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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.
In order to study the effect of Venturi tube structure on the flow field characteristics of a combustion chamber, a three-dimensional numerical simulation of a single-stage axial hydrocyclone / venturi structure was carried out. The results show that with the expansion of venturi tube, The radial expansion strength is enhanced and the diameter of the recirculation zone is increased. The change of venturi expansion angle and shrinkage ratio will cause double vortex, triple vortex and quadrupole vortex in the recirculation zone of the flame tube. The vortices arranged in front and rear respectively correspond to the main vortex And the secondary vortex. The three-vortex and the four-vortex structure have great potential in ignition and combustion of the combustion chamber. The length of the central reflux zone and the reflux velocity increase with the increase of the venturi contraction ratio. The three vortex Compared with the four-vortex structure, the double-vortex structure is more stable, making the combustion chamber load adjustment range greater, contributing to the improvement of the combustion chamber performance.