Metal Temperature Correlations in Tilting Pad Journal Bearings

Thorat, Manish; Pettinato, Brian; Choudhury, Pranabesh De

doi:10.1115/1.4027416

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Meanwhile, some scholars adopted the thermoelastohydrodynamic (TEHD) model to research the property of journal bearing. For instance, Thorat et al [ 15 ] computed and measured the metal temperature of bearing by TEHD model and declared that the bearing clearance is important factor influencing the predicted bearing temperature. Nichols et al [ 16 ] investigated the effect of oil feeding rate on bearing performance with a starved flow model based on TEHD.…”

Section: Introductionmentioning

confidence: 99%

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Jiang

Liang²,

Huang³

et al. 2021

Micromachines

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This paper focuses on the flow and thermal characteristics of the lubricant film in the micro clearance of a hydrodynamic journal bearing (HJB) at high rotating speed. A thermohydrodynamic (THD) method consists of the Reynolds equation coupled with energy and viscosity-temperature equation with considering the cavitation is put forward. The 3D surface diagrams of the lubricant film thickness, pressure, temperature, liquid mass fraction, flow rate and heat dissipation distributions under different geometric, operating, slip and no-slip boundary conditions are systemically exhibited and analyzed. The results show that with the rise of eccentricity or length diameter ratio, the maximum peaks of pressure, temperature and heat dissipation are rapidly increased, the cavitation is aggravated, and the flow rate is accelerated in different extent. As the bearing speed accelerating, the maximum peak of temperature is strongly increased, whereas, the distinction between peaks of flow rate and heat dissipation is magnified and reduced, respectively. It provides a fruitful inside view of the inner flow and thermal characterizations of HJB for further understanding its flow-thermal interaction mechanisms and offers theoretical support for improving its working performance.

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Section: Introductionmentioning

confidence: 99%

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Jiang

Liang²,

Huang³

et al. 2021

Micromachines

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“…Bang et al [16] performed an experimental work to compare leading edge groove TPJB with conventional journal bearings under different running conditions. Thorat et al [17] measured the bearing metal temperatures of TPJB with the configuration of five-pad and load-between-pad (LBP). Temperature was measured at the two loaded bottom pads and thermal behavior was predicted by TEHD lubrication model.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Boundary Condition on Tilting Pad Journal Bearing Behavior

2020

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This research presents the effect of the thermal boundary condition on the tilting pad journal bearing characteristics. The thermal boundary condition includes the temperature around the bearing pad, spinning journal, and lubricant supply temperature. Change in bearing performance according to the temperature around each element constituting the bearing was analyzed without paying attention to how the actual thermal boundary conditions around the bearing are configured. High fidelity numerical model of tilting pad journal bearing is presented for (1) the analysis of heat generation in the thin film, (2) heat transfer in the lubricant, (3) heat flux flowing into the journal and pad, (4) temperature change in the journal and bearing, (5) the resultant thermal deformation, (6) change in the lubricant film thickness arising from the thermal deformation of journal and bearing pads, and (7) the resulting change in the heat generation in the thin film. To reach the steady state of the bearing–journal system, the Runge–Kutta scheme with adaptive time step is adopted where the dynamic and thermal system are solved simultaneously in multi-physics model. Performance change of the bearing according to three changes: (a) boundary temperature around shaft, (b) boundary temperature around bearing pads, and (c) lubricant supply temperature were investigated.

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“…Daniel and Cavalca in [5] investigated the thermal effects of tilting-pad bearings by using THD analysis and a finite-volume method for the integration of the energy equation. Thorat et al in [6] compared pad temperature measurements with predictions using a TEHD model by investigating the effects of manufacturing tolerances on bearing assembled clearance and preload. The state of art of thermal models for tilting-pad journal bearings is represented by the work of Suh and Palazzolo in [7], where they developed a full three-dimensional thermal model by including pad thermal deformation, shaft thermal expansion and pivot flexibility, and by the work of Rindi et al in [8], in which they improved the three-dimensional thermal model by including the model of the oil supply.…”

Section: Introductionmentioning

confidence: 99%

Cooled Pads for Tilting-Pad Journal Bearings

et al. 2019

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Tilting-pad journal bearings (TPJBs) are widely installed in rotating machines owing to their high stability, but some drawbacks can be noted, such as higher cost with respect to cylindrical journal bearings and thermal issues. High temperatures in the pads correspond to low oil-film thicknesses and large thermal deformations in the pads. Therefore, the restriction of the maximum temperature of the bearing is a key aspect for oil-film bearings. The temperature reduction is generally obtained by adopting higher oil inlet flowrates or suitable oil nozzles. In this paper, the idea of using cooled pads with internal channels in which an external cooling fluid is circulated will be applied to a TPJB for the first time. The three-dimensional TEHD model of the TPJB, equipped with a cooled pad, will be introduced, and the results of the numerical simulations will be discussed. Several analyses have been performed in order to investigate the influence of cooling conditions, such as the type, flowrate, inlet temperature and number of cooled pads. Two types of pad geometry with different cross-sections of the cooling circuit, namely, circular and six-square multi-channel sections, have been compared to the reference bearing with solid pads. Simple experimental tests were performed by means of a test rig equipped with a cooled pad bearing obtained with the additive manufacturing process, thus showing the effectiveness of the solution and the agreement with the predictions.

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Metal Temperature Correlations in Tilting Pad Journal Bearings

Cited by 7 publications

References 3 publications

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Effect of Thermal Boundary Condition on Tilting Pad Journal Bearing Behavior

Cooled Pads for Tilting-Pad Journal Bearings

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