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采用掠形设计技术对一台大涵道比涡扇发动机的风扇转子叶片进行了三维优化.通过三维定常Navier-Stokes(N-S)方程计算,分析了叶片尖部及根部掠形设计参数对风扇转子性能的影响.结果表明,叶片尖部前掠和根部后掠都能增加风扇转子的堵点流量,扩大其稳定工作范围.采用叶片尖部前掠和根部后掠的组合方案优化了叶片.单转子计算结果表明,优化后叶片的堵点流量增加约2%,设计流量点总压比和等熵效率分别增加5%和2%;风扇/增压级整机内外涵联算结果表明,优化后在起飞、巡航和爬升转速下,外涵的稳定工作范围都明显增加,巡航转速下,堵点流量增加约2.3%,失速点流量减小约5.2%,设计流量点的外涵总压比和等熵效率分别增加2%和0.8%,优化后内涵特性没有明显变化.
Three-dimensional optimization of the fan rotor blades of a large bypass ratio turbofan engine is carried out by swept-shape design.The influence of blade tip and root swept design parameters on the fan rotor performance is analyzed by three-dimensional steady Navier-Stokes (NS) equation The results show that both the tip swept and the root swept can increase the flow rate of the fan rotor and enlarge its stable working range.The blades are optimized by the combination of tip swept and root swept.The single rotors The calculated results show that the flow rate of plugging point of the optimized blade increases by about 2%, the total pressure ratio and the isentropic efficiency of the design flow point increase by 5% and 2% respectively. The internal and external calculation results of the fan / supercharger show that after optimization At take-off, cruise and climb speed, the stable working range of external culvert obviously increases. At cruising speed, the flow of plugging point increases about 2.3% and the flow rate of stall point decreases about 5.2%. The total external pressure ratio of design flow point and The isentropic efficiency increased by 2% and 0.8%, respectively, with no significant changes in the connotation characteristics after optimization.