| 引用本文: | 王莉娜,陈国定,苏华,杨光美,张延超.考虑装配条件的C/C复合材料指尖密封动态性能Symbol`@@[J].哈尔滨工业大学学报,2016,48(7):135.DOI:10.11918/j.issn.0367-6234.2016.07.022 |
| WANG Lina,CHEN Guoding,SU Hua,YANG Guangmei,ZHANG Yanchao.Dynamic performance of C/C composite finger seal considering assembly condition[J].Journal of Harbin Institute of Technology,2016,48(7):135.DOI:10.11918/j.issn.0367-6234.2016.07.022 |
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| 摘要: |
| 针对航空发动机装配条件影响指尖密封性能的问题，构建考虑装配条件的C/C复合材料指尖密封动态性能分析方法. 根据指尖密封与转子间的力学行为构建多层叠置指尖密封的分布质量等效动力学模型；确定模型中等效质量、等效结构刚度系数、接触刚度系数、摩擦阻力以及转子激励等参数；借助等效动力学模型计算泄漏率和指尖梁/转子接触压力等指尖密封的动态性能. 计算结果表明：依间隙配合、无间隙配合和过盈配合条件的顺序，指尖梁位移响应和指尖梁与转子之间的泄漏间隙均会随之降低，但其接触压力会随之增大，体现出指尖密封泄漏和磨损的“矛盾”性. 在确定的装配条件下，可以通过结构设计改变指尖梁的结构刚度，以使指尖密封泄漏和磨损性能均达到最优.
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| 关键词: 指尖密封 航空发动机 等效动力学模型 C/C复合材料 装配条件 |
| DOI：10.11918/j.issn.0367-6234.2016.07.022 |
| 分类号:TH122 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51575445；51305343)； 陕西省自然科学基金(2014JM7266) |
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| Dynamic performance of C/C composite finger seal considering assembly condition |
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WANG Lina1, CHEN Guoding1, SU Hua1, YANG Guangmei1, ZHANG Yanchao2
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(1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China; 2. School of Mechanical Instrumental Engineering, Xi’an University of Technology, Xi’an 710048, China)
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| Abstract: |
| To investigate into the influence of aeroengine assembly condition on the performance of finger seal, an analysis method about the dynamic performance of C/C composite finger seal considering assembly condition is proposed. Firstly, a distributed mass equivalent dynamic model of finger seal with a stack of finger elements is built according to the mechanical behavior between the finger seal and rotor. Secondly, the equivalent parameters are determined, such as equivalent mass, equivalent structural stiffness coefficient, contact stiffness coefficient, frictional force and rotor displacement excitation. Lastly, the dynamic performance of C/C composite finger seal is calculated by the dynamic model, including the leakage rate and the finger stick/rotor contact pressure. It is shown that, in the accordance with clearance fit, no clearance fit and interference fit, the leakage gap of finger stick and the rotor would be decreased, while the contact pressure would be increased. It is reflected that the leakage and wear are two contradictory performance indexes of finger seal. Therefore the structural stiffness of finger stick is changed by structure design under the certain assembly condition. That makes the leakage and wear to be all optimal.
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| Key words: finger seal aeroengine equivalent dynamic model C/C composite assembly condition |
