Analysis of aerodynamic design characteristics of core driven fan stage

The flow field and aerodynamic design characteristics of core driven fan stage(CDFS) were simulated and analyzed with modified Denton code. The results show that: 1)adjustable inlet guide vane (IGV) is needed to achieve the switch of different working modes; 2) the conflict between high tip speed and low aerodynamic loading restrains the efficiency of CDFS; 3) IGV outlet swirl distribution and switch mode have remarkable effects on CDFS performance; 4) the challenge in the aerodynamic design of CDFS rotor is the shock loss in single bypass mode; 5) the change in distribution and magnitude of CDFS stator inlet flow angle is the main challenge in CDFS stator design.