CFD Simulation for Reduction of Oil Churning Loss and Windage Loss on Aeroengine Transmission Gears

Arisawa, Hidenori; Nishimura, Masafumi; Imai, Hideyuki; Goi, Tatsuhiko

doi:10.1115/gt2009-59226

Cited by 18 publications

(10 citation statements)

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“…Arisawa et al [6] carried out an experimental and numerical study of the windage and oil churning losses within a prototype bevel gearbox. Lubrication oil was supplied to the gear meshing zone using many jet nozzles.…”

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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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: 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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“…To track the interface between two immiscible fluids (oil and air), the VOF multiphase model presented by Hirt and Nichols [19] was applied herein. Several scholars [10][11][12][13][16][17][18] have used the VOF model to study the coexistence of oil and air phases. This is accomplished by solving the continuity equation of the volume fraction of the oil phase:…”

Section: Numerical Setup 41 Volume Of Fluid (Vof) Multiphase Model mentioning

confidence: 99%

“…Li et al [11] established a two-dimensional (2D) calculation model of splash lubrication for spur gearboxes, and analyzed the influence of the oil content, oil characteristics, and rotational speed on oil distribution using a dynamic mesh model. Arisawa et al [12,13] studied the oil flow state of aero-engine bevel gearboxes with oil injection lubrication and calculated the churning power loss and windage power loss of the bevel gear. Deshpande et al [14] predicted the temperature distribution of gears with oil jet lubrication using CFD.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Investigation of Lubrication and Temperature Characteristics of an Intermediate Gearbox with Splash Lubrication

Wang

Wei

et al. 2020

Applied Sciences

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In this study, we propose a computational fluid dynamics (CFD)-based method to study the lubrication and temperature characteristics of an intermediate gearbox with splash lubrication. A volume of fluid (VOF) multiphase model was used to track the interface between oil and air. A multiple reference frame (MRF) model was adopted to accurately simulate the movement characteristics of the gears, bearings, and the surrounding flow field. The thermal-fluid coupling computational model of an intermediate gearbox with splash lubrication was then established. Combined with experimental results, we verified that the lubricating oil temperature was below the limit requirement (<110 °C). The numerical results revealed that large amounts of lubricating oil were splashed onto the tooth surfaces near the gear meshing area. A large convective heat transfer coefficient corresponds to a low gear tooth surface temperature. The tooth surface temperature of the driving gear is higher than that of the driven gear. The distribution law of oil volume fraction of the bearing roller was jointly affected by the roller rotation direction and gravity. The convective heat transfer coefficient of the roller wall was largely related to the lubrication environment of the roller, including the oil distribution inside the bearing cavity and the flow rate.

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“…A part of this study was delivered to the American Society of Mechanical Engineers (ASME), and in 2009, the paper [12] was selected as the best paper in the aeroengine section of the ASME. Here, we would like to express our special gratitude to all the par ties and persons concerned.…”

Section: Acknowledgmentmentioning

confidence: 99%

Computational Fluid Dynamics Simulations and Experiments for Reduction of Oil Churning Loss and Windage Loss in Aeroengine Transmission Gears

Arisawa

Nishimura

Imai

et al. 2014

Journal of Engineering for Gas Turbines and Power

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C om putational Fluid D ynam ics S im u latio n s and Experim ents for R eduction of Oil Churning Loss and W in d a g e Loss in A ero en g in e Tran sm issio n G earsThe demand for power generation capacity has increased considerably due to the electric drive o f cabin air conditioners and commercial aircraft engines. It is estimated that power losses may increase in the accessory gearbox due to generators and pumps that augment fuel consumption. To reduce these losses, a computational fluid dynamics simu lation technique that analyzes oil churning and windage losses was developed and improvements were made to the shrouds of bevel gears, which have large losses in the gearbox. It was revealed experimentally that shrouding reduced losses up to 36% as com pared to unshrouded gears. Pll = Taa> = Frpco = '^2^-{vp -v i)-vp(1) i where P is the power loss loaded on a gear, T is the torque, F is the force, r is the radius, to is the angular rotational speed, m is the mass, t is time, and v is the speed. The subscript a is the oil

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CFD Simulation for Reduction of Oil Churning Loss and Windage Loss on Aeroengine Transmission Gears

Cited by 18 publications

References 0 publications

Numerical Simulation of Oil Jet Lubrication for High Speed Gears

Numerical Simulation of Oil Jet Lubrication for High Speed Gears

CFD-Based Investigation of Lubrication and Temperature Characteristics of an Intermediate Gearbox with Splash Lubrication

Computational Fluid Dynamics Simulations and Experiments for Reduction of Oil Churning Loss and Windage Loss in Aeroengine Transmission Gears

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