PIV对射流煤粉火焰流场特性的分析  

Analysis on Flow Field of Coal Jet Flame Using PIV

作　　者：王振南[1] 张扬[1] 吴玉新[1] 许开龙[1] 张海[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2015年第6期1356-1359,共4页Journal of Engineering Thermophysics

基　　金：国家自然基金项目(No.51006062)

摘　　要：为研究湍流煤粉射流进入高温环境后的流动及混合特性,采用PIV测量平流射流煤粉燃烧器中心射流区域的流场特性。通过对不同示踪粒子特性的分析,选定SiC表征气相流场,选定煤粉表征煤粉射流流场。实验结果表明;煤粉具有较好的散射特性,因而采用PIV可获得合理的煤粉颗粒流场;相同射流速度下,冷态射流比热态有更强的湍流脉动特征,主要原因是热态条件下气流黏度增加2~3倍,显著降低射流Re。In order to investigate the flow and the mixing characteristics of the coal turbulent jet in the high-temperature surroundings,it is necessary to measure the flow field of Hencken Burner using PIV system.SiC particles were used to be as trace particles which could show the distribution of gas flow field,while the coal particles showed the coal jet flow field.It is indicated from the results that the transition point of the Re is about 1760;coal particles possess good scattering properties;the cold jet flow has stronger turbulent fluctuation compared with the hot jet flow under the same jet speed,which can be caused by the increasing viscosity when temperature increases.

关 键 词：湍流射流 Hencken BURNER PIV 示踪粒子 

分 类 号：TM621[电气工程—电力系统及自动化]