H_(2)/CH_(4)燃料轴向分级燃烧再燃火焰流动与燃烧特性的试验研究  

Experimental Study on Reignition Flame Flow and Combustion Characteristics of H_(2)/CH_(4)Fuel Axial Staging Combustion

作　　者：李原森 李昱泽 肖运来 葛冰[1] LI Yuansen;LI Yuze;XIAO Yunlai;GE Bing(Key Laboratory of Power Machinery and Engineering,Ministry of Education,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院动力机械及工程教育部重点试验室,上海200240

出　　处：《动力工程学报》2024年第9期1385-1392,共8页Journal of Chinese Society of Power Engineering

摘　　要：燃料轴向分级(AFS)燃烧技术是目前重型燃气轮机的先进低污染燃烧技术。为了揭示H_(2)/CH_(4)燃料种类和射流角对轴向分级燃烧的再燃区流场、火焰结构的影响规律,使用高频粒子图像测速(PIV)技术和OH^(*)基自发光技术,探究射流当量比为0.6、动量通量比为6时90°和45°射流角对不同种类的燃料轴向分级流场、再燃火焰结构的影响。研究表明:当射流角为90°时,射流根部会产生明显的回流区;射流火焰存在周期性脉动;当射流角为45°时,剪切层在射流根部不会产生明显的回流区,射流火焰燃烧更加稳定,燃料在低速区的化学停留时间更短,对于火焰传播速度快、容易回火的氢气燃料有较好的适应性;甲烷燃料掺氢增加了射流火焰的传播速度,随着掺氢比的增加,射流火焰从脱体火焰逐渐变为连续火焰,迎风侧射流火焰分支出现,反应区长度缩短并且变小,火焰强度增强,火焰根部向喷嘴出口移动并最终附着在射流喷嘴出口。Axial fuel staging(AFS)combustion technology is an advanced low pollution combustion technology for heavy gas engines at present.In order to reveal the effects of H_(2)/CH_(4)fuel species and jet angle on the re-combustion zone flow field and flame structure of axial staged combustion,high-frequency particle image velocimetry(PIV)and OH^(*)-based self luminescence techniques were used.The effects of 90°and 45°jet angles on the axial staged flow field and the flame structure of different fuels were investigated when the jet equivalence ratio was 0.6 and the momentum flux ratio was 6.Results show that when the jet angle is 90°,there will be an obvious recirculating zone at the root of the jet,and the jet flames have periodic pulsations.When the jet angle is 45°,the shear layer will not produce a significant recirculating zone at the root of the jet,the jet flame burn is more stable,and the chemical residence time of the fuel in the low-speed zone is shorter,which has better adaptability for hydrogen fuel with fast flame propagation speed and easy tempering.The doping of methane fuel with hydrogen increases the propagation speed of the jet flame.With the increase of hydrogen doping ratio,the jet flame gradually changes from a detached flame to a continuous flame,the jet flame branch appears on the windward side,the length of the reaction zone is shortened and smaller,the flame intensity is enhanced,and the flame root moves to the nozzle outlet and finally attaches to the jet nozzle outlet.

关 键 词：燃料轴向分级 射流角 二级火焰结构 掺氢燃烧 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]