Theory of a gas bearing with spiral grooves, taking account of the effects of slip and of local compressibility

Emel’yanov, A. V.; Emelyanova, L. S.

doi:10.1007/bf01013863

Cited by 1 publication

(2 citation statements)

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“…5 associated with the classic NGT models limit its use and validity. Therefore, numerous efforts were made in order to extend its range by assessing additional effects [60,[112][113][114][115][116][117] such as the influence of (1) the local compressibility across a groove-ridge pair, (2) the end effect at the bearing edges, (3) journals operated at large eccentricities, (4) the effect of a finite number of grooves and (5) the effect of leakage flow. The investigations and the results of these additional effects are discussed in the sections below.…”

Section: Limitations and Enhancement Of The Ngtmentioning

confidence: 99%

“…Besides the load capacity, the local compressibility also has an impact on other factors as well. In 1971 Emel'yanov and Emel'yanova [116] derived fundamental equations that considered both the global and local compressibility as well as the rarefaction effect for logarithmic groove patterns of SGTBs. Their results suggested that the local incompressibility effect overestimated the pressure rise within the fluid film due to both the compressibility and the rarefaction effects.…”

Section: λ = −mentioning

confidence: 99%

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A Review of Grooved Dynamic Gas Bearings

Guenat

Schiffmann

2019

Applied Mechanics Reviews

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This paper offers an extensive review of publications dealing with the modeling, the design, and the experimental investigation of grooved dynamic gas-lubricated bearings. Recent years have witnessed a rise in small-scale and high-speed turbomachinery applications. Besides the well-known gas foil bearings, grooved bearings offer attractive advantages, which unveil their potential in particular at small scale due to the structural simplicity as well as satisfying predictability. This paper starts with a general background of the application of gas-lubricated bearings and introduces and compares the different gas bearing topologies. Further, the state-of-the-art modeling of grooved gas-lubricated bearings is introduced, systematically assessing the advantages and inconveniences of two major approaches, i.e., the narrow groove theory (NGT) and direct discretization method. Since the NGT method is an elegant and efficient approach to model the complex effects of periodic grooves, a critical section is dedicated to the NGT. In a second phase, different models to include additional physical phenomena such as real gas lubrication, rarefaction, or turbulence effects are reviewed. The paper concludes with a critical assessment of the state-of-the-art and indicates potential fields of research that would allow to shed more light into the understanding of these bearings, as well as with some thoughts on the integrated design methodologies of gas bearing supported rotors.

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