Cavitation Mechanism of Oil-Film Bearing and Development of a New Gaseous Cavitation Model Based on Air Solubility

Li, Xuesong; Song, Yin; Hao, Zhixiu; Gu, Chen

doi:10.1115/1.4006702

Cited by 38 publications

(39 citation statements)

References 17 publications

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“…29 Since the major source of gaseous cavitation is the emission of air dissolved in the lubricant when the pressure decreases, the amount of gas/air in the cavitation region can be calculated based on the change of the solubility. As suggested in the authors' previous research, [30][31][32] when air is assumed to be fully dissolved in the lubricant before entering the bearing, the standard volume of the emitted air within a fluid micelle can be expressed as follows…”

Section: The Gaseous Cavitation Modelmentioning

confidence: 99%

Development and validation of a gaseous cavitation model for hydrodynamic lubrication

Song

Ren

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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The prediction of cavitation in lubricants is of significance to the design and analysis of hydrodynamic bearings. In this paper, a numerical model for the gaseous cavitation in hydrodynamic lubrication problems is derived based on the cavitation mechanism and origination, which is different from the conventional cavitation conditions. The proposed gaseous cavitation model is then used to calculate the performance of several types of bearings, including a two-axially grooved plain journal bearing, a misaligned journal bearing and parallel thrust bearings with surface textures. The results are validated with experimental data and numerical results calculated by the Half-Sommerfeld, Reynolds, and JFO conditions. The advantage of this new model lies in its accuracy and its independence from the cavitation pressure, which is usually difficult to be accurately defined. Thus this gaseous cavitation model can be useful in the accurate prediction of the cavitation phenomenon and performance of hydrodynamic bearings under steady state.

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Section: The Gaseous Cavitation Modelmentioning

confidence: 99%

Development and validation of a gaseous cavitation model for hydrodynamic lubrication

Song

Ren

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Gao et al [10] analyzed the relationship between eccentricity and sommerfeld number of water lubricated bearings using the cavitation model. Li et al [11] proposed a new cavitation model based on air solubility, which provided a new idea for the cavitation model development of low vapor pressure lubricant. Guo et al [12] established a three-dimensional gas-liquid mixed-phase CFD model, and analyzed the effect of noncondensing gas on the pressure field and phase field using a fully cavitated model.…”

Section: Introductionmentioning

confidence: 99%

Combined Influence of Noncondensable Gas Mass Fraction and Mathematical Model on Cavitation Performance of Bearing

Wang

Liu

Yuan

et al. 2020

International Journal of Rotating Machinery

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The presence of cavitation in the oil film seriously affects the bearing lubrication performance and bearing capacity. Now the research of this phenomenon mostly focuses on the model of Reynolds equation (R-E equation) or Navier-Stokes equation (N-S), the influence of the two computation models is less analyzed, and the effect of noncondensable gas (NCG) mass fraction on the bearing performance is seldom studied. In the manuscript, the cavitation mechanism is studied using the mixed model of three-dimensional N-S equation and Jakobsson-Floberg-Olsson (JFO) condition of two dimensional Reynolds equation, and the influence of rotational speed and NCG mass fraction on the cavitationoil film pressure, and bearing capacity was studied. The results show that the change trend of cavitation with the rotational speed is basically consistent for N-S equation and R-E equation. The bearing capacity calculated by N-S equation is greater than that calculated by R-E equation. The peak pressure and bearing capacity of film can be improved by increasing the NCG mass fraction of lubricant and rotational speed.

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“…However, due to the limitation of the impeller structure, there is inevitably a gap between the rotating blades and the fixed impeller chamber [6,7]. The tip leakage flow (TLF) and tip leakage vortex (TLV) is induced by the existence of the gap, which results in pressure drop and energy loss, and then leads to cavitation, erosion, vibration and noise [8][9][10][11][12]. The radiated noise from these hydraulic machineries will harm the worker health and can be easily detected by the enemy sonar systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

et al. 2019

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In the present paper, the effect of the proposed T-shape tip on the energy performance, flow patterns and broadband noise sources of a NACA0009 hydrofoil with tip clearance is investigated. The vortex induced by the gap is simulated by means of the SST k-ω turbulence model, and then, the noise generated by dipoles and quadrupoles are analyzed by using the Curle acoustic analogy and Proudman acoustic analogy, respectively. The numerical simulation results agree well with the experimental measurements. Results indicate that three tip shapes, including the half pressure side T-shape model (MPT), the half suction side T-shape model (MST) and the T-shape model (MT), have complex influence on energy performance of the foil. Only the MST model can promote the energy performance of the hydrofoil at all inlet velocities, with the maximum ratio of lift coefficient to drag coefficient increasing by 4.26%. In addition, the ratio of lift coefficient to drag coefficient for MT obviously increases when the inlet velocity is 7.5 m/s, 10 m/s, 12.5 m/s and 15 m/s, and the maximum promotion is 15.21% at 7.5 m/s. The T-shape tip can effectively suppress the tip clearance leakage vortex, which makes the vortex area decrease with a maximum drop of 5.02%. Furthermore, the MPT and MT have good suppression effect on the hydrofoil dipole noise, and reduce the maximum Curle Acoustic Power (AP) of the foil with 2.64% and 3.03%, respectively. The MST model obviously reduces the isosurface area of the Proudman AP by 6.55% for 55 dB.

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Cavitation Mechanism of Oil-Film Bearing and Development of a New Gaseous Cavitation Model Based on Air Solubility

Cited by 38 publications

References 17 publications

Development and validation of a gaseous cavitation model for hydrodynamic lubrication

Development and validation of a gaseous cavitation model for hydrodynamic lubrication

Combined Influence of Noncondensable Gas Mass Fraction and Mathematical Model on Cavitation Performance of Bearing

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

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