SUN Heng-chao, CHEN Guo-ding, YOU Hao, CHEN Jun-yu. Effect of Sealing Air on Oil Droplet and Oil Film Motions in Bearing Chamber[J]. International Journal of Plant Engineering and Management, 2013, 18(3): 130-139

Effect of Sealing Air on Oil Droplet and Oil Film Motions in Bearing Chamber
SUN Heng-chao, CHEN Guo-ding, YOU Hao, CHEN Jun-yu
School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072, P. R. China
Bearing chamber is one of important components that support aero-engine rotors and research on oil droplet and oil film motions is an important part of bearing chamber lubrication and heat transfer design. Considering the pressure of sealing air is an important operating condition that affects the oil droplet and oil film motions,the effect of sealing air pressure on airflow in bearing chamber is investigated in this paper firstly; and then based on the air velocity and air / wall shear force,the oil droplet moving in core air,deposition of oil droplet impact on wall as well as velocity and thickness of oil film are analyzed secondly; the effect of sealing air pressure on oil droplet velocity and trajectory,deposition mass and momentum,as well as oil film velocity and thickness is discussed. The work presented in this paper is conducive to expose the oil / air two phase lubrication mechanism and has certain reference value to guide design of secondary air / oil system.
Key words:    aero-engine    bearing chamber    sealing air    two phase flow    droplet    oil film    calculation    drag coefficient    film thickness    model    trajectory    velocity   
Received: 2013-08-04     Revised:
Funds: This paper is supported by the Natural Science Foundation of China under Grant No.51275411
Corresponding author:     Email:
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