丁坤英,裴祥忠,刘子剑,王梦潇,贾治豪.基于赫兹接触模型的发动机封严涂层碰磨力计算与优化[J].表面技术,2024,53(5):184-193.
DING Kunying,PEI Xiangzhong,LIU Zijian,WANG Mengxiao,JIA Zhihao.Calculation and Optimization of Impact and Wear Forces of Engine Sealing Coatings Based on Hertz Contact Model[J].Surface Technology,2024,53(5):184-193 |
| 基于赫兹接触模型的发动机封严涂层碰磨力计算与优化 |
| Calculation and Optimization of Impact and Wear Forces of Engine Sealing Coatings Based on Hertz Contact Model |
| 投稿时间：2023-05-25 修订日期：2023-11-15 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.05.019 |
| 中文关键词: 封严涂层 大气等离子喷涂 高速碰磨 赫兹模型 摩擦升温 优化系数 |
| 英文关键词:sealing coating atmospheric plasma spraying high speed impact and wear hertz model friction heating optimization coefficient |
| 基金项目:中央高校基本科研业务经费项目(3122019189) |
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| Author | Institution |
| DING Kunying | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
| PEI Xiangzhong | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
| LIU Zijian | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
| WANG Mengxiao | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
| JIA Zhihao | Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
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| 中文摘要: |
| 目的 提高航空发动机的推进效率，在压气机机匣上喷涂可以减少叶尖径向间隙的封严涂层。叶尖与涂层之间的碰磨力会导致涂层脱落，且会击伤叶片，需要对碰磨力进行分析。方法 采用大气等离子喷涂技术制备4种不同硬度的AlSi-PHB(聚苯酯)封严涂层，通过表面硬度测试、弹性模量测试和高速碰磨试验，分别评价封严涂层的硬度、弹性模量，以及在高速碰磨过程中不同工况下涂层受到的碰磨力;基于赫兹接触模型对叶尖与涂层之间的碰磨力进行计算，通过激光共聚焦显微镜和扫描电子显微镜对碰磨后的涂层和叶尖进行分析，同时根据接触面形态特征和温度特征对赫兹模型进行优化。结果 碰磨力与涂层的硬度、叶尖转速、叶尖切入速率有关，复杂的接触表面形貌和摩擦升温会导致理论计算值与实验值之间出现偏差。结论 通过优化叶尖和涂层的接触系数，同时考虑摩擦升温对涂层弹性模量的影响，可将不同工况下碰磨力计算值与测量值之间的偏差控制在1%~11%，这项研究对于指导航空发动机封严涂层的设计具有重要意义。 |
| 英文摘要: |
| The aircraft engine sealant coating can effectively improve the air tightness of the aircraft engine and improve the fuel utilization efficiency. However, due to the existence of friction between the blades and the coating, the coating often peels off and causes damage to the blades, resulting in economic losses. Therefore, it is necessary to analyze the friction between the blade and the coating. In this paper, four kinds of aluminum-silicon polyphenylene ester sealed coatings with different polyphenylene ester contents were prepared by atmospheric plasma spraying (APS). The hardness and elastic modulus of the coatings were obtained by a hardness test and an elastic modulus test, and the cross-sectional microstructures of the four coatings were observed with a scanning electron microscopy (SEM). It was found that the hardness of the coatings was related to the non-metallic phase content of the coatings. More pores, cracks and polyphenylene ester content resulted in smaller coating hardness, and the elastic modulus of the coatings increased with the increase of coating hardness. A high-speed bruising test machine was used to analyze the bruising force between the blade and the coating, and four bruising conditions were designed to conduct high-speed bruising tests on four coatings and the maximum normal bruising force during the bruising process was recorded; the maximum normal contact load on the coating during the bruising process was calculated based on the Hertzian contact model. The test values of the high speed contact test were compared with the theoretical calculated values, and it was found that the calculated values of the Hertzian contact model were always larger than the test values. In order to make the Hertzian contact model more accurate for the calculation of the contact force between the blade and the coating, the coefficients of the contact coefficient in the Hertzian contact model were optimized. The coefficients Δ β of the Hertzian contact model were optimized according to the adhesion of the blade tip and the average line roughness of the coating surface after the grinding test by means of a laser confocal microscope and a scanning electron microscope. The elasticity coefficients E in the Hertzian model were optimized by the effect of temperature change on the elastic modulus of the coating material during the bruising process. The optimized coefficients were substituted into the Hertzian contact model to recalculate the maximum normal contact load on the coating during the high speed bruising process, and the results of the optimized Hertzian contact model, the results of the Hertzian contact model before the optimized coefficients and the high speed bruising test values were compared. The results show that the actual contact between the blade and different coatings and the thermal aggregation effect caused by high blade speed are the main reasons for the deviation between the calculated results before the optimized factor and the test values. The Hertzian model after the optimization factor is closer to the experimental test value than the Hertzian model before the optimization factor, and the deviation from the test value is within 1%-11%. The reason for the deviation may be related to the coupling effect between the tangential force and the normal force. |
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