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Investigation of the Dynamic Behaviour of Fluid Film Journal Bearings with the Use of Bio-Lubricants
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DOI: https://doi.org/10.15866/ireme.v16i11.22872
Abstract
The dynamic performance of the journal bearings working with biolubricants and common oils has been tested. The Computational Fluid Dynamics (CFD) method in ANSYS Fluent is used to simulate numerically the three-dimensional bearing models. The pressure distribution for the biolubricant oil; (AWS-100), synthetic oil; (SAE-10W40) and the mineral oil; (SAE-30) is presented. The dynamic coefficients of journal bearing are investigated under the three lubricant oils types. The results have shown that the use of biolubricant increases the maximum pressure, the reaction forces and the attitude angle and decreases oil film thickness compared with the use of other lubrication oils. The use of biolubricant increases the direct stiffness (Kxx), the cross coupled stiffness (Kxy) and the direct damping (Cxx, Cyy), while it decreases the cross coupled stiffness (Kyx) and the direct stiffness (Kyy). As a result of the use of biolubricants, the maximum value of the oil pressure has increased by 11.76% compared to the value of the maximum pressure in the case of using mineral oils.
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