Analysis of temperature field and convection heat transfer of oil-air two-phase flow for ball bearing with under-race lubrication

Bao, Heyun; Hou, Xiaonan; Tang, Xin; Lu, Fengxia

doi:10.1108/ilt-03-2021-0067

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…In addition, the coordinates and rotation axis of the spin of the rollers were calculated, and the influence of the spin of the rollers on the oil distribution and volume fraction was discussed. Bao et al [23] employed a similar numerical method to track the oil-air two-phase flow inside the ball bearing with under-race lubrication and evaluated the influence of various factors on the oil volume fraction. Jiang et al [24], considering the structure of the oil supply channel in the inner ring, investigated the effects of operating parameters and nozzle configuration on the distribution behavior of lubricant oil in the bearing.…”

Section: Introductionmentioning

confidence: 99%

Oil–Air Two-Phase Flow Distribution Characteristics inside Cylindrical Roller Bearing with Under-Race Lubrication

Gao,

Li,

et al. 2024

Lubricants

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A deep understanding of oil behavior inside roller bearings is important for the precise design of bearing configurations and oil systems in aircraft engines. The numerical method is employed to track oil distribution inside cylindrical roller bearings with under-race lubrication along the circumference and radial direction, respectively. The results demonstrate that oil distribution along the circumference is periodic with the number of under-race nozzles, and higher rotating speed and lower flow rate would reduce the fluctuation amplitude. It is difficult for oil to flow through the gap between the cage pocket and rollers, and higher oil viscosity would worsen it further. In some extreme cases, the oil volume fraction near the outer race may be lower than 0.7%, causing the risk of lubricating and cooling failure. Thus, more attention should be paid to the outer race of the roller bearing with under-race lubrication, especially during the starting stage of the engine and in cold weather.

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Section: Introductionmentioning

confidence: 99%

Oil–Air Two-Phase Flow Distribution Characteristics inside Cylindrical Roller Bearing with Under-Race Lubrication

Gao,

Li,

et al. 2024

Lubricants

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“…Oil–air lubrication, compared with oil bath, oil mist, oil spray and splash lubrication, is a more efficient way to reduce friction and temperature in view of its higher lubricating efficiency and much less oil consumption, and thus is widely employed in lubricating high-speed support bearings (Gao et al , 2021). Parker and Signer (1997) introduced the lubricant scale factor to investigate the influence of oil–air mixture on the heat dissipation of bearings; Li et al (2018) discussed the effect of air inlet flow rate on the flow uniformity in bearing cavities; Yan et al (2021) applied the field synergy principle to explain the fluid flow and lubrication in bearings, and then compared the temperature variation with different oil–air supply methods; Peterson et al (2021) simulated the fluid field of deep groove ball bearings by CFD; Deng et al (2022) combined nonlinear dynamic and CFD models to explore the oil–air flow and temperature distribution inside bearing chambers; with the coupled level set volume of fluid method and 3D finite element model, Bao et al (2021) investigated the oil–air two-phase flow characteristics with under-race lubrication, and then analyzed the influence of various factors on the oil volume fraction inside ball bearings.…”

Section: Introductionmentioning

confidence: 99%

An efficient thermal model for high-speed angular contact ball bearings based on oil-air two-phase flow and gray-box model

Zheng,

Zheng

2023

ILT

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Purpose For a lightweight and accurate description of bearing temperature, this paper aims to present an efficient semi-empirical model with oil–air two-phase flow and gray-box model. Design/methodology/approach First, the role of lubricant/coolant in bearing temperature was discussed separately, and the gray-box models on the heat convection inside a bearing cavity were also created. Next, the bearing node setting scheme was optimized. Consequently, a novel semi-empirical two-phase flow thermal grid for high-speed angular contact ball bearings was planned. With this model, the thermal network for the selected motored spindle was built, and the numerical solutions for bearing temperature rise were obtained and contrasted with the experimental values for validation. The polynomial interpolation on test data, meanwhile, was also performed to help us observe the temperature change trend. Finally, the simulations based on the current models of bearings were implemented, whose corresponding results were also compared with our research work. Findings The validation result indicates that the thermal prediction is more accurate and efficient when the developed semi-empirical oil–air two-phase flow model is employed to assess the thermal change of bearings. Clearly, we provide a more proper model for the thermal assessment of bearing and even spindle heating. Originality/value To the best of the authors’ knowledge, this paper introduced the oil–air separation and gray-box model for the first time to describe the heat exchange inside bearing cavities and accordingly presents an efficient semi-empirical oil–air two-phase flow model to evaluate the bearing temperature variation by using thermal network method. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2023-0180/

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“…Considering the impact of bearing load reduction, the effects of axial and radial grooves on the outer ring on the maximum deformation and stress of the outer ring were studied, and the maximum stress and groove size of the outer ring were determined to provide a basis for the selection and design of sensor modules. Bao et al [24] established a simplified three-dimensional heat transfer model of lubricated ball bearings under raceways. The coupled liquid level setting volume method was used to track the oil-gas two-phase flow, and the Palmgren method was used to calculate the heat generation.…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Analysis of High-Speed Bearings Considering Frictional Heat and Interactive Effects

Zheng¹

2023

IJHT

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The temperature of bearings has a significant impact on their service life and flexibility, so it becomes more important to analyze the temperature field of bearings in high-speed electric spindle machining applications. Scholars at home and abroad have completed the thermal characteristics analysis of high-speed bearings from multiple perspectives such as frictional heat generation, heat transfer, and thermal analysis, but there is less consideration of the effects of spin, rotation speed, and external loads on the temperature field, and the complex motion between various components inside the bearing is also ignored. There are even fewer transient thermal analyses of high-speed bearings using the ANSYS finite element analysis method. Therefore, this paper carries out a temperature field analysis of high-speed bearings considering the interactive effects of frictional heat generation. Firstly, the motion laws of bearings and the mechanism of friction generation are analyzed, and a high-speed bearing frictional heat generation calculation analysis model that conforms to actual working conditions is established. Based on the ANSYS finite element analysis software, the temperature field of high-speed bearings is analyzed, and the internal temperature field distribution law is obtained by exploring the effects of spin, rotation speed, and external loads on their temperature field. Finally, the paper presents experimental analysis results, which verify the effectiveness of the proposed calculation method and the established model.

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Analysis of temperature field and convection heat transfer of oil-air two-phase flow for ball bearing with under-race lubrication

Cited by 9 publications

References 21 publications

Oil–Air Two-Phase Flow Distribution Characteristics inside Cylindrical Roller Bearing with Under-Race Lubrication

Oil–Air Two-Phase Flow Distribution Characteristics inside Cylindrical Roller Bearing with Under-Race Lubrication

An efficient thermal model for high-speed angular contact ball bearings based on oil-air two-phase flow and gray-box model

Temperature Field Analysis of High-Speed Bearings Considering Frictional Heat and Interactive Effects

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