CFD investigation of air-oil two-phase flow in oil jet nozzle

Zhong, Jianfeng; Dai, Yu; Liang, Chongyu; Zhu, Xiang; Xu, Lianyi

doi:10.1177/09544062221098944

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…The diagram of the principle of an oil jet lubrication system is shown in Figure 1. During the design and research phase, rolling bearings are tested using bearing testers with oil jet lubrication [4,5]. While the performance of rolling bearings can be evaluated, noticeable differences exist between oil jet lubrication and splash lubrication.…”

Section: Introductionmentioning

confidence: 99%

“…A multiphase numerical simulation and the corresponding tests were conducted to investigate the stratified air-oil flow inside jet cooling ball bearings by Wu et al [16][17][18]. It was discovered that the oil distribution of the During the design and research phase, rolling bearings are tested using bearing testers with oil jet lubrication [4,5]. While the performance of rolling bearings can be evaluated, noticeable differences exist between oil jet lubrication and splash lubrication.…”

Section: Introductionmentioning

confidence: 99%

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Transient Simulation Analysis of Needle Roller Bearing in Oil Jet Lubrication and Planetary Gearbox Lubrication Conditions Based on Computational Fluid Dynamics

Gao,

Hou,

et al. 2024

Lubricants

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The transient lubrication conditions of rolling bearings are different in gearboxes and bearing testers. It has been observed that samples of qualified rolling bearings tested in rolling bearing testers often fail and do not meet lifespan requirements when employed in other lubrication conditions. This may be caused by different factors affecting the bearing in testing and applying lubrication. Needle roller bearings were selected for this study to investigate the causes of this phenomenon in terms of lubrication. Based on the computational fluid dynamics (CFD) method, fluid domain models for the same type of rolling bearings with different lubrication conditions were established. The transient flow fields of rolling bearings with oil jet lubrication in a tester and splash lubrication in a planetary gearbox were simulated. The air–oil transient distribution of rolling bearings in two kinds of lubrication was analyzed. The results indicate that the rotational speed significantly affected the oil jet lubrication of the needle roller bearing. The average oil volume fraction rose by 0.2 with the increase in the bearing speed from 1200 r/min to 6000 r/min and by 0.06 with the increase in the oil jet velocity from 8 m/s to 16 m/s. The splash lubrication of the bearings in the planetary gearbox was directly related to the immersion depth of the rolling bearings in the initial position. Meanwhile, the splash lubrication of the bearings was also affected by other factors, including the initial layout of the planetary gears. The increase in speed from 1200 r/min to 6000 r/min made the average oil volume fraction of splash lubrication decrease by 4.4%. The average oil volume fraction of the bearings with splash lubrication was better than that with oil jet lubrication by an average of 41.9% when the bearing speed was in the low-speed stage, ranging from 1200 r/min to 3600 r/min. On the contrary, the bearings with oil jet lubrication were better than those with splash lubrication by an average of 31.8% when the bearing speed was in the high-speed stage, ranging from 4800 r/min to 6000 r/min.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient Simulation Analysis of Needle Roller Bearing in Oil Jet Lubrication and Planetary Gearbox Lubrication Conditions Based on Computational Fluid Dynamics

Gao,

Hou,

et al. 2024

Lubricants

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“…The calculation results are acceptable for engineering situations. Zhong et al [20] adopted the VOF method and Shear Stress Transfer (SST) k-ω turbulence model to deeply understand the flow characteristics of the nozzle. Payri et al [21] used the VOF approach to analyze the flow inside the nozzle and the first 2-5 mm of the spray.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Characteristics of Airless Spray Film Formation

Yang

Chen

et al. 2022

Coatings

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Based on the computational fluid dynamics (CFD) theory, this paper proposes a film formation model and a numerical simulation method that can be used in thickness prediction of airless spraying robots. The spraying flow field and the film formation process in the airless spraying process were simulated by the Eulerian–Eulerian approach, and the airless spraying film formation model including the paint expansion model and the wall hitting model was established. To verify the correctness of the model, numerical simulations of static spraying and dynamic spraying were carried out on the plane and arc surfaces. The simulation results showed that the width of the spraying flow field on the far wall increased linearly with the longitudinal distance in the major-axis direction. The busbar spraying on the outer surface of the arc surface showed the similar characteristics to the plane in the major-axis direction. Besides, the annular spraying was similar to the plane spraying in the minor-axis direction, but the inner surface spraying was completely opposite. When spraying the outer surface, the film thickness increased with the increase of the inner diameter but was smaller than that of the plane spraying, while the inner surface spraying was completely opposite. In the spraying experiment, the plane dynamic spraying and the arc plane inner and outer surface translation spraying were selected for verification. The experimental results were in good agreement with the simulation results, indicating that the film formation model of airless spraying established in this paper is basically correct. As a result, this model can be used for thickness prediction of spraying robots.

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