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为探究不同驱动压力及喷射角度对干粉喷洒特性的影响，搭建干粉喷洒试验平台，采用离散相模型(Discrete Phase Model, DPM)对喷嘴外部气固两相流流动进行模拟，系统分析气固两相流的流动特性。在搭建的干粉试验平台上开展干粉喷洒试验，利用采集盒收集干粉并计算相应灭火浓度，对不同影响因素下干粉有效灭火面积进行分析，并探究有效灭火面积内干粉分布均匀度。结果表明：驱动压力越大，干粉扩散分布区域整体均匀度越高，在0.6 MPa压力驱动下，有效灭火面积最大；随着喷嘴与竖直方向角度增大，干粉扩散分布区域整体均匀度升高，70°喷射角下，有效灭火面积最大。研究结果可为不同火情时改变驱动压力或喷射角度提供参考。
Abstract：The fire extinguishing efficiency of a pressure-controlled fire extinguishing device is influenced by the coupling characteristics of gas-solid two-phase flow. During the nitrogen-driven dry powder spraying process, factors such as particle agglomeration, energy dissipation, and turbulent disturbances can result in an uneven distribution of the fire extinguishing agent. To investigate how varying driving pressures and spray angles affect the characteristics of dry powder spraying, a dedicated testing platform was developed. Utilizing this experimental setup, simulations were conducted with the Discrete Phase Model(DPM) and SST k-ω turbulence model to analyze the gas-solid two-phase flow outside the nozzle. This study explores the effects of different driving pressures and spray angles on the diffusion characteristics of the fire extinguishing agent particles. The flow characteristics of gas-solid two-phase flow were systematically analyzed. Dry powder spraying tests were conducted using the test platform, employing a single-factor-multi-condition approach that varied driving pressure and spray angle. The dry powder was collected in a collection box, allowing for the calculation of the corresponding fire extinguishing concentration. An analysis of the effective fire extinguishing area of the dry powder under different influencing factors was performed, along with an exploration of the uniformity of dry powder distribution within this effective area. The results indicate that higher driving pressures lead to improved overall uniformity in the distribution area of dry powder diffusion. The effective fire extinguishing area is maximized at a pressure of 0.6 MPa. Additionally, the overall uniformity of dry powder distribution increases as the nozzle and vertical angle are adjusted, with the largest effective fire extinguishing area observed at a spray angle of 70°. These findings offer valuable insights for optimizing driving pressure and spray angle under varying fire conditions.
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基本信息:
DOI：10.13637/j.issn.1009-6094.2025.0307
中图分类号:TQ569
引用信息:
[1]储胜利,郑文培,刘亦心,等.干粉灭火装置的干粉扩散分布特性研究[J].安全与环境学报,2026,26(01):249-258.DOI:10.13637/j.issn.1009-6094.2025.0307.
基金信息:
国家重点研发计划项目(2023YFC3009200); 中国石油天然气集团有限公司科技项目(2023DJ6508)
2026-01-17
2026-01-17