Flow performance analysis of different air supply methods for high speed and low friction ball bearing

Yan, Ke; Li, Dong; Zheng, Junhao; Li, Baotong; Wang, Dongfeng; Sun, Yujie

doi:10.1016/j.triboint.2018.01.035

Cited by 41 publications

(19 citation statements)

References 10 publications

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“…The k-ε renormalization group (RNG) turbulence model can better replicate the high strain rate and large deformation flow and is suitable for rotating flow [21]. Many scholars [10,11,[15][16][17][18]22] have adopted the RNG k-ε model to study the fluid flow characteristics in a gearbox or in a bearing cavity, and the simulation results are credible. Consequently, the RNG k-ε model developed by Orzag and Yakhot [23] was employed herein to simulate the turbulence.…”

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

confidence: 99%

“…Chen and Liu [27] used a multi-reference coordinate system to simulate the movement of gears with oil-injected lubrication and obtained the heat transfer law of an accessory gearbox. Numerous other studies have also used the MRF model [15,17,18]. However, these studies have primarily focused on oil-injected lubrication, and the MRF method has not yet been applied to splash lubrication, especially for complex models such as an intermediate gearbox.…”

Section: Multiple Reference Frames (Mrf) Modelmentioning

confidence: 99%

“…They observed that the lubrication effect was better when the oil was jetted outside the engagement. Yan et al [15] clarified the internal fluid flow laws of high-speed ball bearings through simulations and experiments, and discussed the effects of three air supply modes and different rotational speeds on the air distribution, flow velocity, and heat dissipation inside the bearing. However, they did not consider the influence of the oil phase.…”

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

confidence: 99%

Section: Multiple Reference Frames (Mrf) Modelmentioning

confidence: 99%

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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“…Wu et al [7] clarified the correlation between thermal characteristic and oil-air distribution inside the bearings using the VOF multiphase technique. Yan et al [8] conducted the flow performance analysis for high speed ball bearings under different air supply conditions, indicting the vortex distribution, air pressure difference, and thermal dissipation inside the bearings. Wu et al [9] elaborated the •3• modeling process for an accurate CFD model of high speed bearings to simulate the stratified air-oil flow inside the ball bearings, optimizing the configuration of oil jet cooling for the ball bearings.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bearing Structure on Oil-air Flow and Temperature of High Speed Ball Bearing by Combining Nonlinear Dynamic and CFD Model

Deng

Zhao

Qian

et al. 2021

Preprint

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To achieve effective cooling for high speed ball bearings, an investigation on the effect of bearing structure on oil-air flow and temperature inside bearing chamber is necessary. However, accurately defining boundary conditions of CFD model for high speed ball bearings has not been addressed completely. Adopting an improved dynamic model of bearings to calculate movements of balls and power loss to set the movement boundary and heat source of CFD model at high-low speeds and light-heavy loads. Then, rotational speed of cage and temperature of outer ring at various loads are tested to validate this proposed method. At high speeds, enlarging sealing degree of outlet not only reduces the temperature rise of bearings and improves the uniformity of temperature distribution, but also promotes the formation of oil-film on balls’ surfaces without increasing power loss. Yet it can reduce the temperature rise but can’t markedly improve the formation of oil-film at low and ultra-high speeds. Moreover, half birfield cage facing nozzle plays an important role in improving oil volume fraction inside the bearing cavity to reduce the temperature rise of bearings, and the next is birfield cage, they are again corrugated cage and half birfield cage back towards nozzle. These research results provide theoretical guidance for the improvement of bearing structure.

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“…These researchers found that the velocity and pressure distribution of the oil‐air mixture flow in the bearing cavity are uneven and gradually decrease with the increase in air supply speed and oil‐air lubrication air‐inlet rate. Yan et al studied the effect of different air supply modes on the flow performance of high‐speed low‐friction ball bearings; the authors found that the temperature between friction pairs was relatively low under the inner ring air supply mode. Cui et al examined the effect of air supply speed on the contact characteristics of a ring‐block line contact friction pair under oil‐air lubrication conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of air supply speed on point contact sliding wear characteristics under oil‐air lubrication conditions

Liu

Tong

Zhang

et al. 2019

Lubrication Science

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An oil‐air lubrication system is driven by high‐speed air. Oil is transported to the contact portion in the form of fine oil droplets to form a lubrication film, thereby improving lubrication performance among matching pairs. A test for point contact sliding friction and wear was conducted under oil‐air lubrication conditions. Oil‐phase and pressure distributions near the contact zone were investigated through numerical simulation. This study aims to explore the effect of air velocity on sliding wear characteristics of a point contact. Results show that point contact sliding wear is considerably affected by air supply speed. The lubrication performance between friction pairs is optimal under appropriate air supply speed, which can enable the oil‐air pressure and oil‐phase volume fraction near the point contact area to obtain appropriate values that are useful to the spread of fine oil droplets. This process ensures that the sliding friction coefficient and specific wear rate can be reduced. The friction coefficient decreases to approximately 0.027, and the specific wear rate is 1.06 × 10−5 mm3/N·m. Under oil‐air lubrication, microfurrows appear on the worn surfaces of materials with the change in air supply speed. The shape of debris is mainly a flake or block with a few long strip abrasives. The wear mechanism is abrasive.

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Flow performance analysis of different air supply methods for high speed and low friction ball bearing

Cited by 41 publications

References 10 publications

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

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

Effect of Bearing Structure on Oil-air Flow and Temperature of High Speed Ball Bearing by Combining Nonlinear Dynamic and CFD Model

Effect of air supply speed on point contact sliding wear characteristics under oil‐air lubrication conditions

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