3-D thermohydrodynamic analysis of textured, grooved, pocketed and hydrophobic pivoted-pad thrust bearings

Zouzoulas, Vassilios; Papadopoulos, Christos I.

doi:10.1016/j.triboint.2016.10.001

Cited by 53 publications

(44 citation statements)

References 30 publications

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“…However, in particular the results for friction torque and maximum pressure are remarkably close to the much more time consuming CFD simulation. In fact, the CFD simulation took approximately 64 h for each pad design according to the authors [23]. Hence, the present model is roughly three orders of magnitude faster than a comparable CFD study.…”

Section: Comparison With Cfd Resultsmentioning

confidence: 96%

“…To assess the accuracy of the present model, simulations are performed for the tilting pad thrust bearing investigated through CFD by Zouzoulas and Papadopoulos [23]. Results are compared for the bearing performance characteristics considered most important, namely minimum film thickness, friction torque per pad, maximum temperature and maximum pressure.…”

Section: Comparison With Cfd Resultsmentioning

confidence: 99%

“…T inlet is the lubricant temperature at the pad inlet, which is calculated considering the hot-oil-carry-over-effect [22,23], where it is assumed that the oil entering a particular pad is a mixture of cold oil from the oil supply and hot oil transported over from the preceding pad:…”

Section: Thermal Effectsmentioning

confidence: 99%

“…All numerical experiments are conducted on the point-pivoted tilting pad thrust bearing investigated in Refs. [22,23]. Geometrical details and considered operating conditions are given in Table 1.…”

Section: Numerical Experimentsmentioning

confidence: 99%

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Numerical analysis and optimization of surface textures for a tilting pad thrust bearing

Gropper

Harvey

Wang

2018

Tribology International

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A B S T R A C TA numerical model based on the Reynolds equation to study textured tilting pad thrust bearings considering massconserving cavitation and thermal effects is presented. A non-uniform and adaptive finite volume method is utilized and two methods are compared and selected regarding their efficiency in handling discontinuities; specifically placing additional nodes closely around discontinuities and directly incorporating discontinuities in the discrete system. Multithreading is applied to improve the computational performance and three root-finding methods to evaluate the bearing equilibrium are compared; namely Newton-Raphson method, Broyden's method with Sherman-Morrison formula and a continuation approach with fourth-order Runge-Kutta method. Results from the equivalent untextured bearing are utilized to accelerate the computation of the textured bearing and results are validated by comparison with CFD data.

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Section: Comparison With Cfd Resultsmentioning

confidence: 96%

Section: Comparison With Cfd Resultsmentioning

confidence: 99%

Section: Thermal Effectsmentioning

confidence: 99%

Section: Numerical Experimentsmentioning

confidence: 99%

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Numerical analysis and optimization of surface textures for a tilting pad thrust bearing

Gropper

Harvey

Wang

2018

Tribology International

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“…As current technology has enabled the accurate manufacturing of such micro-scale patterns, contemporary research on the performance of textured bearings is growing more intense, with the optimization of texture geometry and placement being attempted by several researchers [5][6][7][8]. Apart from research aiming at identifying the potential of surface texturing to fixed pad thrust bearings, relevant studies on pivoted-pad thrust bearings have also been reported [26][27][28][29][30], showcasing substantial performance improvements in terms of increased load carrying capacity and reduced Turbochargers operate at high rotational speeds, with maxima typically well over 200 kRPM.…”

mentioning

confidence: 99%

Design Optimization of an Automotive Turbocharger Thrust Bearing Using a CFD-Based THD Computational Approach

et al. 2018

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In a quest to reduce fuel consumption and emissions of automotive combustion engines, friction losses from many different sources need to be minimized. For modern designs of turbochargers commonly used in the automotive industry, reduction of friction losses results in better efficiency and also contributes to a faster transient response. The thrust bearing is one of the main contributors to the mechanical losses of a turbocharger. Therefore, it is crucial to optimize the design of the thrust bearing so that it has minimum friction losses while keeping sufficient thrust carrying capacity. One of the main challenges of turbocharger thrust bearing design, is that rotation speed is not fixed: the turbocharger may have a rotation speed which varies between 0 to as much as 250 kRPM. Moreover, the thrust bearing generates considerable heat, which changes the temperature of the oil film and its surroundings. In the present work, the design of the thrust bearing of an automotive turbocharger has been optimized. A CFD-based Thermohydrodynamic (THD) computational approach has been developed, taking into consideration heat dissipation, conjugate heat transfer throughout the bearing domain including the surrounding parts, as well as shear thinning and cavitation in the lubricant domain. An optimizer has been coupled to the CFD solver, with the aim of identifying bearing designs with reduced friction losses. Two bearing concepts have been evaluated: a taper-land design-which is a commonly applied thrust bearing concept-as well as a pocket bearing design. The resulting optimum pocket designs exhibit improved performance, in comparison to the optimum taper-land design. The present results indicate that (a) the pocket design concept can substantially contribute to further reducing the friction losses of a turbocharger, and (b) optimal design parameters of pocket bearings depend on the specific application (size, operating conditions), therefore detailed calculations should be performed to verify optimum performance.

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Simulation-Based Analysis of Performance Parameters of Thrust Pad Bearing Under Thin Film Lubrication with Chamfered Inlet

Kumari

Azam

2020

Lecture Notes in Mechanical Engineering

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3-D thermohydrodynamic analysis of textured, grooved, pocketed and hydrophobic pivoted-pad thrust bearings

Cited by 53 publications

References 30 publications

Numerical analysis and optimization of surface textures for a tilting pad thrust bearing

Numerical analysis and optimization of surface textures for a tilting pad thrust bearing

Design Optimization of an Automotive Turbocharger Thrust Bearing Using a CFD-Based THD Computational Approach

Simulation-Based Analysis of Performance Parameters of Thrust Pad Bearing Under Thin Film Lubrication with Chamfered Inlet

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