干粉灭火剂颗粒性质对两相湍射流影响的研究  

The influence of dry powder particle properties on the flow characteristics of two-phase turbulent jet

作　　者：戴昱 张贡赫 袁焱华 史鸿博 DAI Yu;ZHANG Gong-he;YUAN Yan-hua;SHI Hong-bo(Shanghai Fire Science and Technology Research Institute of MEM,Shanghai 200032,China;Fluid Machinery Engineering and Technology Research Center,Jiangsu University,Jiangsu Zhenjiang 212013,China;Shanghai Bei An Industry Company Limited,Shanghai 200032,China)

机构地区：[1]应急管理部上海消防研究所,上海200032 [2]江苏大学流体机械工程技术研究中心,江苏镇江212013 [3]上海倍安实业有限公司,上海200032

出　　处：《消防科学与技术》2022年第8期1119-1124,共6页Fire Science and Technology

基　　金：国家自然科学基金项目(52106043,52079057);江苏大学高级人才启动基金项目(20JDG058)。

摘　　要：为研究干粉灭火剂颗粒性质参数对气固两相射流流动特性的影响规律,基于ANSYS Fluent计算平台,采用欧拉-欧拉模型对湍射流外流场进行三维数值模拟研究。通过试验验证数值模拟模型及结果的准确性,分析干粉颗粒浓度和密度参数对喷射器外部气固两相流场及地面扩散效应的影响规律。研究结果表明,不同干粉颗粒浓度和密度对气固两相喷射特性及颗粒空间分布具有显著影响。颗粒浓度与射流冲击后粉末覆盖区域面积及固相浓度呈正相关,气相速度场剧烈变化。随着颗粒密度的增大,喷射距离呈现增大趋势,地面粉末分布由U形逐步向V形转变,干粉颗粒集中性更佳。In order to study the effects of the dry powder particle properties on the flow characteristics of the gas-solid twophase turbulent jet flow, the Eulerian-Eulerian model is used to simulate the outflow field based on the software ANSYS Fluent.The model and the results are verified. The influences of the particle concentration and particle density on the two-phase flow field and the discharge performance of the powder jet are analyzed. It is clearly revealed that the powder injection with different particle concentrations and particle density exhibit significant influence on the behavior and characteristics of the particleladen jet flow. As the particle concentration increases, the air velocity field changes dramatically, and the jet solid volume distribution value increases significantly. With the increase of particle density, the injection distance increases, and the spread of solid particles become narrower with a transition from Ushaped to V-shaped structure on the ground.

关 键 词：干粉浓度 干粉密度 气固两相流 流动特性 扩散特性 数值模拟 

分 类 号：X932[环境科学与工程—安全科学] O646.21[理学—物理化学]