Anisotropic heat transfer model of finger seal based on porous media

An anisotropic heat transfer model was built by theoretically analyzing the contact and anisotropic heat transfer characteristics coupled finger seal and fluid flow within the structure on the basis of porous model. Then, an anisotropic heat transfer numerical calculation model was developed on the basis of userdefined scalar (UDS) function of commercial software Fluent, and the heat transfer and flow characteristics of finger seal were simulated. Results showed that the effective thermal conductivity tenser of finger beam and finger foot was related to the factors of porosity, radial and circumferential position, and axial contact resistance. The highest temperature of finger seal appeared slightly downstream the contact surface between finger foot and rotor. Besides, compared with isotropic heat transfer model, the temperature decreased greatly at radial and axial directions in finger foot and lower part of finger beam zones while using anisotropic heat transfer model, however, it remained unchanged in circumference both of them. Seal leakage increased with the increasing pressure differential but kept stable with the increasing rotation speed. The height temperature decreased with the increasing pressure differential but increased with the increasing rotation speed.