船舶の着氷について(その4)

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In the third report, the author presented the results of his comparison between the growth rate and amount of ice accreted on patrol boats obtained from icing experiments conducted at sea and the rate and amount of ice estimated by the theories of forced convection of heat developed in the first and second reports. It is also advanced that the growth rate and amount of ice accreted on any vessels, can be estimated approximately under any ambient air temperature, wind velocity and duration of icing at sea through the results of these studies. This paper describes some materials for ambient air temperatures and relative wind velocities during icing on ships, which have been collected through questionnaires entrusted to various types of patrol boats in the northern waters around our country over several years. The weather condition of the growth of ice accreted on ship has been made considerably clearer by these investigations. Therefore, assuming conditional ambient air temperature, wind velocity and duration of icing on ships from the abovementioned materials, and picking up four vessels, whose navigations are scheduled in the northern waters, the amounts and heights of centres of gravity of ice accreted on them are estimated, and the change of ships' stability between before and after icing is also presented. It is also indicated that the centre of gravity of ice accreted on ship can be estimated satisfactorily by these theories. Finally, the author has made a comparison of the two kinds of amounts and centres of gravity of ice accreted on various types of patrol boats and two fishing vessels estimated by these theories and by the USSR icing norms respectively. It is pointed out through the results of the comparison that the USSR icing norms contain some defects basically and new icing norms are proposed by the author on the basis of the already reported investigations and studies.
社団法人日本船舶海洋工学会の論文

船舶の着氷について(その4)

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