舶海洋工学会の論文
1971-07-31