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方龙,陈国定.航空发动机热区轴承腔壁面油膜流动及温度特性[J].航空动力学报,2020,(4):682~692
航空发动机热区轴承腔壁面油膜流动及温度特性
Flow and temperature characteristics of wall film in bearing chamber located in hot region of aero-engine
投稿时间:2019-10-15  
DOI:10.13224/j.cnki.jasp.2020.04.002
中文关键词:  热区轴承腔  壁面油膜  油膜厚度  油膜速度  油膜温度
英文关键词:bearing chamber in hot region  wall film  film thickness  film velocity  film temperature
基金项目:国家自然科学基金(51275411)
作者单位
方龙 School of Mechanical Engineering,,Northwestern Polytechnical University,Xi'an 710072,China 
陈国定 School of Mechanical Engineering,,Northwestern Polytechnical University,Xi'an 710072,China 
摘要点击次数: 94
全文下载次数: 218
中文摘要:
      将热区轴承腔壁面油膜划分为若干上下游相互关联的流动控制单元,结合壁面油膜流动状态以及油滴的运动状态进行单位时间内各壁面油膜控制单元中的油滴/油膜碰撞转移分析,基于此构建壁面油膜控制单元的非定常质量、动量和能量方程,并利用Matlab自编软件求解获得轴承腔壁面油膜厚度分布、流动速度分布和温度分布特性,最终形成轴承腔壁面油膜流动及温度特性分析的方法。结果表明:在所研究的工况范围内,轴承腔壁面油膜厚度分布在0~1 mm内,油膜速度分布在0~5 m/s范围内,壁面油膜温度分布在100~140 ℃范围内;轴承腔左右两侧的壁面油膜厚度、速度和温度都随着周向角度的增加而不断增加,且在相同工况下轴承腔壁面油膜的最高温度比最低温度增加了约为13%;随转子转速的增加,轴承腔壁面油膜的速度及温度是增加的,而壁面油膜的厚度是减小的;随着进油量的增加,轴承腔壁面油膜厚度和速度是增加的,而油膜温度略有下降。开展的航空发动机热区轴承腔壁面油膜流动及换热特性研究工作,为轴承腔润滑系统的精确设计提供了理论支持和基础数据。
英文摘要:
      The wall film in bearing chamber is divided into flow control units which are related to each other. Based on the motion state of droplet and wall film, the mass, momentum and heat transfer were analyzed in each flow control unit. And then the unsteady mass, momentum and heat equations of each flow control unit were established and solved by house coding with help of Matlab. A theoretical method to analyze flow and heat transfer characteristics of wall film in bearing chamber was established. Results showed that the film thickness was within the range of 0-1 mm, the film velocity was within range of 0-5 m/s, and the film temperature was within the range of 100-140 ℃. At the same condition, the highest film temperature increased by 13% compared with the lowest film temperature. The film velocity and temperature increased with the rotor speed, while the film thickness decreased with the rotor speed. The film thickness and velocity increased with inlet flow rate, while the film temperature decreased with inlet flow rate. The research work is not only a theoretical foundation but also a data support for improvements of the efficiency of aero engines.
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