多级旋流空气雾化喷嘴高空气动雾化场的数值研究  

Numerical investigation of high altitude aerodynamic and spray fields for multi-swirl airblast atomizer

作　　者：赵乾鹏 杨金虎[1,2,3] 刘存喜 刘富强[1,2,3] 穆勇 胡春艳[1,2,3] 徐纲 ZHAO Qianpeng;YANG Jinhu;LIU Cunxi;LIU Fuqiang;MU Yong;HU Chunyan;XU Gang(Laboratory of Light‑Duty Gas‑Turbine,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of Aeronautics and Astronautics,University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Light‑duty Gas Turbine,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院工程热物理研究所轻型动力重点实验室,北京100190 [2]中国科学院大学航空宇航学院,北京100049 [3]中国科学院轻型动力创新研究院,北京100190

出　　处：《航空动力学报》2021年第12期2555-2567,共13页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅲ-0007-0032)。

摘　　要：为有效拓宽采用预膜式空气雾化喷嘴的多旋流分级燃烧室的稳定工作边界,在模型燃烧室上开展了高原及高空工况下气动雾化场的数值研究,采用经过实验验证的数值模拟方法获取了多旋流分级燃烧室的高空气动场和雾化场,分析了低温、低压进口条件对燃烧室流场结构和雾化质量的影响。结果表明:低温及低压进口工况对中心回流区的结构及尺度、速度分布影响较小,但低温会削弱旋流器出口湍动能强度,低压会显著降低旋流空气切向剪切力。相同旋流器压降下,低温、低压条件会造成气液比和韦伯数的降低,导致雾化粒径增大,液滴群轴向穿透深度增加。相关研究结论能够解释该类燃烧室高空点火困难的影响机制。In order to effectively widen the stable operating limits of multi-swirl staged combustor with prefilming airblast atomizer,the aerodynamic and spray fields of a model combustor under plateau and high-altitude conditions were studied numerically.A numerical method verified by experiments was used to acquire the high-altitude aerodynamic and spray fields of a multi-swirl staged combustor.The influences of low temperature and sub-atmospheric pressure conditions on the flow field structure and atomization quality were analyzed.The results showed that the low temperature and sub-atmospheric pressure conditions had little influence on the flow structure,scale and velocity distributions of central recirculation zone.However,the low temperature weakened the turbulent intensity in swirler outlet,and the sub-atmospheric pressure significantly reduced the tangential shear force of swirling air.Under the same pressure drop of injector,the low temperature and sub-atmospheric pressure conditions led to the decrease of air-liquid ratio and Weber number,which further led to the increase of droplet size and the axial penetration depth of droplet group.The findings from this investigation can explain the influence mechanism of altitude relight difficulty for this kind of combustor.

关 键 词：空气雾化喷嘴 多旋流分级 低温 低压 气动场 雾化场 

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]