密封气流流量对轴承腔外壁滑油运动的影响  

Influence of Sealing Air Mass Flow Rate on Bearing Chamber Outer Wall Oil Movement

作　　者：曹逸韬 钟易成[3] 吴悠 周琳 苏志敏 CAO Yi-tao;ZHONG Yi-cheng;WU You;ZHOU Lin;SU Zhi-min(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou Hunan 412002,China;School of Power and Energy,Northwest-ern Polytechnical University,Xi’a n 710129,China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002 [2]西北工业大学动力与能源学院,西安710129 [3]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空发动机》2023年第1期127-133,共7页Aeroengine

基　　金：航空动力基础研究项目资助。

摘　　要：为了研究密封气流质量流量对轴承腔外壁面上滑油分布及温度分布的影响,基于拉格朗日离散相模型(DPM)和液膜模型,利用STAR CCM+商业软件对轴承腔内油滴运动、油滴向油膜的转化以及油膜在轴承腔内的运动开展非稳态数值模拟计算,并与德国Karlsruhe大学轴承腔油膜厚度试验结果进行对比。结果表明:计算值与试验值在高转速下一致性较好,平均相对误差13.6%;低转速下由于空气分布均匀性较差,个别工况点计算值与试验值存在一定误差,但最小相对误差在4%,总体上具有较好一致性;随着轴承腔密封气流的质量流量的增加,轴承腔内空气的平均流动速度提高,对轴承腔外壁面上油膜的剪切作用和扰动能力增强,导致轴承腔的外壁面油膜厚度和稳定性降低;轴承腔外壁面上的温度分布与油膜的厚度分布一致,最小温度分布在壁面上被油滴冲击位置;随着轴承腔密封气流的质量流量的增加,轴承腔外壁面上低温分布范围增大,但温度分布均匀性变差。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 simulation 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 thickness 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 uniformity,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 increases,resulting in the decrease of the thickness and stability of the oil film on the outer wall of the bearing chamber.The temperature distribution on the outer wall of the bearing chamber is consistent with the thickness distribution of the oil film,and the minimum temperature is located 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.

关 键 词：轴承腔 密封气流 油滴运动 油膜厚度 滑油分布 温度分布 航空发动机 

分 类 号：V228.2[航空宇航科学与技术—飞行器设计]