轴承腔油气两相介质流动与热分析  

Flow and thermal analysis of oil air two-phase medium in bearing chamber

作　　者：李炎军 杨富 刘振侠[1] 张朝阳 吕亚国[1] LI Yanjun;YANG Fu;LIU Zhenxia;ZHANG Chaoyang;LV Yaguo(School of Power and Energy,Northwestern Polytechnical University,Xi'an 710129,China;Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Chengdu 610500,China)

机构地区：[1]西北工业大学动力与能源学院,西安710129 [2]中国航空发动机集团有限公司四川燃气涡轮研究院,成都610500

出　　处：《航空动力学报》2021年第3期606-615,共10页Journal of Aerospace Power

摘　　要：为获得轴承腔油气两相介质流动与热分析计算方法,探究轴承腔油气两相介质流动换热规律。以某发动机轴承腔结构为对象,运用CFD方法分析轴承腔中两相介质流动速度、温度分布、体积分数和传热系数分布。基于试验获取轴承腔内外不同位置局部温度,利用温度梯度法计算热流获得传热系数。结果表明:两相介质的流动速度随径向高度增大呈现先增大后减小趋势,在无量纲径向高度为0.6时流速最大。轴承腔中转子及壁面之间的区域两相介质的温度随径向坐标增大呈现先减小后增大趋势。轴承腔内滑油主要分布在回油池及轴承腔外壁面上,回油池旁边其剪力分量和重力方向一致区域的油膜较薄,局部传热系数较小,其方向相反区域的油膜较厚,局部传热系数较大。To obtain the flow and thermal analysis methods of oil air two-phase medium in bearing chamber, and find out the rule of flow and heat transfer in oil air two-phase medium, the flow velocity, temperature distribution, volume fraction and heat transfer coefficient distribution of two-phase medium in the engine bearing chamber were analyzed by CFD methods. Based on the local temperature in different positions of the bearing chamber, the heat transfer coefficient was obtained by calculating the heat flow under the temperature gradient method. The results showed that: the flow velocity of two-phase medum increased first then decreased with the increase of radial height, its maximum appeared when the dimensionless radial height was 0.6. The temperature of two-phase medium in the area between the rotor and the wall in the bearing chamber decreased first and then increased during the increase of radial coordinates. The oil in the bearing chamber was mainly distributed on the oil scavenger structure and the outer wall of the bearing chamber. The oil film in the area of the same shear component and gravity direction nearby the oil scavenger structure was thinner, the local heat transfer coefficient was smaller;the oil film in the area at opposite direction was thicker, and the local heat transfer coefficient was larger.

关 键 词：轴承腔 油气两相介质 油膜 流动分析 换热分析 传热系数 

分 类 号：V233.4[航空宇航科学与技术—航空宇航推进理论与工程]