Thermohydrodynamic Lubrication in a Turbulent Flow Regime and Wear in Face Seal

• Main Authors: Chih-Chung Yao, 姚志中
• Other Authors: Jen-Fin Lin
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/92462739343243765867

碩士 === 國立成功大學 === 機械工程研究所 === 81 === A model of face seal thermohydrodynamic lubrication in turbulent regime is developed. The lubrication for the roughness of seal surface with orientation and subject to plastic deformation is considered in the analysis. Concerning the asperity deformation, the surface roughness in lubricated region is assumed to be subject to normal load only, the plastic deformation of the surface asperity are evaluated on the basic of volume conservation and the elastic-exponential hardening model. Predictions of the ratio of hydrodynamic load to asperity load are made for a radially-inward face seal where the hydrodynamic lubrication is caused by the surface with the circumferentially- or radially-oriented roughness on the face seal. Reynold's equation for the surface with the roughness in the circumferential dircetion was derived in terms of the concept of porosity. The permeability of the flow due to the influence of film thickness is successfully achieved by Daucy's law in conjuction with the average model developed by Pair and Cheng[16]. The equilibrium solutions to the porblem yield one- dimensional hydrodynamic and asperity contact distribytions, mean film thickness, plastic deformation, and fictional force for a given load on the face seals.The solutions of hydrodynamic pressuer are found using finite element method, whereas the temperatuer distributions are solved in terms of the finite difference method.