Robustness and mechanical effects of double set tooth connection for large bypass ratio fan rotor
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摘要:
针对大涵道比风扇转子双套齿连接结构，基于有限元法开展连接稳健性评估，分析不同工作载荷下连接结构变形协调性与界面接触状态，关注叶片飞失等极端载荷对连接稳健性影响。考虑双套齿定心面间隙配合特征，建立其对旋转惯性激励载荷影响分析模型，仿真评估定心面间隙对转子系统动力响应影响。结果表明，大涵道比发动机风扇转子转速较低、转子轴直径较小，正常工作载荷下套齿连接结构变形较小，对界面接触特征影响小；叶片飞失带来大横向载荷，可造成风扇转子向一侧偏斜，套齿连接部分产生大接触应力，可达到正常工作载荷的2.5倍；套齿定心面间隙配合可导致悬臂风扇转子惯性主轴倾斜，产生旋转惯性力矩激励，引起转子振动响应增大，支点动载荷大幅增加。
Abstract:Using the finite element method, a robustness assessment was conducted for a double-tooth connection structure in a high bypass ratio fan rotor. The analysis focused on deformation coordination and interface contact states under various working loads, with special attention being paid to extreme conditions like blade loss. The model considered the clearance between double set tooth centering surfaces and assessed its impact on the rotational inertia excitation loads. Results indicated that under normal working loads, the large bypass ratio engine fan experienced minimal impact on interface contact characteristics. However, blade loss induced significant lateral loads, causing rotor tilt and generating substantial contact stress in the sleeve tooth connection, reaching up to 2.5 times normal working load. Furthermore, clearance fit of tooth centering surfaces can lead to tilt in the inertia spindle, generating rotational inertia torque excitation, increasing rotor vibration response, and amplifying dynamic loads on the fulcrum.
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Key words:
- teeth connection /
- gap fit /
- blade loss /
- deformation coordination /
- robustness assessment
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图 1 典型大涵道比风扇转子双套齿结构
Figure 1. Typical double sleeve tooth structure of high bypass ratio fan rotor
图 8 风车状态下风扇盘-轴套齿后定心面接触状态
Figure 8. Contact state of back centering surface of fan disc-shaft sleeve tooth under windmill condition
图 9 风扇盘-轴套齿压紧端面接触状态
Figure 9. Contact state of fan disk-sleeve tooth pressing end face
图 10 风扇盘-轴套齿压紧端面应力分布
Figure 10. Stress distribution on the pressing end face of fan disc-shaft sleeve tooth
图 16 考虑刚度损失时转子共振转速分布
Figure 16. Rotor resonance speed distribution considering stiffness loss
表 1 风扇盘-轴套齿定心面间隙变化
Table 1. Changes in clearance between fan disc and shaft sleeve teeth centering surface
参数 前定心面 后定心面 前端 后端 前端 后端 间隙变化量/mm 0.0245 − 0.0015 − 0.0365 − 0.0365 
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表 2 风扇轴-低压涡轮轴套齿定心面间隙变化
Table 2. Changes in clearance between fan shaft and low-pressure turbine shaft sleeve tooth centering surface
参数 前定心面 后定心面 前端 后端 前端 后端 间隙变化量/mm − 0.0242 − 0.0241 − 0.0283 − 0.0283
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表 3 风扇轴-低压涡轮轴套齿界面接触应力变化
Table 3. Contact stress change of fan shaft-low pressure turbine shaft sleeve tooth interface
位置 接触应力
参数/MPa工况 变化率/% 工作 风车 压紧端面 峰值 154.49 281.92 82.48 均值 38.758 42.172 8.81 套齿接触面 峰值 168.89 143.74 −14.89 均值 25.29 20.675 −18.25
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