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http://dx.doi.org/10.7731/KIFSE.2018.32.4.017

Effect of the Presence of Sub-pipes on the Performance of Water Nozzle  

Yi, Young-Woo (School of Mechanical Engineering, Pusan National University)
Lim, Hee-Chang (School of Mechanical Engineering, Pusan National University)
Publication Information
Fire Science and Engineering / v.32, no.4, 2018 , pp. 17-24 More about this Journal
Abstract
This paper presents a numerical analysis of flow inside a water nozzle for fire fighting and observes the effect of the variation in primary components on internal flow. In order to observe the performance of water nozzles, they have been systematically designed and modelled, applying boundary conditions obtained from field experiments (inlet pressure at pump : 4 bar, and pressure outlet : atmospheric pressure). In addition, the governing equations were calculated to obtain velocity, pressure inside the nozzle. Two main parameters (the presence and length of sub-pipes) were considered with the aim to observe the detail internal flow characteristics. It is found that the base model is not significant on flow characteristics, but a negative effect (i. e. the reverse flow) at the entrance region of sub-pipe. On the other hand, the reverse flow was vanished when making the length of sub-pipe double.
Keywords
Water nozzles; Sub-pipes; Pressure drop; Flow characteristics;
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