喷射油滴沉积油膜的流动铺展特性研究  

Study on Flow Characteristics of Deposited Oil Film Formed by Sprayed Oil Droplets

作　　者：方龙[1] 陈国定[1] 刘登[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械工程学报》2016年第23期160-167,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51275411)

摘　　要：航空齿轮和航空发动机主轴轴承都采用喷油润滑的方式进行润滑,喷射油滴与机械零件表面碰撞后形成的沉积油膜的流动特性影响着机械零件的润滑状态和功能。由于有关喷射油滴与固体表面碰撞形成沉积油膜及其流动铺展特性研究较为鲜见,已有的相关研究集中于液滴/固体壁面正碰撞条件下的非油类液膜流动分析,故而对机械零件相关润滑分析计算支持极为有限。采用VOF方法建立了喷射油滴/固体壁面斜碰撞及其沉积油膜流动铺展数值分析模型,通过试验研究对数值分析模型进行了修正,进而基于此数值分析模型分析了航空传动零件润滑等效条件下喷射油滴/固体壁面斜碰撞沉积油膜流动铺展特性,通过与国外相关试验结果的对比验证了所提出的数值分析模型的正确性和实用性。所开展的喷射油滴沉积油膜的流动铺展特性研究,为航空机械零部件润滑计算提供了技术方法和基础数据,对于实现航空机械零部件精确润滑设计有明显的工程意义。Spray lubrication is applied to aeronautic gear and aero-engine principal axis bearing chamber. The sprayed oil droplets impacte onto the surface of mechanical parts and then forme the deposited oil film. The flow characteristics of the deposited oil film have a great influence on the lubricating state of mechanical parts. However, the research of oil droplets impacting onto the solid wall and flowing on it is rarely to see and the previous studies are focused on the non-oil liquid under the condition of normal impact. As a result, the existing research provided limited support for the relevant lubricating analysis of the mechanical parts. A sprayed oil droplet/wall oblique impact and deposited oil film flow characteristics numerical analysis model by VOF method and amended the numerical analysis model by experiment is established. The deposited oil film flow characteristics under the real aviation lubrication conditions by the numerical model is analyzed and the numerical results with foreign experimental results in the same conditions to verify the correctness and practical value of the numerical analysis model is compared. The study on flow characteristics of deposited oil film provided technical method and basic date for the aviation lubrication calculation and that would have remarkable engineering significance for the accurate lubrication design of the aviation mechanical parts.

关 键 词：航空齿轮 轴承腔 喷射油滴 斜碰撞 数值模型 沉积油膜 铺展特性 

分 类 号：V233[航空宇航科学与技术—航空宇航推进理论与工程]