ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Characteristics analysis of oil droplet deposition and oil film flow in a bearing chamber
Received date: 2015-09-30
Revised date: 2015-10-20
Online published: 2015-11-26
Supported by
National Natural Science Foundation of China (51275411)
The lubrication and heat transfer designs of an aero engine bearing chamber depend on the understanding about the states of oil/air two-phase flow and heat transfer in chamber. To overcome the weakness of previous study, we investigates into the characteristics of oil droplet deposition and oil film flow in a bearing chamber considering the heat transfer of oil droplet/housing interaction, deposition heat and oil film temperature, namely, the effect of temperature. Firstly, the deposition characteristics of a single oil droplet are analyzed, and the deposition mass, momentum and heat are obtained. Secondly, with the oil droplet size distribution, the deposition oil film mass, momentum and heat of all the droplets impacting on housing are obtained by dispersing the diameter range of the droplets. Finally, with the above parameters, the oil film temperature, average velocity and thickness are calculated by means of force balance and mass conservation conditions. The results show that with an increasing shaft speed, the oil droplet deposition rates of mass, momentum and heat decrease, and the first deposition oil film mass, deposition oil film momentum, deposition oil film heat and oil film velocity increase, while oil film thickness decreases. The comparison of oil film thickness between theoretical data and experimental data shows that the proposed theoretical model is reliable and the consideration of temperature effect improves the calculation accuracy about oil film thickness. The present work provides some references for the design of bearing chamber.
Key words： aero engine; bearing chamber; droplets; deposition; oil film; heat transfer; temperature
WANG Li'na , CHEN Guoding , SUN Hengchao . Characteristics analysis of oil droplet deposition and oil film flow in a bearing chamber[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(10) : 3159 -3169 . DOI: 10.7527/S1000-6893.2015.0302
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