摘要
为探究双支点对转轴承腔两相流动及换热特性,利用耦合的CLSVOF两相流方法开展数值研究,对比高低压轴同转、对转形式下的轴承腔流动及换热特征,重点探讨对转条件下,高低压轴转速及双侧供油流量对轴承腔壁面油气分布特征与换热特性的影响。结果表明:不同转向下轴承腔壁面油膜形成过程类似,滑油在壁面以油滴、油矢、油带形式分布;同转形式下壁面流线旋向相同,对转形式下壁面流线旋向则相反,对转提高了轴承腔壁面剪切力及湍流强度,平均换热系数相对提升了16.47%;对转转速越大或转速比越高时,壁面滑油体积分数增大而油膜厚度降低,油膜流速平均增加72.95%,双侧供油量或供油流量比越大时,壁面滑油体积分数与油膜厚度均上升,油膜流速平均增加31.02%;增加转速与供油流量均可提高壁面热流密度,增大换热系数,采用双支点对转形式布局能够一定程度提高轴承腔换热性能,有利于保障发动机的安全可靠运转。
In order to explore the two-phase flow and heat transfer characteristics of the double fulcrum counter-rotating bearing chamber,a computational study was conducted based on the CLSVOF two-phase flow method.The flow and heat transfer characteristics of the bearing chamber were compared under the co-rotating and counter-rotating forms of high and low pressure shaft,with a focus on exploring the effects of high and low pressure shaft counter rotating speed and bilateral oil flow rate on the oil-air distribution and heat transfer charac-teristics of the bearing chamber wall under counter rotating conditions.The results show that,the formation pro-cess of oil film on the bearing chamber wall is similar under different rotation forms,and the oil is distributed in the form of oil drop,oil vector and oil belt on the wall.The flow lines on the wall spin in the same direction in the co-rotating form,and in the opposite direction in the counter-rotating form.The counter rotation increases the wall shear stress and turbulence intensity on the bearing chamber wall,and the average heat transfer coefficient increases by 16.47%.When the counter rotating speed of the shaft or the speed ratio is higher,the oil volume fraction on the wall increases while the oil film thickness decreases,and the average increase in oil film speed is 72.95%.When the bilateral oil flow rate or flow rate ratio is higher,the oil volume fraction and oil film thickness on the chamber wall increase,and the average increase in oil film speed is 31.02%.Increasing the rotating speed and oil flow rate can improve the wall heat flux and the heat transfer coefficient.The double fulcrum counter-rotat-ing layout can improve the heat transfer performance of the bearing chamber to a certain extent,which is condu-cive to ensuring the safe and reliable operation of the engine.
作者
曹逸韬
吕亚国
朱泽韬
李宛蓉
刘振侠
CAO Yitao;LYU Yaguo;ZHU Zetao;LI Wanrong;LIU Zhenxia(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China;United Research Center of Small&Medium-Sized Aero-Engine,Zhuzhou 412002,China;Beijing Power Machinery Institute,Beijing 100074,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2024年第7期171-181,共11页
Journal of Propulsion Technology
基金
国家科技重大专项(J2019-Ⅲ-0023-0067)。
关键词
双支点轴承腔
对转
两相流动及换热
换热系数
CLSVOF方法
Double fulcrum bearing chamber
Counter rotation
Two-phase flow and heat transfer
Heat transfer coefficient
CLSVOF method
