双级轴向旋流非预混燃烧和流动特性分析
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摘要
对双级轴向旋流非预混燃烧器进行了研究,应用计算流体动力学(CFD)数值模拟,探索一级旋流器叶片安装和文氏管扩张角的角度变化对燃烧特性、温度场及流动场的影响规律。研究结果表明:在文氏管扩张角依次增大的过程中,燃烧室内中心回流区中心前移,旋转射流径向扩张角增大;CH4的浓度沿径向分布更加均匀,降低了燃烧室内的最高温度。此外,在5种文氏管扩张角和一级旋流器叶片安装角的结构条件下,燃烧室中外回流区域的温度均低于内回流区域温度。当一级旋流器叶片安装角度为55°、二级旋流器叶片安装角度为35°时,燃烧器出现回火现象。
The two-stage axial swirl non-premixed burner is studied. The computational fluid dynamics(CFD)numerical simulation is applied to explore the influence law of the change of first-stage swirler blade installation angle and venturi expansion angle on the combustion characteristics, temperature field and flow field. The results show that the center of the recirculation zone in the combustion chamber moves forward, and the radial expansion angle of the rotating jet increases with the increase of the expansion angle. The concentration of methane is more evenly distributed along the radial direction which reduces the maximum temperature in the combustion chamber. In addition, it is also found that the temperature in outer recirculation zones of the combustion chamber is lower than that of the inner recirculation zone under five structural conditions of different venturi expansion angle and first-stage swirler blade installation angle. When the first-stage swirler blade installation angle is 55° and the second-stage swirler blade installation angle is 35°, a flashback phenomenon appears in the burner.
The two-stage axial swirl non-premixed burner is studied. The computational fluid dynamics(CFD)numerical simulation is applied to explore the influence law of the change of first-stage swirler blade installation angle and venturi expansion angle on the combustion characteristics, temperature field and flow field. The results show that the center of the recirculation zone in the combustion chamber moves forward, and the radial expansion angle of the rotating jet increases with the increase of the expansion angle. The concentration of methane is more evenly distributed along the radial direction which reduces the maximum temperature in the combustion chamber. In addition, it is also found that the temperature in outer recirculation zones of the combustion chamber is lower than that of the inner recirculation zone under five structural conditions of different venturi expansion angle and first-stage swirler blade installation angle. When the first-stage swirler blade installation angle is 55° and the second-stage swirler blade installation angle is 35°, a flashback phenomenon appears in the burner.
引文
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[2]张永生,穆克进,张哲巅,等.不同空气和燃料旋流强度下合成气稀释扩散火焰特性研究[J].中国电机工程学报,2009,29(2):63-68.
[3]赵伶玲,周强泰.旋流燃烧器的稳燃及其结构优化分析[J].动力工程,2006(1):74-80.
[4]曾卓雄,薛锋,张龙.双旋流驻涡燃烧室湍流燃烧流动的数值分析[J].推进技术,2017,38(7):1572-1578.
[5]刘泽宇,张弛,韩啸,等.分层比对分开分层旋流预混火焰结构的影响[J].航空学报,2018,39:121692.
[6]LIU X,ELBAZ A M,GONG C,et al.Effect of Burner Geometry on Swirl Stabilized Methane/air Flames:A Joint LES/OH-PLIF/PIV Study[J].Fuel,2017,207:533-546.
[7]刘爱虢,朱悦,陈保东,等.某重型燃气轮机NOx排放性能反应动力学数值计算[J].上海交通大学学报,2017,51(11):1383-1390.
[8]张济民,韩超,张宏达,等.钝体绕流有旋流中回流区与进动涡核的大涡模拟[J].推进技术,2014,35(8):1070-1079.
[9]TONG Y H,LIU X,WANG Z K,et al.Experimental and Numerical Study on Bluff-body and Swirl Stabilized Diffusion Flames[J].Fuel,2018,217:352-364.
[10]BENIM A C,IQBAL S,MEIER W,et al.Numerical Investigation of Turbulent Swirling Flames with Validation in a Gas Turbine Model Combustor[J].Applied Thermal Engineering,2017,110:202-212
[11]付忠广,王瑞欣,石黎,等.旋流器通道宽度对旋流预混燃烧特性影响数值模拟[J].热力发电,2018,47(2):63-70,77.