中心分级贫油直喷燃烧室冷态流场特性

为了研究中心分级贫油直喷燃烧室冷态流场特性及头部结构参数对中心回流区的影响，采用数值模拟方法对不同结构 参数下的冷态流场开展对比研究，并对基准方案进行了试验验证。结果表明：副模收敛角度以及喷嘴轴向位置对回流区影响较 小，副模旋流叶片角度以及主副模头部径向间距对回流区影响较大。随着副模旋流叶片角度增大，副模出口旋流加强，引起出口 气流张角增大，使得中心回流区体积扩大；随着主副模头部径向间距增加，削弱了主副模出口气流在切向方向上的相互影响，主模 出口气流得以充分发展，中心回流区体积扩大。

Study on the Characteristics of Non-reaction Flow Field of Concentric Staged Lean Direct Injection Combustor

In order to study the characteristics of the non-reaction flow field of concentric staged lean direct injection combustor and the influence of dome structural parameters on the central recirculation zone, a contrastive study was carried out on the non-reaction flow field under different dome structural parameters by numerical simulation and the test verification of the baseline configuration was complet? ed. The results show that the convergent angles of the pilot module and the axial position of the nozzle have little influence on the central re? circulation zone, the swirl angles of the pilot module and the radial spacing between the main module and the pilot module have significant influence on the central recirculation zone. With the increase of swirl angles, swirl strength is enhanced and the angle of flow expands at the outlet of the pilot module, causing the size of the recirculation zone significantly increased, With the increase of radial spacing, the interac? tion between the main module and the pilot module is weakened at tangential direction and the outlet flow of the main module is fully devel? oped, causing the size of recirculation zone significantly increased.