指尖密封流动与变形三维双向耦合分析  

Three Dimensional and Two-way Coupling Simulation on Flow and Displacement of Finger Seals

作　　者：崔雪超 胡娅萍[1] 李朋飞 李华 吉洪湖[1] CUI Xuechao;HU Yaping;LI Pengfei;LI Hua;JI Honghu(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing Jiangsu 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《润滑与密封》2023年第6期86-94,共9页Lubrication Engineering

基　　金：国家自然科学基金项目(51106072)。

摘　　要：针对指尖密封提出泄漏流动和固体变形的三维双向耦合计算方法。该方法采用多孔介质模型计算密封片组泄漏流场,将流场计算得到的压力分布加载到有限元模型上进行密封的固体变形计算,再根据变形计算结果更新多孔介质模型参数,重新计算泄漏流动;如此重复,直至泄漏流动和固体变形计算均达到收敛。采用该计算方法,对不同压差下指尖密封的泄漏流动与固体变形进行计算。计算结果表明:流动与变形的耦合计算经过3次迭代达到收敛;指尖密封结构的压降、泄漏及变形主要发生在指尖靴区域,密封片组的最大变形主要取决于径向变形;当上下游压差从0.1 MPa增大至0.5 MPa,密封片的最大径向变形增大约2%,最大轴向变形增大约400%,泄漏量增大约130%。A 3D two-way coupling simulation method was proposed for the leakage flow and solid displacement of finger seal.In this method,the porous media model was used to calculate the leakage flow field,and the pressure value calculated by the flow field was loaded onto the finite element model for the calculation of the displacement of the seal.Then the parameters of the porous medium model of the seal laminates group were updated,which was used to recalculate the leakage flow.The above steps were repeated until the simulation of leakage flow and solid displacement converge.Using this method,the leakage flow and solid displacement of finger seal with different pressure differences were numerically simulated.The results show that the coupling calculation converges after three iterations.The pressure dropping,leakage and displacement mainly occur in the area around the finger foot,and the maximum displacement of the seal group mainly depends on the radial displacement.When the differential pressure increases from 0.1 MPa to 0.5 MPa,the maximum radial displacement of the seal increases by about 2%,the maximum axial displacement increases by about 400%,and the leakage increases by about 130%.

关 键 词：指尖密封 流动 变形 双向耦合计算 多孔介质模型 

分 类 号：TB42[一般工业技术]