Study on the Effect of Nozzle Parameters on Annular Flow in Oil-Air Lubrication

Chen, Chang-ye; Jishun, Li; Yu, Yong-jian; Xue, Yujun

doi:10.12783/dtetr/icmeit2018/23381

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…This motivates the new nozzle structure design via both numerical evaluations and experimental validations. Numerical investigations are conducted to explore the influence of nozzle parameters on annular Lubricants 2024, 12, 60 3 of 15 flow formation [28] and oil injection direction [29]. Furthermore, a novel nozzle structure based on a cycloid geometric model is developed with the goal of improving oil utilization efficiency, which is subsequently validated via experiments [30].…”

Section: Introductionmentioning

confidence: 99%

The Enhancement of Oil Delivery and Bearing Performance via a Guiding-Structured Nozzle under Oil–Air Lubrication

Zi,

Chen,

Bai

et al. 2024

Lubricants

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The oil–air lubrication method is specifically employed for high or ultra-high-speed spindle rolling bearings. Under high-speed conditions, the air curtain formed inside the bearing cavity obstructs oil delivery, thereby limiting further increases in spindle rotation speed. To enhance oil delivery capability, a guiding-structured nozzle has been developed to concentrate the jet flow and improve penetration through the air curtain. Tests were conducted on an oil–air lubricated bearing test bench to investigate the impact of nozzle structures and oil types on torque and temperature rise. The results demonstrate that compared to conventional nozzles, the guiding-structured nozzle requires smaller optimal amounts of oil supply, indicating its superior ability to deliver oil. Further examination of oil jet patterns and droplet distributions confirms that the guiding-structured nozzle provides a more concentrated jet flow with uniform distribution and smaller droplet sizes in diameter. These characteristics contribute to highly efficient oil delivery. Additionally, synthetic oils reduce droplet size, torque, and temperature rise in mixed lubrication regimes due to their formation of an anti-friction absorption layer on rubbing surfaces.

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Section: Introductionmentioning

confidence: 99%

The Enhancement of Oil Delivery and Bearing Performance via a Guiding-Structured Nozzle under Oil–Air Lubrication

Zi,

Chen,

Bai

et al. 2024

Lubricants

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“…5,6 The current research on oil-air lubrication mainly focuses on the formation mechanism of air-liquid two-phase flow, [7][8][9][10] impingement property of oil droplets on oil film wall, 11 oil droplet passing through an elastohydrodynamic lubrication contact 12 and structure design of oil-air lubrication nozzle. [13][14][15] Kong et al 16 pointed out that the annular flow formed by oil-air two-phase in the pipeline is conducive to improving the lubrication performance of friction pairs. Zhai et al 17 carried out numerical simulation research on the flow characteristics of oil-air lubrication two-phase flow in high-speed angular contact bearing and pointed out that the volume fraction of oil phase in the bearing cavity decreased with the increase in oil-air inlet distance, whereas the temperature increased.…”

Section: Introductionmentioning

confidence: 99%

“…The current research on oil‐air lubrication mainly focuses on the formation mechanism of air‐liquid two‐phase flow, 7‐10 impingement property of oil droplets on oil film wall, 11 oil droplet passing through an elastohydrodynamic lubrication contact 12 and structure design of oil‐air lubrication nozzle 13‐15 . Kong et al 16 pointed out that the annular flow formed by oil‐air two‐phase in the pipeline is conducive to improving the lubrication performance of friction pairs.…”

Section: Introductionmentioning

confidence: 99%

Effect of oil‐air lubrication on contact temperature and sliding tribological properties

Tong

Zhang

2020

Lubrication Science

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This paper investigated the effect of oil-air lubrication on contact temperature and sliding tribological properties. On the basis of heat transfer theory, a numerical simulation model of forced convection was established. Experiments were conducted using the tribology machine. Results show that in oilair lubrication, forced convection can significantly reduce the temperature at the contact position. Nonlinear decline and decrease in the descent rate of contact temperature were observed with the increase in convective heat transfer coefficient. The convective heat transfer between friction pairs increased with air supply velocity, whereas the sliding friction coefficient initially decreased and then increased. The friction flash temperature reached its lowest value with proper heat dissipation capacity. With the increase in ambient temperatures of the friction pairs, the sliding friction coefficient decreased, whereas the friction flash temperature increased. Influenced by the oil-air lubrication heat dissipation in the test, the wear mechanism of point contact sliding friction was abrasive wear.

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Study on the Effect of Nozzle Parameters on Annular Flow in Oil-Air Lubrication

Cited by 2 publications

References 1 publication

The Enhancement of Oil Delivery and Bearing Performance via a Guiding-Structured Nozzle under Oil–Air Lubrication

The Enhancement of Oil Delivery and Bearing Performance via a Guiding-Structured Nozzle under Oil–Air Lubrication

Effect of oil‐air lubrication on contact temperature and sliding tribological properties

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