Turbulence Effects in Two Journal Bearing Applications

Gardner, W. W.; Ulschmid, J. G.

doi:10.1115/1.3451892

Cited by 34 publications

(11 citation statements)

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“…They did, however, not take any temperature effects into account. Furthermore, there exist several experimental studies on large TPJBs, similar in size to the one considered in this article, see e.g., [17,18], where the results in the latter article indicated that turbulence effects need to be considered at a rotational speed of around 2500 rpm for a moderate load. With this background, the current work is a first step towards assessing whether or not modeling the actual geometry of an LEG portion gives rise to any significant discrepancies between results when compared to the traditional way of modeling the LEG, i.e., with an effective temperature boundary condition at the inlet and ignoring the additional geometry that is the LEG portion.…”

Section: Introductionmentioning

confidence: 81%

Thermal Turbulent Flow in Leading Edge Grooved and Conventional Tilting Pad Journal Bearing Segments—A Comparative Study

2018

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A comparative study between a conventional- and leading edge grooved (LEG) tilting pad journal bearing (TPJB) segment is performed. The developed model uses the Shear Stress Transport (SST) turbulence model, coupled with the energy equation and a partial differential equation for the fluid domain mesh displacement to predict the thermal flow characteristics. Instead of using an effective boundary condition to determine the inlet temperature of the LEG pad and excluding the additional LEG portion, as is common practice, the whole geometry of the LEG is modeled. Several sizes of the LEG portion is investigated and it is shown to have quite a small influence on pressure, temperature, film thickness and turbulence intensity. Moreover, the results also show that the conventional pad gives rise to higher levels of turbulence in the mid plane compared to its LEG counterpart, while the latter has a marginally higher value of turbulence when the volume average value is computed. The maximum value of turbulence is however present in the conventional model.

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Section: Introductionmentioning

confidence: 81%

Thermal Turbulent Flow in Leading Edge Grooved and Conventional Tilting Pad Journal Bearing Segments—A Comparative Study

2018

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“…Thus the turbulent phenomenon must be taken into consideration in the study of dynamics of rotor-bearing system. Some researches have devoted to study the turbulent lubricating with experimental or theoretical methods [1][2][3][4][5][6][7][8][9]. The above researches all emphasized that the usage of turbulent flow analysis would make the analysis of hydrodynamic lubrication more approximating the real situations.…”

Section: Nomenclature Bmentioning

confidence: 98%

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

Chang‐Jian

Chen

2008

Nonlinear Dyn

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This work reports a numerical study undertaken to investigate the dynamic response of a rotor supported by two turbulent flow model journal bearings with nonlinear suspension and lubricated with couple stress fluid under quadratic damping. This may be the first time that analysis of rotor-bearing system considered the quadratic damping effect. The dynamic response of the rotor center and bearing center are studied. The analysis methods employed in this study are inclusive of the dynamic trajectories of the rotor center and bearing center, power spectra, Poincaré maps and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The modeling results provide some useful insights into the design and development of rotor-bearing system for rotating machinery that operates at highly rotational speed and highly nonlinear regimes.

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“…Therefore, the first term in [4] may be dropped, giving: ah Note that -is fixed by the pad configuration, and for a ax pad of fixed inclination it is a constant.…”

Section: Assumptionsmentioning

confidence: 99%

Designing Turbulent Thrust Bearings for Reduced Power Loss

Wilcock¹

1977

A S L E Transactions

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Turbulence Effects in Two Journal Bearing Applications

Cited by 34 publications

References 0 publications

Thermal Turbulent Flow in Leading Edge Grooved and Conventional Tilting Pad Journal Bearing Segments—A Comparative Study

Thermal Turbulent Flow in Leading Edge Grooved and Conventional Tilting Pad Journal Bearing Segments—A Comparative Study

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

Designing Turbulent Thrust Bearings for Reduced Power Loss

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