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针对环形富油燃烧-焠熄-贫油燃烧(Rich burnQuench-Lean burn)燃烧室内的焠熄掺混,利用激光PIV(粒子图像速度仪)对几种冷态工况下的流场进行激光可视化分析研究,考察了射流主流通量比和主流雷诺数变化对燃烧室头部流场及下游旋流的影响规律。实验中喷嘴出口主流和焠熄射流均使用25℃空气,同时维持燃烧室内压力恒定。研究表明:当维持主流雷诺数不变时,增加焠熄射流动量通量比,回流区尺寸发生变化,长度减小宽度增加,同时回流区形状逐渐从锥形向柱形发展;焠熄射流会影响下游流场的旋流,维持主流雷诺数不变的情况下,随着动量通量比的增加,焠熄射流孔下游的旋流逐渐被破坏;而维持动量通量比的情况下,主流雷诺数对回流区形状尺寸和焠熄孔下游旋流无明显影响。
For the quench blending in a ring-rich combustion-quench-lean burn combustion chamber, the laser PIV (particle image velocity meter) was used to laser visualize the flow field in several cold conditions The influence of main flow ratio and main Reynolds number on the head flow field and downstream swirl in the combustion chamber was investigated. In the experiment, the nozzle outlet mainstream and quench jet use 25 ℃ air, while maintaining a constant pressure in the combustion chamber. The results show that when the main Reynolds number is kept constant, the momentum flux ratio of quenching jet increases, the size of the recirculation zone changes and the length of the recirculation zone decreases. At the same time, the shape of the recirculation zone gradually develops from cone to column. Which will affect the swirling flow in the downstream flow field and keep the mainstream Reynolds number unchanged, the swirling flow downstream of the quenching jet hole will be gradually destroyed with the increase of the momentum flux ratio; while maintaining the momentum flux ratio, The main Reynolds number has no obvious influence on the shape and size of the recirculation zone and the swirling downstream of the quenching hole.