In order to reduce the fan rotor aerodynamic performance degradation caused by the increasing of blade surface roughness, optimal design of high bypass ratio fan rotor blade with surface roughness was carried out to improve the aerodynamic performance of the fan rotor in long-term flight operation. With the condition of surface roughness uniformly distributed on the blade, the fan blade was optimized by using sweep and lean technology, and the aerodynamic characteristics of the fan blade with different surface roughness were numerically investigated. Numerical results show that the overall aerodynamic performance of the fan rotor decreases as the equivalent sand roughness k_s of the blade increasing from 3 μm to 150 μm. The isentropic efficiency of the original blade decreases by 1.56% when the surface roughness reaches 150 μm. Composite sweep and lean optimization was carried out when k_s = 80 μm, the isentropic efficiency of the optimized blade at design point is increased by 0.28%, the second optimization based on the optimized blade above by using the reverse lean technology further improved the fan isentropic efficiency by 0.12%, the degradation caused by surface roughness was reduced by optimization, and the robust design of fan rotor blade was achieved.

为了减少由于叶片表面粗糙度增大而导致的风扇转子气动性能下降，对具有表面粗糙度的高涵道比风扇转子叶片进行优化设计，以提高风扇转子在长期飞行运行中的气动性能。在叶片表面粗糙度均匀分布的条件下，采用扫掠和精益技术对风扇叶片进行优化，并对不同表面粗糙度的风扇叶片气动特性进行数值研究。数值结果表明，风扇转子的整体气动性能随着等效沙子粗糙度k _s而降低叶片从 3 μm 增加到 150 μm。当表面粗糙度达到150 μm时，原叶片的等熵效率降低了1.56%。在k _s = 80 μm时进行复合扫掠和倾斜优化，优化后的叶片在设计点的等熵效率提高了0.28%，在上述优化叶片的基础上进行二次优化，采用反向倾斜技术进一步改进了风机等熵效率降低0.12%，通过优化降低了表面粗糙度引起的退化，实现了风机转子叶片的稳健设计。