| Summary: | 博士 === 國立雲林科技大學 === 工程科技研究所博士班 === 94 === The progress of the applications of water mist systems in fire suppression has been substantial over the last decade. The study has been undertaken to identify potential efficacy improvements for water mist fire suppression systems. The extinguishing mechanisms and the role of spray characteristics in fire suppression has not been well understood and identified. Water mist does not behave like a perfect gaseous agent in fire suppression. The effectiveness of a water mist system in fire suppression is dependent on the distribution of droplet size, water flux density, and spray dynamics.
An experiment was conducted in this investigation to analyze the spray dynamics including the water supply pressure, swirl chamber geometry, and jet nozzle diameters. Different types of test specimens were fabricated following the design parameters. The area ratio of swirl chamber and jet nozzle, Ar, dominants the spray characteristics of water mist systems. The complete experimental data may increase the development of water mist systems much more efficient and effective.
The aim of the research is designing a nozzle head to produce different water droplet sizes under same water supply rates. For the aid of controlling or distinguishing different fire scenarios which have multiple fuel sources, bad vent and obstacle condition environment. Also, the finest water particle can absorb the effects of heat radiant and smoking dusts, reduce heat radiant propagation of fire scenario, prevent fire-fighters suffering heat stress and benefit the fire victims to exist. The nozzle is not only machining easy, producing low cost but also having excellent fire-control ability comparing with other average mean particle diameter nozzles. Especially for some high science technique production and particular operating environment, it could have the broad research space. Also, it substitutes the single nozzle head to a newer fire water mist nozzle. This designed nozzle has been qualified the patent of Taiwan and China simultaneously in 2005.
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