为了满足多种工作模式性能需求，变循环发动机通常具有多条共同工作线，使得核心机驱动风扇级（CDFS）由常规压气机面向“线”的设计转变为面向“面”的设计。基于CDFS试验效率随进口可调导叶（VIGV）角度调节的变化规律，为兼顾不同工作模式性能，提出了CDFS降流量、压比设计方法。该方法降低了转子、静子的气动负荷，提升了反力度。数值仿真表明，CDFS降流量3.2%、压比5.0%设计使单外涵模式效率、喘振裕度依次降低0.5%和2.2%，双外涵模式效率、喘振裕度提升1.4%和4.7%，双外涵模式的性能收益高于单外涵模式的性能损失。级性能对比表明，降流量、压比设计的性能收益源自VIGV、静子总压恢复系数的提升。基于发动机在不同工作模式下的性能需求优先级，以及CDFS工作点可由前涵道引射器调整的优势，降流量、压比设计是可行的，具有很高的应用潜力。

Variable cycle engines generally have multiple working lines to achieve the performance requirement of multiple working modes， transforming the Core-Driven Fan Stage （CDFS） from the conventional compressor line-oriented design to face-oriented design. Based on CDFS experimental efficiency with the angle adjustment of Variable Inlet Guide Vanes （VIGV）， a mass flow-reduction and pressure ratio-reduction design method is proposed to balance different working modes performance. The method lowers the rotor and stator aerodynamic load， and raises the reaction. Numerical simulation of a CDFS with reduced design mass flow of 3.2% and design pressure ratio of 5.0% showed that the efficiency and surge margin decreased by 0.5% and 2.2% respectively in the single bypass mode， and increased by 1.4% and 4.7% respectively in the double bypass mode. The performance profits of the double bypass mode exceeded the losses of the single bypass mode. Comparison of stage characteristics revealed that the performance profits of the mass flow-reduction and pressure ratio-reduction method originated from the improvement in the VIGV and stator total pressure recovery coefficient. Based on the priority of engine performance requirements in different working modes， and the advantage of adjustable CDFS work point through the forward variable area bypass injector， the mass flow and pressure ratio-reduction design method is feasible with high application potential.