节流盘对超紧凑燃烧室性能影响的数值研究

Numerical Investigation on Influence of Throttle Plate on Performance of Ultra Compact Combustor

为进一步理解节流盘对主次流轴向进气超紧凑燃烧室性能的影响,基于Cot t le超紧凑燃烧室原型结构,采用计算流体力学的方法探究了燃烧环内旋流涡流燃烧的组织原理以及节流盘对旋流涡流燃烧特性及出口温度特性的影响。结果表明:节流盘可提高燃烧环内混气的离心加速度,加快火焰传播速度;节流效应导致的低压区可增大高温燃气径向迁移速度,增强高温燃气与核心流的掺混,改善燃烧室出口温度分布特性;燃烧环内存在涡流燃烧,节流盘可扩展燃烧涡的尺寸,提高火焰稳定性。

In order to get a better understanding of the throttle plate＇s influence on the performance of ultra compact combustor with axial inlet of primary and secondary flows,based on the prototype structure of Cottle ultra compact combustor,the mechanism of vortex and swirl combustion organization in the combustion ring and the plate＇s in fluend on the performance of vortex and swirl combustion as well as on the outlet temperature were investigated by using Computational Fluid Dynamics.The results show that the throttle plate can increase the centrifugal acceleration of fuel-air mixture in the combustion ring,and accelerate the flame transmission.Then,the low pressure area caused by throttle effect increases the radial velocity of the high temperature gas and enhances its mixing with the core flow,improves the combustor outlet temperature distribution.Moreover,there is swirl combustion in the combustion ring,the throttle plate can enlarge the size of vortex and improve the stability of flame.