变循环压缩系统的一体化通流设计方法

Integrated throughflow design method of variable-cycle compression system

以双外涵和三外涵两款典型的涡扇发动机的变循环压缩系统为研究对象发展了一个基于流线曲率法的一体化通流设计方法,以期简化变循环压缩系统的设计流程,缩短设计周期.通过一个三外涵变循环压缩系统的设计实例,验证了方法的正确性和程序的功能完整性,得到了以下主要结论:1第1,2外涵道的连通使压缩系统各部件之间的气动关系变得复杂,正确处理各部件之间的匹配关系是一体化设计的关键;2流线曲率法适用于变循环压缩系统的通流设计,其流量边界条件可方便地用于模拟前可调面积涵道引射器的调节功能;3第1,2外涵道的掺混过程对上游叶片区域的流场影响微弱,采用简单的掺混模型能够满足计算需求.

Targeting the two typical variable-cycle compressor system of turbofan engines,double-bypass engine and triple-bypass engine,an integrated throughflow design method based on streamline curvature method was proposed for simplifying the design process of a variable-cycle compression system and shortening the design cycle.By solving the flow filed of a triple-bypass variable-cycle compression system,the feasibility of the method and the capability of the code was proven.Three main conclusions were drawn：（1）The connection of the first and second bypasses complicates the aerodynamic correlations of the components and correctly reflecting the correlations is the key of an integrated design method.（2）Streamline curvature method is suitable for variable-cycle compression system design and its mass flow boundary conditions can be used for modeling the function of thefront area-variable bypass injector.（3）The mixing process of the first and second bypasses flow will not influence the upstream blade flow field,and simple mixing model can meet the requirements for simulation of such a process.