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以某两级风扇为对象开展防颤振设计技术研究。风扇转子叶片设计中,选择了合适的展弦比,既考虑到气动性能水平,还考虑到结构质量和颤振稳定性。采用流固耦合能量法评估所设计风扇的各排转子叶片的颤振稳定性问题,并通过叶片厚度、三维造型、根尖弦长比等设计参数的调整消除颤振风险。研究结果表明:展弦比不应是方案设计阶段防颤设计唯一的关注参数;在叶尖跨声速的转速更容易发生颤振现象;较强的叶尖前缘激波会造成较强的流固耦合作用,形成复杂的气动功分布结构;叶片厚度和尖根弦长比等参数是改善叶片颤振风险的有效参数。
Research on Anti-chatter Design Technology with Some Two-stage Fan. Fan blade design, select the appropriate aspect ratio, taking into account both the level of aerodynamic performance, but also taking into account the structural quality and flutter stability. The flutter stability of each row of rotor blades of the designed fan is evaluated by using the fluid-solid coupling energy method. And the flutter risk is eliminated through the adjustment of the design parameters such as blade thickness, three-dimensional modeling, and chord length ratio. The results show that the aspect ratio should not be the only parameter of concern for the anti-dart design in the design stage. Flutter is more likely to occur at the tip-tachometer speed. Strong tip-leading shocks will result in stronger flow Solid coupling to form a complex structure of aerodynamic work. Parameters such as blade thickness and chord length ratio are effective parameters to improve the flutter risk.