旋流叶片安装角对低排放燃烧室性能影响的数值研究
Numerical Study on the Influence of Swirl Blade Installation Angle on the Performance of a Low Emission Combustor
冯忠民 1孙继昊 1宋颖 1赵宁波1
作者信息
- 1. 哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨 150001
- 折叠
摘要
为研究旋流器预混级结构对燃烧室性能的影响规律,以环管型模型燃烧室为研究对象,采用数值仿真的方法,分析了第二级预混级叶片安装角对燃烧室冷态流场流动和掺混特性以及燃烧特性的影响.结果表明:第二级叶片安装角对回流区尺寸、燃料/空气掺混特性和燃烧特性有明显影响;随着第二级叶片安装角度增加,旋流强度增加,回流区径向宽度增加,总压损失增加,旋流器出口和火焰筒内燃料分布更均匀,燃烧场温度降低,NOx生成量降低,CO生成量极低且对第二级叶片安装角变化不敏感.在研究范围内,第二级叶片安装角为50°时燃烧室性能最好,燃烧场总压损失为3.17％,燃烧效率为99.99％,NOx生成量为4.26 × 10-6.
Abstract
To investigate the influence of the premixer stage structure of the swirler on the performance of the combustor,a numerical simulation method was applied to analyze the effects of the blade installation angle of the second premixer stage on the cold flow field,mixing characteristics and combustion perform-ance of a can annular model combustor.The results show that second-stage blade installation angle has a significant influence on the size of the recirculation zone,the fuel/air mixing characteristics and the com-bustion performance.As the second-stage blade installation angle increases,the swirling intensity in-creases,the radial width of the recirculation zone widens,and the total pressure loss increases.The fuel distribution at the swirler outlet and in the combustor liner becomes more uniform,resulting in a lower reac-ting field temperature,lower NOx production,and extremely low CO production that is insensitive to chan-ges in the second-stage blade installation angle.Within the scope of the study,the combustor performs op-timally when the installation angle of the second-stage blade is set at 50°,with a total pressure loss in the reacting field of 3.17％,a combustion efficiency of 99.99％,and a NOx production of 4.26 × 10-6.
关键词
同轴分级/模型燃烧室/贫燃预混燃烧/天然气/污染物排放Key words
coaxial staged/model combustor/lean premixed combustion/natural gas/pollutant emis-sions引用本文复制引用
出版年
2024
NETL
NSTL
万方数据