航空学报2025，Vol.46Issue(22)：16-29,14.DOI:10.7527/S1000-6893.2025.31943
基于波瓣可变面积混合器的燃油分布特性
Fuel distribution characteristics of variable area injector with lobe structure
摘要
Abstract
The flow rate of the extra-cylinder of the variable-cycle engine will change greatly with the transition of the working mode,and the corresponding internal/external contour blending flow brings challenges to the fuel injection scheme of the afterburner.In order to solve this problem,this paper numerically simulates the fuel distribution charac-teristics of afterburner in variable cycle engine under different modes,explores the influence of wide-range airflow change on fuel distribution,and forms a fuel injection optimization strategy for multi-modal afterburner.The results show that the velocity component of the afterburner mixture along the radial direction and the flow vortex induced by the lobe mixer are the key factors affecting the radial/circumferential diffusion of the fuel,respectively.In the small by-pass ratio mode,the connotation-dominated high-temperature and high-speed flow makes the fuel diffusion velocity relatively consistent in a wide range.However,the radial velocity and vortex distribution of the gas change significantly in the large bypass ratio mode,resulting in obvious differences in the fuel diffusion velocity in different regions,which affects the uniformity of fuel distribution.On this basis,an optimization strategy is proposed to moderately increase the fuel flow rate of the nozzle at the middle position,and the results show that the uniformity of fuel distribution will be in-creased by up to 33.04%.关键词
燃油掺混/雾化过程/多股流气体混合/加力燃烧室/变循环发动机Key words
fuel blending/spatial atomization formation/mixing of multiple streams of gas/afterburner/variable cycle engine分类
航空航天引用本文复制引用
柏育松,李臻曜,冯子懿,黄玥,尤延铖..基于波瓣可变面积混合器的燃油分布特性[J].航空学报,2025,46(22):16-29,14.基金项目
国家科技重大专项(J2019-Ⅲ-0016-0060) （J2019-Ⅲ-0016-0060）
国家自然科学基金(12302369) National Science and Technology Major Project(J2019-Ⅲ-0016-0060) （12302369）
National Natural Science Foundation of China(12302369) （12302369）
