Development of Hybrid Gas Bearing Effectively Stabilized by Water Evaporation from Ultra-Fine Porous Medium

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A hybrid gas bearing effectively stabilized by water evaporation from ultra-fine porous medium is proposed and its basic characteristics are clarified by numerical simulation and experiment. The proposed bearing aims to be applied to MGT (Micro Gas Turbine) and has mainly three advantages suitable for application to MGT. The first is the stability improved by water evaporation from ultra-fine porous medium. The second is the effective lubrication by liquid water at the start and stop of the journal rotation. The third is the cooling effect on the high-temperature journal due to water evaporation. Numerical analysis revealed that the hybrid gas bearing is more stable than a conventional gas bearing. The characteristics of the start-up, liquid lubrication and transition state were experimentally examined with heating of journal, and finally the vapor lubrication was achieved.