A finite element solution of the Reynolds equation of lubrication with film discontinuities: application to helical groove seals

Jarray, Mohamed; Souchet, Dominique; Henry, Y.; Fatu, Aurelian

doi:10.1088/1757-899x/174/1/012037

Cited by 1 publication

(1 citation statement)

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“…The influence of relative texture depth on the validity of Reynolds equation has also been confirmed by Feldman et al [130] for gas-lubricated parallel surfaces. Inertia effects around groove-like film discontinuities should also be taken into account as demonstrated by Guardino et al [148] and Jarray et al [149]. Through the investigation of the surface roughness effect on air-riding seals, Guardino et al [148] suggested that the difference between the Reynolds equation and full Navier-Stokes equation is less significant for compressible fluids than incompressible conditions.…”

Section: Inertia Effectmentioning

confidence: 99%

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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