分级旋流燃烧室流动及碳烟排放特性研究  

Flow field and soot emission characteristics of staged swirling combustor

作　　者：胡阁 李建中[1] 张靖周[1] 金武 HU Ge;LI Jianzhong;ZHANG Jingzhou;JIN Wu(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2024年第6期168-177,共10页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅲ-0002-0026,2019-Ⅲ-0014-0058)。

摘　　要：为了探究某分级旋流燃烧室流动及碳烟排放特性,结合试验和数值仿真方法对流动特性进行研究,揭示了主、副模分级旋流燃烧室的流动发展过程。通过大涡模拟(LES)非定常流动计算,结果表明:副模出口附近速度存在着1820 Hz的周期性振荡,而主模出口流动未见明显脉动,同时钝体下游存在进动涡核(PVC)结构;对分级旋流燃烧室碳烟排放的数值研究,结果表明:中心回流区附近是碳烟主要生成区域,在贫油燃烧时,随着油气比增大,碳烟浓度显著增大,碳烟浓度随沿程轴向距离增加均呈现先上升后减小趋势,且其峰值对应轴向位置逐渐后移,最终导致燃烧室出口冒烟排放的差异。In order to investigate the flow field and soot emission characteristics of staged combustor,the flow field characteristics were studied by experimental and numerical simulation methods,and the flow development process was revealed.The results of large eddy simulation(LES)showed that there was a 1820 Hz periodic velocity oscillation at the outlet of the pilot stage,but without obvious flow pulsation at the outlet of the main mode,and there was a precession vortex core(PVC)downstream the swirler.Numerical studies of soot emission characteristics showed that soot was abundant in primary recirculation zone.The soot concentration increased significantly with the increase of ratio of fuel and air in the lean combustion state.Along axial direction,the concentration of soot all showed a trend of decrease after rising first,and the peak corresponding to the axial position gradually moved back,ultimately resulting in a difference in soot emission from the combustor exit.

关 键 词：燃烧室 分级旋流 流场 非定常 碳烟 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]