Application of an unstructured overset method for predicting the gear windage power losses

Dai, Yu; Xu, Lei; Zhu, Xiang; Ouyang, Bin

doi:10.1080/19942060.2020.1858166

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…The overset mesh method provides unique advantages for the rotating motion of complex objects in many cases [36,37]. The overset mesh technology was exploited to achieve the rotating of the spur gear.…”

Section: Computational Domains and Numerical Setupmentioning

confidence: 99%

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

et al. 2022

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As it is widely employed in the aeronautical transmission system, a better understanding of the oil jet lubrication behavior is vital to determine the total system energy consumption. Firstly, this study presents related theoretical models such as the sum of oil jet resistance torque, impingement depth, and wetted area of the oil film for calibrating the physical characteristics of the impact of the oil jet on the gear flank. Then, in terms of the flow phenomenology of the liquid column for the oil jet impact on an isolated spur gear, a detailed transient and spatial flow field analysis becomes available, benefiting from an overset mesh method integrating with a volume-of-fluid (VOF) method. Furthermore, not only the oil jet resistance torque, but also the impingement depth as well as the spatial and temporal evolution of wetted surface by the oil film on the gear tooth given by numerical investigations were compared well with the theoretical calculations.

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Section: Computational Domains and Numerical Setupmentioning

confidence: 99%

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

et al. 2022

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“…Lubrication performance is strongly affected by the nozzle layouts under oil jet lubrication; therefore, a novel gear impingement depth mathematical model has been introduced to determine the oil nozzle layouts [25][26][27]. The rapid development of computational fluid dynamics (CFD) technology has allowed for its used as an effective tool for the deep understanding of real practical engineering problems [28][29][30]. Subsequently, to verify the mathematical model, a computational fluid dynamics model was established and applied to simulate the injection process with the aim of assessing the lubrication performance [31].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nozzle Layouts on the Heat-Flow Coupled Characteristics for Oil-Jet Lubricated Spur Gears

Yang

Zhong

et al. 2023

Lubricants

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Aiming to explore the influence of nozzle layouts on the lubrication and cooling performance of spur gears under oil jet lubrication conditions, this paper introduces a heat-flow coupled analysis method to predict the temperature field of the tooth surface with different nozzle layouts. Firstly, the friction heat formulas integrating the coefficient of friction and average contact stress are presented for calculating heat generation. We also present the impingement depth model, which considers the nozzle orientation parameters, jet velocity, and gear structure of the given spur gear pair for laying out the nozzle. Then, a heat-flow coupled finite element analysis method is exploited to resemble the jet lubrication process and gain the gear temperature characteristics. Finally, the numerical results of this model compare well with those of the experiments, showing that this heat-flow coupled model provides accurate temperature prediction, indicating that the nozzle layouts determined as a function of the oil jet height, deviation distance, and oil injection angle significantly influence the lubrication and cooling performance. Further, this study also reveals that the lubrication performance in cases where the nozzle approaches the side of the pinion is relatively superior.

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“…Additionally, the difference between the two models in terms of the flow field capture was not addressed. Dai et al (2021) used an unstructured OG method to calculate the windage losses in a gearbox. The study, however, explored an isolated gear exclusively and did not provide a treatment scheme for the meshing zone.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of different moving mesh strategies for investigating oil flow inside a gearbox

Liu

2022

HFF

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Purpose This study aims to numerically investigate the multi-phase flow and thermal physics inside gearboxes, which is critical to the theoretical analysis of energy transfer. Design/methodology/approach To explore the churning power losses, a three-dimensional numerical model of the gearbox is built using the RNG k–e turbulence model and three alternative moving mesh strategies (i.e. the dynamic mesh [DM], sliding mesh and immersion solid methods). The influence of the rotational speed on the transient flow field, including the oil distribution, velocity and pressure distribution and the churning losses, is obtained. Finally, the time-dependent thermo-fluid state of the gearbox is predicted. Findings The findings show that the global DM method is preferable for determining the flow structures and power losses. The rotational speed exerts a significant effect on the oil flow and the wheel accounts for most of the churning losses. Based on the instantaneous temperature distribution, the asymmetric configuration leads to the initial bias of the high-temperature region towards the pinion. Additionally, the heat convection efficiency of the tooth tip is slightly higher than that of the tooth root. Originality/value An in-depth understanding of the flow dynamics inside the gearbox is essential for its optimisation to decrease the power and enhance heat dissipation during operation.

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Application of an unstructured overset method for predicting the gear windage power losses

Cited by 13 publications

References 32 publications

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

Numerical Analysis for Wetting Behaviors of an Oil Jet Lubricated Spur Gear

Influence of Nozzle Layouts on the Heat-Flow Coupled Characteristics for Oil-Jet Lubricated Spur Gears

Comparative study of different moving mesh strategies for investigating oil flow inside a gearbox

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