宽弦风扇叶片造型对碰摩振动的影响规律

陈大玮; 肖贾光毅; 陈勇

doi:10.13224/j.cnki.jasp.20210054

宽弦风扇叶片造型对碰摩振动的影响规律

doi: 10.13224/j.cnki.jasp.20210054

1.
上海交通大学机械与动力工程学院，上海 200240
2.
上海交通大学燃气轮机与民用航空发动机教育部工程研究中心，上海 200240

详细信息

作者简介:
陈大玮（1996-），男，硕士生，主要从事航空发动机叶片碰摩、叶盘振动等研究。

通讯作者:
陈勇（1975-），男，讲师，博士，主要从事航空发动机结构、强度、振动、寿命、复合材料风扇叶片设计、分析及验证，航空发动机结冰过程的断裂力学问题的研究。E-mail：yongchen@sjtu.edu.cn

中图分类号: V231.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-04
- 刊出日期: 2021-12-28

Influence law of blade profiling of wide-chord fan on rub-induced vibration

1.
School of Mechanical Engineering，Shanghai Jiao Tong University，Shanghai 200240，China
2.
Engineering Research Center of Gas Turbine and Civil Aero Engine，Ministry of Education，Shanghai Jiao Tong University，Shanghai 200240，China

摘要

摘要: 基于造型叠加建立了参数化的宽弦风扇叶片模型，利用碰摩动力学研究了叶片造型对于机匣碰摩振动的影响规律。宽弦风扇叶片的复杂几何造型可能会增大碰摩的非线性程度，因此有必要研究叶片几何外型对于碰摩响应的影响。在圆柱坐标系下建立了叶片造型和几何参数间的关系，得到了风扇叶片的参数化模型。利用三次样条拟合简化了叶顶间隙的计算，研究了偏心碰摩工况下基准叶片的振动问题，分析了振动响应、涂层磨损、叶片应力三者间的关联性。基于涂层磨损程度判断不同造型叶片的碰摩特性，实现了针对碰摩-造型相关性的快速分析。计算结果表明：叶根通流角可以显著影响叶身长度，进而改变了叶片固有频率调整碰摩共振的中心频率；叶顶扭转角通过改变最小抗弯刚度方向，可有效减小碰摩共振转速区间；相较于前倾叶片，后倾叶片有着更好的碰摩稳定性。
- 宽弦风扇叶片 /
- 叶片造型 /
- 碰摩振动 /
- 参数化建模 /
- 相关性分析
Abstract: Based on the superposition principle of geometric features，a parameterized wide-chord fan blade model was established，and the influence of blade profiling on rub-induced vibration was also studied by rub-impact dynamics.The complex geometric shape of wide-chord fan blades may enhance the rubbing nonlinearity，so it is necessary to study the influence of blade geometry on the rub-induced vibration.The relationship between the blade profiling and geometric parameters was established in the cylindrical coordinate system，and the parameterized model of the fan blade was obtained.With the calculation of blade tip clearance simplified by cubic spline fitting，the correlation between the vibration response，coating wear and blade stress of the basic blade was investigated under eccentric rubbing conditions.The blade rubbing characteristics of different geometric features were analyzed by the degree of wear of abradable coating，realizing the rapid analysis of rubbing vibration and blade profiling.The calculation results showed that the inner flow path angle had a significant influence on the blade length and natural frequency，which adjusted the center resonance frequency；by changing the direction of minimum bending stiffness，the tip twist angle effectively reduced the rubbing resonance interval；compared with the forward-lean blade，the backward-lean blade had better rubbing stability.
- wide-chord fan blade /
- blade profiling /
- rub-induced vibration /
- parametric modeling /
- correlation analysis

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