双支点对转轴承腔两相流动及换热特性的数值研究

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 characteristics of the bearing chamber wall under counter rotating conditions. The results show that， the formation process 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-rotating layout can improve the heat transfer performance of the bearing chamber to a certain extent， which is conducive to ensuring the safe and reliable operation of the engine.