摘要：在不改变实验舱灭火系统结构和设置的条件下,对新型灭火剂超细干粉的可替代性进行研究;基于流体力学和气-固两相流的基本理论,结合k-ε双方程湍流模型和颗粒轨道模型,建立用于描述超细干粉灭火剂灭火过程中施放、流动和扩散过程的数学模型;利用该模型,对实验舱体内超细干粉灭火剂的施放、流动和扩散过程进行模拟分析,得到详细的流场和浓度分布情况。结果表明:灭火剂从喷嘴施放后,在舱体内逐渐扩散形成全淹没状态;超细干粉灭火剂平均浓度高于要求的灭火浓度,用超细干粉灭火剂可以替代哈龙型灭火剂。

关键词：超细干粉；灭火剂；气-固两相流;数值模拟

Abstract： The substitutability of ultrafine powder extinguishing agents was researched with the original structure and equipment of the experimental cabin. Based on the computational fluid dynamics and two-phase flow theory, the mathematic model combined with k -ε two equations turbulent model and particle trajectory model was developed to describe the discharge, flow and diffusion of ultrafine powder extinguishing agents in an experimental cabin. The discharge, flow and diffusion of ultrafine powders were simulated with the model in the experimental cabin. The detailed information of the flow field and ultrafine powders concentration distribution were obtained. The results show that the extinguishing agents are full submerged after discharging. The average concentration of ultrafine powder extinguishing agents in experimental cabin is higher than the required extinguishing concentration. Ultrafine powder extinguishing agents are able to replace Halon extinguishing agents without any change of the existing fire extinguishing system. 

Keywords: ultrafine powder； extinguishing agent； gas-solid flow； numerical simulation