受限空间预混钝体稳定与抬升火焰激光诊断  

Laser diagnostics of premixed bluff-body stabilized and lift-off flame in confined space

作　　者：林文隽 毛润泽 张玮杰 张猛[1] 李金玮 王金华[1] 黄佐华[1] LIN Wenjun;MAO Runze;ZHANG Weijie;ZHANG Meng;LI Jinwei;WANG Jinhua;HUANG Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Aero Engine Academy of China,Aero Engine Corporation of China,Beijing 101304,China)

机构地区：[1]西安交通大学能源与动力工程学院动力工程多相流国家重点实验室,西安710049 [2]中国航空发动机集团有限公司中国航空发动机研究院,北京101304

出　　处：《航空动力学报》2021年第7期1443-1451,共9页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅰ-0004-0005);国家自然科学基金(91841302,51776164)。

摘　　要：在受限空间预混钝体燃烧器中,利用OH-PLIF(平面激光诱导荧光)、PIV(粒子图像测速)和瑞利散射测温技术实验研究了火焰结构、流场和温度场之间的相互影响关系。对比分析了贫燃稳定与富燃抬升状态下甲烷/空气预混火焰的燃烧场特性。实验结果表明:火焰结构、流场和温度场分布之间均存在直接联系。贫燃(当量比为0.8)火焰钝体上方为膨胀的高温低速回流区,利于火焰维持稳定;富燃(当量比为1.2)火焰倾向在受限空间出口与外界空气卷吸后着火,其钝体上方为类似冷态的低速低温回流区,无法点燃混合气,因而形成抬升火焰。分析各场局部分布信息获得火焰场间相互依赖规律:钝体火焰中,高温和低速对应已燃区,低温和高速对应未燃区。In a confined premixed bluff-body combustor,OH-PLIF(planar laser-induced fluorescence),PIV(particle image velocimetry)and Rayleigh scattering thermometry technologies were used to experimentally study the relationship among the flame structure,flow field and temperature field.Methane/air premixed flames under fuel lean stable and fuel rich lift-off states were compared and analyzed.Experimental results showed that there was a strong correlation among flame structure,flow field and temperature field.For fuel lean state(equivalence ratio of 0.8),the high temperature and low velocity inner-recirculation zone above the bluff-body helped maintain the stable flame;for fuel rich state(equivalence ratio of 1.2),the flame was prone to ignite after being entrained with the outside air,the low velocity and low temperature inner-recirculation zone similar to cold condition above the bluff-body cannot ignite the rich premixed gas,thus forming a lift-off flame.By analyzing the local distribution of the flame field,the field-to-field interdependency of premixed bluff-body flame was obtained:in bluff body flame,high temperature and low velocity zone corresponded to the burned zone,while low temperature and high velocity zone corresponded to unburned zone.

关 键 词：受限空间 预混钝体火焰 平面激光诱导荧光(PLIF) 粒子图像测速(PIV) 瑞利散射测温 

分 类 号：V231.21[航空宇航科学与技术—航空宇航推进理论与工程] TK16[动力工程及工程热物理—热能工程]