Reserch on Aerodynamic Features of Core Driven Fan Stage and Stator Scheme
As core driven fan stage(CDFS)is one of the key components to realize the width and bypass ratio regulation of variable cycle engine,its outlet flow angle varies greatly under different working modes,making it difficult to match CDFS with downstream components.To solve this problem,a row of small Angle stator is designed to add behind the CDFS rotor to optimize the matching effect between CDFS and downstream components.The calculation results show that the addition of stator scheme behind the rotor will reduce the efficiency of CDFS,but can improve the stability margin of CDFS.The stability margin of the small angle stator scheme under the double bypass mode is 4.4 per cent higher than that of the scheme without stator scheme,and the pressure ratio and efficiency are higher than the conventional stator scheme:a CDFS stator scheme with better performance.
core driven fan stagevariable cycle enginestability marginoptimized matching
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