一种新型的预测射流扩散火焰长度、直径和体积的方法  

A New Method for Predicting the Length,Width and Volume of the Jet Diffusion Flame

作　　者：亢银虎[1,2] 卢啸风[3] 黄小美[1,2] 彭世尼[1,2] 阳东[1,2] Kang Yinhu;Lu Xiaofeng;Huang Xiaomei;Peng Shini;Yang Dong(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China;School of Urban Construction and Environmental Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学城市建设与环境工程学院,重庆400045 [3]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《燃烧科学与技术》2017年第2期185-191,共7页Journal of Combustion Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(106112015CDJRC211103)

摘　　要：对二甲醚、天然气、LPG射流扩散火焰的长度、直径及体积特性进行试验和理论研究,并探究了喷嘴内径d_f对火焰流动状态的影响.结果表明,随d_f的增加,火焰过渡区及吹熄极限对应的射流雷诺数Ref逐渐增加,而相应的射流速度u_f逐渐降低.对每种燃料,其层流无量纲火焰长度与Re_f呈正比,湍流无量纲火焰长度为定值;在层流和湍流状态下,火焰直径恒定,但在过渡区,火焰直径快速增加.据此,本文提出一种新型、预测精度更高的射流扩散火焰几何尺寸的关联式,并拟合出二甲醚、天然气、LPG火焰的无量纲长度、直径及体积的经验关联式.In this paper,the length,width,and volume behavior of DME,natural gas and LPG jet diffusionflames were experimentally and theoretically studied.A series of fuel nozzles with different internal diameters dfwere involved presently to investigate its effect on the flame behavior.The results show that with the increase ofdf,the transitional and bow-out Ref increase,and the corresponding uf decreases gradually.For each fuel,thelaminar dimensionless flame length is proportional to Ref,while the turbulent one remains unchanged.Besides,the dimensionless flame width remains unchanged at laminar and turbulent regimes,but it increases quickly at thetransitional stage.Accordingly,new forms of correlation with higher prediction accuracy were developed to correlatethe dimensionless length,width and volume of DME,natural gas and LPG jet diffusion flames with Ref.

关 键 词：射流扩散火焰 几何尺寸 射流雷诺数 流动状态 解析解 

分 类 号：TK16[动力工程及工程热物理—热能工程]