摘要
气体轴承中的多余颗粒物是导致陀螺电机不起动的主要原因。研究颗粒物的吸入、运动沉降以及排出规律,对解决陀螺电机不启动问题具有重要意义。以螺旋槽气体动压止推轴承为研究对象,将气体流场作为连续相,颗粒物作为离散相,通过联立求解气体N-S方程和颗粒物力平衡方程,得到了亚微米级颗粒物在轴承中的运动与沉积规律。分析发现气膜中速度场分布与颗粒物沉积之间的相关性,且与实验结果有较好的一致性;同时,发现槽数为12或13、螺旋角为α=20°左右时颗粒物最容易从轴承中排除,增加槽深和较小槽长也有相同效果。为在生产实践中优化陀螺电机轴承结构参数,降低不启动率提供了理论依据。
The main reason for the start-up failure of aerodynamic gyro motor is considered to be the contamination of bearing surface.Understanding the mechanism of inhalation,deposition and ejection of the contamination in the bearing gas film is important to solve the problem of start-up failure for the gyro motors. Taking the spirally grooved aerodynamic thrust bearings as the research object,and taking the gas flow field as the continuous phase as well as taking submicron particles as the discrete phase,the movement and deposition of the contaminant particles in bearings are obtained by solving the gas N-S equation and the particle force equilibrium equation simultaneously.The results reveal the correlation between the air motion and particle deposition,and are in good agreement with the experimental results.Furthermore,when the groove number is 12 or 13,and the groove angel is 20°,the particles can easily move out the bearing.The deposition quantity of particles decreases with groove depth,and increases with groove length.These conclusions are very helpful in optimizing the structural parameters of gyro motor bearings and reducing the rate of starting failure in the production.
作者
冯明
侯冲
忽敏学
刘志宏
FENG Ming;HOU Chong;HU Minxue;LIU Zhihong(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Tianjin Institute of Navigation Instruments,Tianjin 300131,China)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2019年第2期227-234,240,共9页
Journal of Chinese Inertial Technology
基金
工信部工业强基工程资助项目(TC160A310/2)
关键词
气体动压轴承
陀螺电机
多余物
不起动
气固两相流
air bearing
gyro motor
sub-micron particles
start-up failure
gas-solid two-phase flow
作者简介
冯明(1963—),男,教授,博士生导师,从事滑动轴承技术研究。E-mail:mingfeng@me.ustb.edu.cn.
