Abstract
In the process of studying the steady-state performance and component matching of adaptive cycle engines with convertible fan system, it was found that the front fan and aft fan stage have a unique matching problem when the mode select valve is closed and engine is operating at higher Mach number conditions. The cause of this matching problem was studied with numeric simulation in this paper. Based on the features of adaptive cycle engines with convertible fan system, the possible methods and their feasibilities of solving this matching problem were also discussed. According to the results, the flow rate adjustment capacity of the aft fan stage directly determines the occurrence and severity of this matching problem. The matching problem can be ameliorated in some extent by either reducing the design second bypass ratio or adjusting the variable geometry mechanisms, but it cannot be completely solved at the aspect of component matching mechanism.
Highlights
This paper mainly discusses a (“front stall & rear blockage” (FSRB) matching problem founded in the steady-state performance research of A Matching ProblemAdaptive cycle engines (ACEs) with convertible fan system (CFS)
After analyzing the causes of FSRB problem, the feasibility of solving this problem is discussed from three aspects: the influence of component characteristics, the chosen of design cycle parameters and the adjustment of variable geometry mechanism
Fan and aft fan stage (AFS) are both connected to the low-pressure shaft and the matching problem cannot be ameliorated by slip adjustment, the FSRB problem will inevitably occur
Summary
Adaptive cycle engines (ACEs) are an advanced aero gas turbine engine, which is being considered as the power plant of future military fighters [1]. According to the general R&D experience of aero gas turbine engine, study on the working principles and component matching features are the basic parts in the development process of a specific configuration, and has important guiding significance for the feasibility demonstration, the configuration selection and the following R&D [18,23,24,25,26]. In the process of studying the steady-state performance of ACE with CFS, a matching problem between the front fan and aft fan stage (AFS) was found This problem occurs at the condition of high altitude and high speed flight when the engine works in the small bypass ratio mode and it will seriously affect the aerodynamic stability of the compressing components.
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