旋流对氢气微混扩散燃烧特性的影响  

Influence of Swirl on Combustion Characteristics of Hydrogen Micro-mixing Diffusion Flame

作　　者：史挺 刘怡 贾世琦 葛冰[1] 段冬霞 臧树升 SHI Ting;LIU Yi;JIA Shiqi;GE Bing;DUAN Dongxia;ZANG Shusheng(Key Laboratory of Power Machinery and Engineering,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;China United Gas Turbine Technology Co.,Ltd.,Beijing 100016,China)

机构地区：[1]上海交通大学动力机械及工程教育部重点实验室,上海200240 [2]中国联合重型燃气轮机技术有限公司,北京100016

出　　处：《动力工程学报》2024年第9期1401-1407,共7页Journal of Chinese Society of Power Engineering

摘　　要：在当量比0.3~0.5的条件下,针对旋流数为0.62与无旋流2种微混扩散燃烧器开展了试验研究,考察了旋流作用对微混扩散燃烧流场、火焰结构、NO_(x)排放以及燃烧不稳定性的影响。实验运用OH*化学发光法与粒子图像测速(PIV)技术捕获了火焰与流动结构。结果表明:加入旋流能够通过改变流场结构,使火焰高度降低44%,进而缩短停留时间,最终实现NO_(x)排放体积分数减少63.4%;无旋流微混扩散火焰脉动的主要驱动因素是高当量比下火焰径向膨胀区的生成,而旋流的加入可以抑制径向膨胀区的生成,从而在宽负荷范围内实现抑制燃烧振荡的效果。Experimental studies were conducted on two types of micro-mixing diffusion combustors,one with a swirl number of 0.62 and another one without swirl,under the equivalence ratio from 0.3 to 0.5.The influences of swirl on the flow field distribution,flame structure,NO_(x)concentration,and combustion instability of micro-mixing diffusion combustion were investigated experimentally.The methods of OH*chemiluminescence and particle image velocimetry(PIV)were used to capture flames and flow structures.Results show that adding swirl can reduce the flame height by 44%and shorten the residence time by changing the flow field structure,ultimately achieving a 63.4%reduction in NO_(x)emissions.Without swirl,the main driving factor of micro-mixed diffusion flame pulsation is the formation of radial expansion zone under high equivalent ratios,while swirling flow can inhibit the formation of radial expansion zone,so as to achieve the effect of suppressing combustion oscillation in a wide load range.

关 键 词：微混扩散燃烧 旋流 火焰结构 燃烧振荡 NO_(x)排放 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]