基于PIV的气动式细水雾流场研究  

Research on pneumatic water mist flow field based on PIV

作　　者：柳承徽 陈先锋[1] 张威[1] 徐乐先 赵齐 黄楚原 LIU Chenghui;CHEN Xianfeng;ZHANG Wei;XU Lexian;ZHAO Qi;HUANG Chuyuan(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China)

机构地区：[1]武汉理工大学安全科学与应急管理学院,武汉430070

出　　处：《中国安全科学学报》2020年第7期120-126,共7页China Safety Science Journal

基　　金：国家重点研发计划项目(2018YFC0808500);国家自然科学基金资助(51774221)。

摘　　要：为探究不同气压下气动式细水雾流场的形态变化,分别使用质量流量控制器和粒子图像测速(PIV)技术,测定气动式双流体细水雾喷嘴气液质量流量比(GLR),分析气体驱动压力0.1~0.3 MPa范围内的水雾流场特性。结果表明:在0.1~0.4 MPa的氮气压力下,气动式双流体细水雾喷嘴的无量纲GLR值与氮气压力呈现线性增长关系;GLR会影响喷嘴内部两相流的特性、液体破裂的机制、液滴动力学以及最终的液滴尺寸分布;当气体压力从0.1 MPa增长到0.3 MPa时,平均雾化锥角从55.02°收缩至27°,水雾粒子的主要速率区间从0~5 m/s增长至0~12 m/s;涡旋处的平均涡量从166.50281 s^-1增长至671.19126 s^-1,且水雾粒子气团的涡旋结构均呈现逆时针转动现象。In order to explore morphological changes of pneumatic water mist flow field under different gas pressures,GLR of pneumatic two-fluid water mist nozzles were measured by using mass flow controllers and PIV technology.Then,features of flow field were analyzed under gas driving pressure between 0.1-0.3 MPa.The results show that under nitrogen pressure of 0.1-0.4 MPa,dimensionless GLR value of water mist nozzles presents a linear growth relationship with nitrogen pressure,and GLR exerts impacts on characteristics of two-phase flow inside the nozzle,liquid breakdown mechanism,droplet dynamics and final droplet size distribution.When gas pressure increases from 0.1 MPa to 0.3 MPa,average atomization cone angle shrinks from 55.02°to 27°,and main velocity range of water mist particles rises from 0-5 m/s to 0-12 m/s.Average vorticity at vortex increases from 166.50281 s^-1 to 671.19126 s^-1,and vortex structure of particle air mass shows counterclockwise rotation.

关 键 词：粒子图像测速(PIV) 气动式细水雾 流场 气液质量流量比(GLR) 雾化锥角 涡量 

分 类 号：X932[环境科学与工程—安全科学]