Grease flow in an elbow channel

Westerberg, Lars-Göran; Farré-Lladós, Josep; Li, Jinxia; Höglund, Erik; Casals‐Terré, Jasmina

doi:10.1007/s11249-015-0469-6

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The LiX10 grease has a more continuous development from rest to stationary conditions. A stick-slip [23] behavior was observed the first 20 min: the velocity increased linearly the first few minutes and then for around 15 min, it was more or less constant; then, there is another increase period for 10 min before the stationary conditions are reached. The stick-slip behavior is due to the composition (thickener structure) of the grease, which, at low shear rates, gives the grease an elastic behavior.…”

Section: Transitional Flow In the Channelmentioning

confidence: 92%

On the Flow Dynamics of Polymer Greases

et al. 2022

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In this paper, the flow dynamics of polymer greases was investigated using micro-particle image velocimetry. Polymer greases have a different thickener structure, compared to widely used lithium-based greases, and they have the well-known ability to release oil. How these properties affect grease deformation and its ability to flow is investigated and compared to the corresponding behavior of a lithium complex grease with the same consistency. Two main tests were carried out, where velocity profiles in a straight channel were measured and analyzed, and velocity evolution during the transition period from a no-flow to a fully-established flow was measured, respectively. It was found that the polymer grease flow dynamics is different from that of the lithium grease. This indicates that the internal structure of the grease and the grease ability to bleed oil have a strong influence on the deformation on a global scale, which in turn entails other lubricating abilities for the two grease types.

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Section: Transitional Flow In the Channelmentioning

confidence: 92%

On the Flow Dynamics of Polymer Greases

et al. 2022

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“…Regarding the use of wind turbine bearing micro-nozzles, Westerberg et al [ 170 ] used particle image velocimetry to estimate the grease flow in the elbow channel when using wind turbine bearing micro-nozzles. Grease flow in the elbow channel was investigated based on bearing grease rheology and flow conditions, with the effect of pressure on the flow in the channel simulated by establishing a rheological model.…”

Section: Research On Bearings Lubrication Technology Of Wind Turbinementioning

confidence: 99%

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

et al. 2022

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Wind power, being a recyclable and renewable resource, makes for a sizable portion of the new energy generation sector. Nonetheless, the wind energy industry is experiencing early failure of important components of wind turbines, with the majority of these issues also involving wind power bearings. Bearing dependability is directly tied to the transmission efficiency and work performance of wind turbines as one of its major components. The majority of wind turbine failures are due to bearings, and the vast majority of bearing failures are due to lubrication. The topic of improving the accuracy and life of wind power bearing motion is becoming increasingly essential as the wind power industry develops rapidly. This study examines the various constructions and types of wind turbines, as well as their bearings. We also examined the most typical causes of friction and lubrication failure. Furthermore, contemporary research on wind turbine bearings has been compiled, which mostly comprises the study and development of lubrication technology and other areas. Finally, a conclusion and outlook on current challenges, as well as future research directions, are offered.

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“…The actual grease properties allowed the grease to remain in the position where it is injected; in this case the tooth flank, but it's fluency through the proposed micro-nozzle should be verified. For more details on the grease flow dynamics in an elbow channel, the study done by Westerberg et al [18] provides more details.…”

Section: Grease Fluency Studymentioning

confidence: 99%

New method for lubricating wind turbine pitch gears using embedded micro-nozzles

2017

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Journal of mechanical science and technology.La publicació final està disponible a Springer a través de http://dx.doi.org/10.1007/s12206-017-0131-3 This is a copy of the author 's final draft version of an article published in the journal Journal of mechanical science and technology. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- AbstractThe increase of power generated by wind turbines has increased the stresses applied in all of its parts, which causes the appearance of premature failures. In particular, pitch and yaw gears suffer of excessive wear, mainly due to inappropriate lubrication. This paper presents a novel method to automatically lubricate the wind turbine pitch gear during operation. A micro-nozzle to continuously inject fresh grease between the teeth in contact was designed, manufactured and installed in a test bench of a 2 MW wind turbine pitch system. The test bench was used to characterize the fatigue behavior of the gear surface using conventional wind turbine greases under real cyclic loads. The measurements of wear evolution in a pitch gear with and without micro-nozzle show a decrease of 70% of the wear coefficient after 2x10 4 cycles.

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Grease flow in an elbow channel

Cited by 8 publications

References 24 publications

On the Flow Dynamics of Polymer Greases

On the Flow Dynamics of Polymer Greases

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

New method for lubricating wind turbine pitch gears using embedded micro-nozzles

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