Fluid Film Bearings and CFD Modeling: A Review
Abstract
:1. Introduction
2. Fluid Film Bearings
2.1. Theory of Fluid Film Bearings
2.2. Journal Bearings
2.3. Grooved Journal Bearings
2.4. Texturized Journal Bearings
2.5. Journal Bearings with Pockets
2.6. Thrust Bearings
2.7. Tilting-Pad Journal Bearings
2.8. Floating Ring Bearings
2.9. Journal Bearing Lubricated with Magnetorheological Fluids
2.10. Aerostatic Bearings
2.11. Journal Bearings with Misalignments
3. CFD Transient Analysis of Fluid Film Bearings with the Dynamic Mesh Technique
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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(deg) | [K] | [K] | Mass | Viscous Torque [N m] | ||
---|---|---|---|---|---|---|
Without grooves | 0.1936 | 83.4832 | 1.3 | 2.185 | 2.82611 × 10−5 | 3.3935 × 10−4 |
With grooves | 0.2381 | 63.1236 | 1.7 | 0.665 | 10.7848 × 10−5 | 3.2221 × 10−4 |
Values of difference | 22% | −24% | −82% | −228% | 282% | −5% |
Type of Fluid Film Bearing | Characteristics | Applications |
---|---|---|
Journal bearings (plain) | Their load capacity and operation speeds are high for heavy loads (LDN) [1,2], and the wear and stability are low, but the modeling is simple [22,27]. | Fluid films are used to support rotors whose direction of load is normal to the axis of the shaft; for example, ships, generators, turbines, compressors, and others in the automotive, naval, aviation, power generation, construction, and mining industries. Generally, thrust bearings are used in conjunction with journal bearings in many machine tools. However, they are often used in machinery where high accuracy and stability are needed. Aerostatic bearings are also used in many applications where high precision of positioning is required. |
Grooved journal bearing | Their load capacity and operation speeds are high for light loads (LDN); the wear is very low and allows pressurization. the grooves are symmetrically distributed, and the number and geometry are limited [15,18]. Modeling is not difficult [38,39]. | |
Texturized journal bearings | They are suitable for light loads (LDN) at high operating speeds with high stability. The wear is very low and the texture reduces the size of bubbles generated through cavitation [45]. The texture must be in the convergent zone [45,46,47] with limited dimensions. Modeling is not difficult. | |
Journal bearings with pockets | The size of bubbles generated through cavitation is reduced; they allow hybrid operation (lubricant is pressurized) [54,55,56]. Their load capacity (LDN) is high for light loads, the pockets are symmetrically distributed [53], and the modeling is not difficult. | |
Thrust bearings | The load capacity (LDP) is high with low friction and wear. External pressurization increases their stiffness [57], but they operate at low speeds. The modeling is simple, and it is possible to model a section of the entire model [38,39]. | |
Tilting pad journal bearing | They are suitable for heavy loads (LDN) at high operating speeds with high stability [1,2]. The wear is very low, but a reliable oil supply system is necessary; therefore, they can be preloaded. Modeling is very difficult [63,64,68,69]. | |
Floating ring bearing | They have a simple structure and the characteristic of double oil–film support with high efficiency and stability [106]. The inner layer of the fluid becomes hotter. The modeling is difficult. | |
Journal bearing lubricated with an MRF | The fluid properties can be controlled [74]; therefore, the static and dynamic characteristics are variable. However, the fluid temperature is high due to the friction and relatively small load capacity (LDN). The magnetic field produces particle adhesion [77,78,79]. The modeling is difficult. | |
Aerostatic bearing | External pressurization is necessary for their functionality at high speeds; they have low driving power and friction, thermal stability, and low load capacity (LDN) [3]. The clearance, hole diameter, and pressure are factors that affect the static parameters [5,81]. The pressure generates vortices; therefore, the orifice chamber shapes are necessary to suppress the vortices [81,83,84]. | |
Journal bearings with misalignment | These bearings consider misalignment in the analysis and modeling. The analysis is similar to that of the bearings above [85,90]. The analysis is harder [31,33]. The static parameters are widely affected by misalignment [91,92]. |
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Pérez-Vigueras, D.; Colín-Ocampo, J.; Blanco-Ortega, A.; Campos-Amezcua, R.; Mazón-Valadez, C.; Rodríguez-Reyes, V.I.; Landa-Damas, S.J. Fluid Film Bearings and CFD Modeling: A Review. Machines 2023, 11, 1030. https://doi.org/10.3390/machines11111030
Pérez-Vigueras D, Colín-Ocampo J, Blanco-Ortega A, Campos-Amezcua R, Mazón-Valadez C, Rodríguez-Reyes VI, Landa-Damas SJ. Fluid Film Bearings and CFD Modeling: A Review. Machines. 2023; 11(11):1030. https://doi.org/10.3390/machines11111030
Chicago/Turabian StylePérez-Vigueras, Demetrio, Jorge Colín-Ocampo, Andrés Blanco-Ortega, Rafael Campos-Amezcua, Cuauhtémoc Mazón-Valadez, Víctor I. Rodríguez-Reyes, and Saulo Jesús Landa-Damas. 2023. "Fluid Film Bearings and CFD Modeling: A Review" Machines 11, no. 11: 1030. https://doi.org/10.3390/machines11111030