著者

茨木 博史

出版者

四日市大学

雑誌

四日市大学論集 (ISSN:13405543)

巻号頁・発行日

vol.26, no.2, pp.184-173, 2014 (Released:2020-09-10)

著者

茨木 博史

出版者

日本フランス語フランス文学会中部支部

雑誌

日本フランス語フランス文学会中部支部研究論文集 (ISSN:02853795)

巻号頁・発行日

vol.41, pp.127-140, 2017 (Released:2019-07-25)

著者

茨木 博史

出版者

四日市大学学会経済学部部会

雑誌

四日市大学論集 (ISSN:13405543)

巻号頁・発行日

vol.25, no.1, pp.142-126, 2012-09

著者

茨木 博史

出版者

四日市大学

雑誌

四日市大学論集 (ISSN:13405543)

巻号頁・発行日

vol.25, no.1, pp.142-126, 2012

著者

茨木 博 橋本 巨

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.75, no.757, pp.2596-2603, 2009-09-25

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This study is concerning the optimum design of a water nozzle for firefighting equipment used to protect large indoor spaces and high-rise buildings. Water nozzles for such use are required to have a long range of reach and/or a wide coverage. Such performance can be obtained by simply increasing the flow rate, but that is caused substantial pressure loss by the fluid friction within the nozzle and the pipe. The objective of this study is to obtain a water nozzle with minimum fluid friction by optimum design, as a result the size of piping, pump and water reservoir for firefighting equipment can be minimized. The conventional water nozzle used in firefighting is called the smooth bore nozzle, which have a wedge-shape profile whose diameter decreasing toward the exit. However, whether or not this shape is optimum have not been known. In this study, a method is presented to obtain a friction-minimum nozzle profile, while setting the inlet-and outlet-diameters and the length of the nozzle as fixed parameters. It was found that the half-spindle-type nozzle, whose diameter is almost constant along the length but quickly decreases at the exit, shows the smallest friction than the other profiles (i.e. smooth-bore, straight and concaved), therefore showing maximum arrival distance.