| Summary: | 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.
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