Study of Lubricant Jet Flow Phenomena in Spur Gears

Akin, L. S.; Mross, J. J.; Townsend, D. P.

doi:10.1115/1.3452576

Cited by 28 publications

(26 citation statements)

References 4 publications

(6 reference statements)

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“…For such issue, a lot of empirical correlations have been developed by many researchers to predict the liquid column trajectory, breakup distance , and height , for various flow conditions [9,10]. The main parameter governing the phenomenon is the liquid to gas momentum ratio (3) while the crossflow Weber number, (4), is the parameter that controls the breakup regime […”

Section: Operating Conditionsmentioning

confidence: 99%

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Numerical Simulation of Oil Jet Lubrication for High Speed Gears

Fondelli

Andreini

Soghe³

et al. 2015

International Journal of Aerospace Engineering

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The Geared Turbofan technology is one of the most promising engine configurations to significantly reduce the specific fuel consumption. In this architecture, a power epicyclical gearbox is interposed between the fan and the low pressure spool. Thanks to the gearbox, fan and low pressure spool can turn at different speed, leading to higher engine bypass ratio. Therefore the gearbox efficiency becomes a key parameter for such technology. Further improvement of efficiency can be achieved developing a physical understanding of fluid dynamic losses within the transmission system. These losses are mainly related to viscous effects and they are directly connected to the lubrication method. In this work, the oil injection losses have been studied by means of CFD simulations. A numerical study of a single oil jet impinging on a single high speed gear has been carried out using the VOF method. The aim of this analysis is to evaluate the resistant torque due to the oil jet lubrication, correlating the torque data with the oil-gear interaction phases. URANS calculations have been performed using an adaptive meshing approach, as a way of significantly reducing the simulation costs. A global sensitivity analysis of adopted models has been carried out and a numerical setup has been defined.

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Section: Operating Conditionsmentioning

confidence: 99%

“…Akin et al [4] conducted several experimental tests about spur gear oil jet lubrication, varying gear and oil jet velocity. Pictures of oil jet lubrication were taken with a high speed motion camera, illuminating the lubricant with a xenon lamp.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Oil Jet Lubrication for High Speed Gears

Fondelli

Andreini

Soghe³

et al. 2015

International Journal of Aerospace Engineering

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“…Due to the limited application of this type of lubrication (mostly in the aerospace industry), there have been few studies reported in the open literature with regard to the modelling of jet lubrication and prediction of performance. Those presented are mostly concerned with surface oil availability and penetration depth into the gear teeth conjunctions using an impinging oil jet [13,14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of an Oil Jet-Dry Sump Transmission Gear Under Mixed-Elastohydrodynamic Conditions

Fatourehchi

Shahmohamadi

Mohammadpour

et al. 2018

Journal of Tribology

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Improved fuel efficiency and reduced emissions are key drivers for modern drivetrain systems. Therefore, in recent years, dry sumps with air–oil mist lubrication have been used for efficient transmission design in order to reduce the churning losses. With dry sumps, appropriate cooling measures should be implemented to dissipate the generated contact heat in an efficient manner. This paper integrates a tribological model with three-dimensional (3D) thermofluid analysis in order to predict the heat generated in the lubricated meshing gear contacts and its dissipation rate by an impinging oil jet in air–oil mist environment. Such an approach has not hitherto been reported in literature. The results show that the generated heat under realistic conditions cannot be entirely dissipated by the impinging oil jet in the air–oil mist transmission casing. Numerical results are used to derive extrapolated regressed equations for heat transfer purposes for time-efficient analysis. These conform well with the detailed numerical results.

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“…The oil jet penetration onto the gear tooth flank can be determined by the method of [10,11]..-Iowaver, a more 6curate analysis is being developed The high load and high speed with the small jet size could not be run except at the highest pressure because of scoring. From these plots, the effect of different speed at constant load and the effect of oil jet pres sure on both average surface temperature and temperature variations can be seen.…”

Section: Gear Temperature Analysismentioning

confidence: 99%

Analytical and Experimental Spur Gear Tooth Temperature as Affected by Operating Variables

Townsend

Akin²

1981

Journal of Mechanical Design

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A gear tooth temperature analysis was performed using a finite element method combined with a calculated heat input, calculated oil jet impingement depth, and estimated heat transfer coefficients. Experimental measurements of gear tooth average surface temperatures and instantaneous surface temperatures were made with a fast response infrared radiometric microscope. Increased oil jet pressure had a significant effect on both average and peak surface temperatures at both high load and speeds. Increasing the speed at constant load and increasing the load at constant speed causes a significant rise in average and peak surface temperatures of gear teeth. The oil jet pressure required for adequate cooling at high speed and load conditions must be high enough to get full depth penetration of the teeth. Calculated and experimental results were in good agreement with high oil jet penetration but showed poor agreement with low oil jet penetration depth.

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Study of Lubricant Jet Flow Phenomena in Spur Gears

Cited by 28 publications

References 4 publications

Numerical Simulation of Oil Jet Lubrication for High Speed Gears

Numerical Simulation of Oil Jet Lubrication for High Speed Gears

Thermal Analysis of an Oil Jet-Dry Sump Transmission Gear Under Mixed-Elastohydrodynamic Conditions

Analytical and Experimental Spur Gear Tooth Temperature as Affected by Operating Variables

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