不同淬熄结构下RQL燃烧室流场特性的数值研究

采用雷诺平均Navier-Stokes(RANS)方法对不同淬熄结构的富油/淬熄/贫油(RQL)燃烧室内定常掺混流动过程进行了数值模拟,分析了不同截面的流场结构,研究了动量通量比及淬熄孔排布方式的影响。结果表明:射流进入RQL燃烧室后发生偏转且偏转方向和旋流方向有关,回流区长度、穿透深度和高湍动能区随着动量通量比的增大而增加;当J≥80时,淬熄射流下游出现高湍动能区,逐渐与上游融为一体;当J≥120时,回流区的长度基本不再发生明显变化。此外,非中心对冲结构C3具有更大的高湍动能区,掺混更均匀。 

Numerical study on flow field characteristics of RQL combustor under different quenching structures

The Reynolds averaged Navier-Stokes (RANS) method was used to simulate the steady flow process in rich-burn/quench/lean-burn（RQL）combustors of different quenching structures. The flow field structure of different cross sections was analyzed to study the effects of momentum flux ratio and quenching hole arrangement. Results showed that the jet deflected after entering the RQL combustor and the deflection direction was related to the swirling direction. The recirculation zone length, jet depth and high kinetic energy zone increased with the increase of the momentum flux ratio. When J≥80, a high kinetic energy zone appeared downstream the quenching jet, and gradually merged with the upstream. When J≥120, the length of the recirculation zone was substantially no longer changed. In addition, the non-central opposed jet structure C3 had a larger turbulent kinetic energy zone with better mixing.