著者

岡崎 航介 吉田 肇 入澤 優磨 櫻庭 隆貴

出版者

海上保安大学校

雑誌

海上保安大学校研究報告. Part 2, 理工学系 = Report of Japan Coast Guard Academy. 海上保安大学校 編 (ISSN:02872951)

巻号頁・発行日

vol.57, no.1, pp.41-47, 2013

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Not a few fires in the engine room of ships are caused from the ignition of spilled oil on the hot part of machines such as turbo-chargers, boilers etc. Authors have continued to investigate ignition and combustion phenomenon of oils on the hot surface of a metal plate with various conditions of the surface and many kinds of fuels for understanding of the mechanism of fires in engine rooms. However, it could not be well-considered about flow of the air in the reaction region because of the design of the experimental apparatus, although it is important for the ignition and combustion. In this study. CFD (Computational Fluid Dynamics) calculation using OpenFOAM is introduced for consideration of experimental results of the fuel ignition tests and some simple cases are simulated.

著者

倉本 和興 田中 隆博

出版者

海上保安大学校

雑誌

海上保安大学校研究報告. Part 2, 理工学系 = Report of Japan Coast Guard Academy. 海上保安大学校 編 (ISSN:02872951)

巻号頁・発行日

vol.58, no.1, pp.1-8, 2014

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In the previous report,we proposed a new measuring technique that the number of pulses per unit time was counted by using the general-purpose image processing software after acquiring 16-bit grayscale square image from the temporal acoustic data,as an evaluation method of the number of peculiar cracking noise,whith is called "TEMPURA noise". In addition,we measured the underwater acoustic data with the marine environment at KOJIMA pier of Japan Coast Guard Academy in the every hour for 25 hours in one day of each season and discussed the relationship between the number of pulses and the marine environment value. In this study, the automatic measurement device of the underwater acoustic data and marine environment value was constructed in order to carry out the continuous measurement throughout for a few days. The consecutive measurements for 4 days(for 77 hours)of each season in winter,spring,summer,autumn were carried out in the fixed point at KOJIMA pier,and the relationship between the changes of pulse generation of snapping shrimp and marine environment values is reconsidered.