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 the front 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.