全氟己酮灭火剂局部应用灭火技术研究

以全氟己酮灭火剂局部应用灭火技术为研究对象,基于旋芯喷嘴低压大流量雾化的特性,利用Fluent进行了该类喷嘴的外流场仿真,完成了雾化后的灭火剂浓度分布特性仿真分析,并确定了浓度分界点;结合吉利兰半经验公式,推导出了针对不同雾化半角的喷嘴流量计算公式,并建立了局部应用灭火计算方法;结合实验,验证了局部应用灭火技术方法的准确性。研究表明:高度变高、雾化半角变大、温度变高、粒径变小,均会导致所需灭火流量的增大,其中雾化半角对灭火流量的影响最大;结合浓度分布特性和喷嘴流量计算公式建立的局部应用灭火计算方法,能够实现可靠灭火。

Study on local application fire extinguishing technology of perfluoro-2-methyl-3-pentanone

Taking the local application fire extinguishing technology of perfluoro- 2-methyl- 3- pentanone as the research object, based on the characteristics of low-pressure and large-flow atomization of the rotary core nozzle, used Fluent to carry out the simulation of the external flow field of this nozzle, and completed the simulation analysis of the distribution characteristics of atomized fire extinguishing agent, and determined concentration cut-off points. Combined with Gilliland semi-empirical formula, derived the calculation formula of nozzle flow for different atomizing half angles, and established the calculation method of local application of fire extinguishing.Combined with the experiment, verified the accuracy of local application of fire extinguishing technology. The results show that higher height, larger atomizing half Angle, higher temperature, and smaller particle size all lead to the increase of the required fire extinguishing flow, among which the atomizing half angle has the greatest influence on the fire extinguishing flow. The local applied fire extinguishing calculation method established by combining the concentration distribution characteristics and the calculation formula of nozzle flow can realize the reliable fire extinguishing.