Abstract
The stability characteristics of a 25 mm rotor turboexpander with bump-foil journal-gas-bearing pairs and a pair of pressurized thrust bearing are investigated in this study. The journal-gas-bearing pairs in various inner diameters supply radial support for the rotor with different hydrodynamic gas-film thicknesses, and the pair of pressurized thrust bearings balances the axial forces. The experimental results reveal that the stability of the bump foil gas bearing is achieved over a wide range of diametric clearances and that an optimal nominal diametric clearance exists, thus resulting in high rotation speed with small vibration amplitudes. The maximum turboexpander speed reached 93.3 krpm under the nominal diametric clearance of 0 µm with a maximum synchronous amplitude of less than 20 µm.
| Original language | English |
|---|---|
| Pages (from-to) | 2089-2095 |
| Number of pages | 7 |
| Journal | Journal of Mechanical Science and Technology |
| Volume | 29 |
| Issue number | 5 |
| DOIs | |
| State | Published - 16 May 2015 |
Keywords
- Bump-foil bearing
- Journal-gas bearing
- Nominal clearance
- Vibration amplitude
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