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MECHANICAL DESIGN OF A VARIABLE PITCH FAN FOR TURBOFAN ENGINES

机译：涡轮风扇发动机变桨风扇的机械设计

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摘要

The mechanical design of a new variable pitch fan system for high bypass turbofan engines is presented, offering 10-14% fuel savings for next generation turbofan engines. Comparable in weight to current fans, the new design incorporates a compact pitch change mechanism that fits within a current fan's center body. The key to compactness is the use of multiple high strength tension/torsion straps, which support blade centrifugal loads with unique structural efficiency and redundancy, while allowing ten to fifteen degrees of blade pitch rotation. The new retention system also offers significant reduction of pitch control forces by balancing blade centrifugal twisting loads with strap restoring moments, achieving a desired pitch setting. The use of a pin root fan blade facilitates on-wing blade replacement. Fan blade incidence angles are decreased at low aircraft speeds to avoid fan stall flutter problems. Therefore, advanced engines no longer need the addition of a variable area nozzle to the exit of the fan duct to prevent flutter, saving additional weight, complexity, and cost. This new fan system offers the best solution for achieving a major improvement in turbofan engine efficiency, at the lowest weight.
机译：提出了用于高旁路涡发发动机的新型可变音频风扇系统的机械设计，为下一代涡扇发动机提供10-14％的燃料节省。对当前风扇的重量相当，新设计包括紧凑的俯仰变化机制，适合当前风扇的中心体内。紧凑性的关键是使用多个高强度张力/扭转带，其支持叶片离心载荷具有独特的结构效率和冗余，同时允许十到十五度的叶片间距旋转。新的保留系统还通过平衡刀片离心扭曲载荷的带有带恢复矩，实现所需的间距设置来显着降低俯仰控制力。使用销根风扇叶片促进翼叶刀片更换。风扇叶片入射角在低飞机速度下降低，以避免风扇停滞颤动问题。因此，高级发动机不再需要将可变区域喷嘴添加到风扇管道的出口中以防止颤动，节省额外的重量，复杂性和成本。这款新型风扇系统提供了最佳解决方案，以实现最低重量的涡扇发动机效率的重大改进。

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