Type of Document	Master's Thesis
Author	Peng, Zhengchun
Author's Email Address	zpeng1@lsu.edu
URN	etd-0410103-191114
Title	Thermohydrodynamic Analysis of Compressible Gas Flow in Compliant Foil Bearings
Degree	Master of Science in Mechanical Engineering (M.S.M.E.)
Department	Mechanical Engineering
Advisory Committee	Advisor Name Title Michael Khonsari Committee Chair Wen-Jin Meng Committee Member Yitshak Ram Committee Member
Keywords	compressible Reynolds' equation thermal feature gas bearing
Date of Defense	2002-11-12
Availability	unrestricted
Abstract This thesis deals with the development of mathematical models and numerical schemes for simulating the hydrodynamic pressure and temperature rise of compliant foil bearings lubricated by a thin gas film in between its compliant bearing surface and the rotating shaft. The model accounts for the compressibility of gas, the compliance of the bearing surface, and the interaction between the pressure field and temperature field of the gas film in the bearing system. Numerical solutions obtained over a fairly large range of operating speeds show excellent agreement with existing experimental data from both load performance test and bearing temperature measurement. A series of parametric study is presented to illustrate the utility of the developed algorithms for characterization of foil bearing performance and guidance of foil bearing design. The numerical algorithm can handle high speeds and high eccentricity ratios, which allows the prediction of realistic performance and characteristics of foil bearings under extreme operating conditions.
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