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

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

doi:10.1115/1.4026952

Cited by 29 publications

(12 citation statements)

References 8 publications

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“…To this end, fluid mechanics models are developed to estimate churning behaviour, as presented by Seetharaman and Kahraman [13], who worked on cylindrical gear pairs subject to churning and windage. Arisawa et al [14] also referred to fluid mechanics to simulate churning in aero engine transmissions. Further works are also done concerning analytical formulations to quantify churning power losses, for example, considering multiple flow regimes [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

Laruelle

Fossier

Changenet

et al. 2017

Mechanics & Industry

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Churning losses are a complex phenomenon which generates significant power losses when considering splash lubrication of gear units. However, only few works deal with bevel gears dipped lubrication losses. The objective of this study is to provide a wide variety of experimental tests on churning losses, especially getting interested in geometry of spiral bevel gears influence. A specific test rig was used in order to study a single spiral bevel gear partially immersed in an oil bath. Experiments have been conducted for several operating conditions in terms of speeds, lubricants, temperatures and gear geometries to study their impact on splash lubrication power losses. These experimental results are compared with the predictions from various literature sources. As the results did not agree well with the predictions for all operating conditions, an extended equation derived from previous works is introduced to estimate churning losses of bevel gears.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

Laruelle

Fossier

Changenet

et al. 2017

Mechanics & Industry

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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%

“…To simplify the calculation, this paper applies the bearing heat source calculated by Palmgren's method to the inner ring raceway, the roller wall surface, and the outer ring raceway, according to the ratio of 1:2:1. In this study, all heat sources were applied to the corresponding contact zones in the form of volumetric heat sources, as boundary conditions [13]. The coupled thermal condition was adopted at the fluid-solid interface to simultaneously calculate heat convection and heat conduction.…”

Section: Boundary Conditionsmentioning

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%

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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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“…For the interface recognition, we use the rigid and gas volume fractions (see figure 1). Note that such an approach has been already applied to practical problems [3]. We implement novel methods to realize efficient and robust simulations of the gas-liquid flow interacting with the rigid body [4].…”

Section: Introductionmentioning

confidence: 99%

A Fixed-Mesh Approach for Gas-Liquid-Rigid Interaction Problems

Sugiyama

Okubo

Imahoko

et al. 2016

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.A fixed-mesh approach has been developed to facilitate predicting a certain class of gas-liquid-rigid interaction problems. All the basic equations are discretized on a Cartesian grid in a finite-difference manner. The Volume-Of-Fluid and Boundary Data Immersion methods are employed to treat the gas-liquid and fluid-rigid interfaces, respectively. A hybrid OpenMP-MPI approach is adopted for parallel computing. The developed code is validated through comparisons with experiments of an oil-air flow driven by a rotating disk with holes. The simulated results demonstrate the capability in capturing the velocity distributions. IntroductionGas-liquid flows driven by rotating rigid objects appear in many engineering applications. The interplay among centrifugal, buoyancy, viscous and surface tension forces gives rise to a rich behaviour involving the gas-liquid and fluid-rigid interface motions. Large-scale simulations of multiphase flows are expected to be useful for complementing experiments and gaining insight into the dynamics. It is desirable that the numerical method is efficient and robust for massively parallel computing.Direct numerical simulation of interfacial flows is often formidable mainly due to the spatiotemporal change in moving and deforming interface and the high degree of freedom. There are currently several approaches classified with respect to the numerical treatment how the kinematic and dynamic interactions are coupled on the interface. When addressing fluid engineering problems of practical applications with complex boundary, one has preferably employed a Lagrangian method using a finite element mesh. The numerical methods include Arbitrary Lagrangian Eulerian [1] and Deforming-Spatial-Domain/Stabilized Space-Time [2] approaches. If the body-fitted mesh is provided, the state-of-the-art Lagrangian approaches are satisfactory for achieving accurate predictions. However, for a system involving complex boundary, it requires considerable efforts to generate the high quality mesh and to reconstruct the mesh topology when the mesh element is added or deleted. Moreover, in parallel computing, one often encounters nontrivial issues how to keep the computational-load balance of each compute node in the domain decomposition, how to optimize the data communication between the Eulerian and Lagrangian frames, and so on. In the present study, we

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

Cited by 29 publications

References 8 publications

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

Experimental investigations and analysis on churning losses of splash lubricated spiral bevel gears

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

A Fixed-Mesh Approach for Gas-Liquid-Rigid Interaction Problems

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