摘要
为了研究文氏管结构对燃烧室流场特性的影响,对单级轴向旋流器/文氏管结构进行了三维数值模拟.结果表明:随着文氏管扩张角度的增大,回流区径向扩张强度增强,回流区直径增大;文氏管扩张角度和收缩比的变化会使火焰筒回流区内出现双涡、三涡和四涡结构,前后排列的涡旋分别相当于主涡和次涡,这种三涡和四涡结构在燃烧室的点火燃烧方面具有较大发展潜力;中央回流区长度和回流速度会随着文氏管收缩比的增大而逐渐增大;三涡和四涡结构相比双涡结构更稳定,使燃烧室负荷调节范围更大,有助于燃烧室性能的提高.
To investigate the effects of venturi tube structure on flow field characteristics of the combustion chamber,three-dimensional numerical simulation was carried out to a single stage axial swirler/venturi tube.Results show that as the divergence angle increases,both the radial expansion intensity and diameter of recirculation zone increase;when the venturi tube's divergence angle and contraction ratio change,double-,triple-and quadruple-vortex will occur in the recirculation zone,and the vortexes distributed in tandem are equivalent to the main and secondary vortex,bringing benefits to the ignition and combustion of the combustion chamber;the length and back-flow velocity of central recirculation zone increase with the rise of venturi tube's contraction ratio;the structure of triple-and quadruple-vortex is more stable than that of double-vortex,which helps to extend the range of available load,and therefore improve the performance of the combustion chamber.
出处
《动力工程学报》
CAS
CSCD
北大核心
2015年第6期463-468,共6页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(11372276
11432013)
关键词
文氏管
回流区
涡旋
数值模拟
venturi tube
recirculation zone
vortex
numerical simulation
