变循环发动机后涵道引射器的研究现状与关键技术

变循环发动机是航空发动机的发展方向。相较于传统的航空发动机，变循环航空发动机在加力燃烧室中设置了后涵道 引射器这一典型可调几何机构，以满足整机对气动匹配、推力和燃油经济性的需求。讨论了变循环发动机后涵道引射器的发展历 程、布置位置、结构形式等，分析了后涵道引射器的结构特征和功能特点，点明了对加力燃烧室气动热力性能、结构尺寸的影响和 对发动机推力、耗油率的影响。同时，结合后涵道引射器的发展历程和技术特征，指出了其在性能、结构和控制等方面需要深入研 究的快速响应、精准控制和高可靠性等关键技术。通过对后涵道引射器的讨论和分析，以期为变循环发动机乃至未来涡轮基组合 循环发动机的后涵道引射器性能和结构设计提供参考。

Investigation Status and Key Technologies of Rear Variable Area Bypass Injector of Variable Cycle Engine

Variable cycle engine (VCE) is the development direction of the aeroengine. Compared with traditional aeroengines, the afterburner of VCE is equipped with a typical variable-geometry mechanism, the rear variable area bypass injector (RVABI), to meet the whole engine requirements of the aerodynamic matching, thrust, and fuel consumption. The development history, arrangements, and structural forms of RVABI in VCE are discussed, the structural and functional characteristics are analyzed, and the influence on the aerothermal performance and the size of the afterburner, engine thrust, and specific fuel consumption are elucidated. According to the development history and technical characteristics of RVABI, key technologies such as quick response, precise control, and high reliability that need further study in terms of performance, structure, and control are pointed out. The discussions and analyses aim to provide refer? ences for RVABI performance and structure design of variable cycle engines and the future turbine-based combined cycle engines.