CAO Yi-tao 1,2 ，ZHONG Yi-cheng 3 ，WU You 1 ，ZHOU Lin 1 ，SU Zhi-min 1.Influence of Sealing Air Mass Flow Rate on Bearing Chamber Outer Wall Oil Movement[J].航空发动机,2023,49(1):127-133
Influence of Sealing Air Mass Flow Rate on Bearing Chamber Outer Wall Oil Movement
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Key Words:bearing chamber  sealed airflow  movement of oil droplets  oil film thickness  oil distribution  temperature distribution  aeroengine
Author NameAffiliationE-mail
CAO Yi-tao 1,2 ，ZHONG Yi-cheng 3 ，WU You 1 ，ZHOU Lin 1 ，SU Zhi-min 1 1.AECC Hunan Aviation Powerplant Research Institute, Zhuzhou Hunan 412002, China；2. School of Power and Energy, Northwest? ern Polytechnical University, Xi’an 710129, China；3.College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China yt_tsao@163.com 
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Abstract:In order to study the influence of seal gas mass flow rate on the oil distribution and temperature distribution on the outer wall of bearing chamber, based on the Lagrangian Discrete Phase Model （DPM）and the liquid film model, the unsteady numerical simula? tion of the movement of oil droplets in bearing chamber, the transformation of oil droplets to oil film and the movement of the oil film in bearing chamber were carried out using STAR CCM+ commercial software, and the results were compared with the test results of the thick? ness of oil film in bearing chamber at Karlsruhe University in Germany. The results show that the calculated values are in good agreement with the test values at high rotational speed, and the average relative error is 13.6%. At low rotational speed, due to poor air distribution uni? formity, there is a certain error between calculated values and test values at individual operating points, but the minimum relative error is 4%, which is generally consistent. With the increase of the mass flow rate of the seal gas in the bearing chamber, the average flow velocity of the air in the bearing chamber increases, and the ability to shear and disturb the oil film on the outer wall of the bearing chamber increas? es, resulting in the decrease of the thickness and stability of the oil film on the outer wall of the bearing chamber. The temperature distribu? tion on the outer wall of the bearing chamber is consistent with the thickness distribution of the oil film, and the minimum temperature is lo? cated at the position where the oil drops impact the wall. With the increase of the mass flow rate of the seal gas in the bearing chamber, the low temperature region on the outer wall of the bearing chamber increases, but the uniformity of temperature distribution becomes worse.
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