喷嘴旋向对多喷嘴预混燃烧的影响  

Effect of Swirling Direction on Premixed Multi-Nozzle Combustion

作　　者：柳伟杰[1] 葛冰[1] 田寅申[1] 臧述升[1] 翁史烈[1] Liu Weijie Ge Bing Tian Yinshen Zang Shusheng Weng Shilie(School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chin)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《燃烧科学与技术》2016年第4期289-295,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51206109)

摘　　要：针对五喷嘴模型燃烧室采用层流小火焰模型进行数值模拟,讨论了中心喷嘴同向旋流和反向旋流对甲烷/空气多喷嘴预混燃烧的影响,模拟结果与实验结果吻合较好.数值模拟结果表明,多喷嘴预混火焰悬浮于喷嘴上方0.3,d处,多喷嘴气流相互掺混形成了高度湍流的掺混区,在掺混区内发生强烈的燃烧化学反应.中心喷嘴同向旋流布置时,主回流区顺时针扭曲,流动最后发展为与单喷嘴类似的旋流流场结构;对于中心喷嘴反向布置,气流整体旋流偏转较小,掺混后喷嘴气流仍然保持着各自的旋流流动结构.此外,中心喷嘴的同向/反向布置对多喷嘴预混燃烧反应进程的影响不大.Numerical simulation was conducted in a five-nozzle model combustor using a laminar flamelet combus-tion model.The effect of co-swirling and the counter-swirling of the center flow on the flow structure and combustion reaction progress in CH4/air premixed flame is discussed.Numerical results are in good agreement with experimental data.Results show that the multi-nozzle flames are 0.3,d above the nozzle exit plane.The neighboring swirling flows interact with each other,generating a highly turbulent mixing zone where intensive reactions take place.For the co-swirling flow of center nozzle,the main recirculation zones are distorted in the clockwise direction and the flow de-velops into a unified swirling similar to single swirling flow.For center nozzle counter-rotation arrangement,the flow deflection is small and keeps the individual swirling structure after flow merging.The arrangement direction of center nozzle,however,has little effect on the combustion progress in the premixed multi-nozzle flame.

关 键 词：预混火焰 多喷嘴燃烧 旋流方向 反应进程变量 小火焰模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]