This paper investigates the modified design of a conventional transonic fan based on a new tandem fan concept with a partial-span rotor, which can significantly enhance the pressurization capacity and flow capacity of the fan's core. The design principles of essential geometric parameters are determined, and the advantages of the new concept are confirmed. The results reveal that the tandem rotor performs better when the pressure surface of the booster rotor is closer to the suction surface of the fan rotor (PP=15%) and its trailing edge is farther from the leading edge of the fan rotor (AO=12%). The introduction of the booster rotor enhances the load near the stator's hub, which can be controlled by modifying the hub profile. Owing to the deficit of the throat area, the blade number of stators must be reduced, but this will lead to an insufficient operation range. After comprehensive consideration, the end-bending angle is fixed at 6°, which can extend the stall margin by 5.5%. In comparison to the baseline fan, the new concept improves the flow capacity by 6.1% and the core's total pressure ratio by approximately 20%. Furthermore, an improvement in the efficiency of more than 5% is obtained at the same specific mass flow compared with the trend line. The time-averaged results of the performance are almost the same as the steady results, and the fluctuation is mainly induced by the interaction between the tip vortex and the stator surfaces.

本文研究了基于带有部分跨度转子的新型串联风扇概念的传统跨音速风扇的改进设计，可以显着提高风扇核心的增压能力和流量。确定了基本几何参数的设计原则，确认了新概念的优点。结果表明，当增压转子的压力面更接近风扇转子的吸力面（PP=15%）且尾缘远离风扇转子的前缘（AO= 12%）。增压转子的引入增强了定子轮毂附近的负载，这可以通过修改轮毂轮廓来控制。由于喉部面积不足，必须减少定子叶片数量，但这将导致操作范围不足。综合考虑，端弯角固定为6°，可延长5.5%的失速裕度。与基准风扇相比，新概念将流量提高了 6.1%，核心总压比提高了约 20%。此外，与趋势线相比，在相同的特定质量流量下，效率提高了 5% 以上。性能的时间平均结果与稳态结果几乎相同，波动主要是由叶尖涡与定子表面的相互作用引起的。新概念使流通能力提高了6.1%，堆芯总压比提高了约20%。此外，与趋势线相比，在相同的特定质量流量下，效率提高了 5% 以上。性能的时间平均结果与稳态结果几乎相同，波动主要是由叶尖涡与定子表面的相互作用引起的。新概念使流通能力提高了6.1%，堆芯总压比提高了约20%。此外，与趋势线相比，在相同的特定质量流量下，效率提高了 5% 以上。性能的时间平均结果与稳态结果几乎相同，波动主要是由叶尖涡与定子表面的相互作用引起的。