Experimental investigation of lubrication and cooling effects of high-speed rotating machines

Tzeng, Sheng‐Chung; Ma, Weiping; Lin, Chu-Wei; Jywe, Wen-Yuh; Liu, Chien-Hung; Wang, Yan-Chan

doi:10.1007/s00170-007-1175-9

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…It was also noted by Mohanty et al [12] that the heat transfer is higher for rotational convection than it is for pure cross-flow. This view is somewhat contradicted by Tzeng et al [13] who found that at higher Reynolds numbers the cooling efficiency was increased on high-velocity rotating machines.…”

Section: Introductionmentioning

confidence: 86%

Constructal multiscale cylinders rotating in cross-flow

Bello‐Ochende

Meyer

Ogunronbi

2011

International Journal of Heat and Mass Transfer

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a b s t r a c tThis work describes the effect of steady-state laminar forced convection on multiscale rotating cylinders in cross-flow. The objective was to numerically maximise the heat-transfer-rate-density from the multiscale cylinder assembly under a prescribed pressure drop. Two main configurations were studied, the first was with two different-sized cylinders aligned along the same centreline, and the second configuration was that in which the axis of rotation of the two cylinders was not on the same centreline but the leading edges of the cylinders were on the same line. In both configurations, the cylinders were subjected to two types of rotations, counter-rotation and co-rotation. Numerical solutions for stationary and rotational cylinders were solved to determine the optimum cylinder diameter, spacing and the corresponding maximum heat transfer rate density. The effects of different centres of rotation and the dimensionless pressure drop on the cylinder-to-cylinder spacing, optimal diameter of the cylinder and the maximum heat transfer rate density were reported. Results show that the optimal smaller cylinder diameter was robust with respect to the dimensionless pressure drop number, for both configurations. Results further showed that rotation was only beneficial for cylinders with the same axis of rotation and the effect was minimal when the axis of rotation is different.

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Section: Introductionmentioning

confidence: 86%

Constructal multiscale cylinders rotating in cross-flow

Bello‐Ochende

Meyer

Ogunronbi

2011

International Journal of Heat and Mass Transfer

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“…In recent years, studies of EHL have mainly focused on theoretical model research and testing technology. Some scholars have studied on lubrication characteristics of high-speed rotating machines in theory or experimental techniques [10,11]. Yang and Wen [12] proposed a generalized Reynolds equation for a non-Newtonian thermal EHL.…”

Section: Introductionmentioning

confidence: 99%

Thermal EHL Characteristics Investigation on Axle Box Bearings of Railway Vehicle Based on Slicing Method

Huo

Zhou²,

et al. 2019

Shock and Vibration

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Lubrication failures of axle box bearings can lead to accidents, such as bearing burnout and hot axle cutting. Presently, the modeling of the vehicle-track system dynamics rarely considers the nonlinear contact load of axle box bearings, and this leads to imperfection in the vehicle-track system dynamics calculation. And then, the load distribution and lubrication characteristics of axle box bearings are difficult to obtain. Therefore, in this paper, we fully consider the time-varying nonlinear contact load of bearings and track irregularity in establishing the bearing-wheel-rail system coupling-dynamics model. The dynamic response of axle box bearings is obtained by taking the vertical, strong impact-time-varying load on the carrying saddles as the external excitation. The load-balance equation of dynamic pressure lubrication is then obtained, according to the slicing method of bearing rollers. Finally, the elastohydrodynamic lubrication (EHL) model of axle box bearings is established considering thermal and scale effects. The results show that the central film thickness under thermal EHL was decreased by 13.61% compared with that under isothermal EHL. As the velocity of the contact pair increases, the thickness difference between thermal and isothermal EHL became larger. Thermal effects should be considered in the EHL model, in order to truly reflect the characteristics of EHL under a high speed.

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“…They showed particularly that the smooth gap is more favorable to heat transfer by convection along the rotor wall. It has been confirmed by Tzeng et al [5], who considered the heat transfer in rotor-stator cavities with or without ribs. They reported that the 4-rib case provides the best overall cooling performance, showing a 20-40% removal of heat in comparison to that of the smooth wall.…”

Section: Introductionmentioning

confidence: 73%

Numerical Modeling of Heat Transfer in Taylor-Couette-Poiseuille Systems

Hamidi

Rezoug

Poncet

2019

DDF

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The purpose of this work is to model turbulent Taylor-Couette-Poiseuille flows submitted to a temperature gradient. These flows are relevant in many industrial applications including rotating machineries and more especially for the effective cooling of electric motors. Several turbulence closures (k-ω SST, RSM and LES) are first compared in the isothermal case and validated against the reliable experimental data of Escudier and Gouldson [1]. A detailed analysis of the coherent structures within the boundary layers is proposed. The model offering the best compromise between computational cost and accuracy is then used to perform more computations in the configuration with a temperature gradient considered by Kuosa et al. [2]. In their system, the air flow enters the rotor-stator cavity radially. Correlations for the average Nusselt numbers along the rotor and stator as a function of the control parameters (rotation rate, air flow rate, Prandtl number) are provided and compared with data available in the literature [3].

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Experimental investigation of lubrication and cooling effects of high-speed rotating machines

Cited by 13 publications

References 11 publications

Constructal multiscale cylinders rotating in cross-flow

Constructal multiscale cylinders rotating in cross-flow

Thermal EHL Characteristics Investigation on Axle Box Bearings of Railway Vehicle Based on Slicing Method

Numerical Modeling of Heat Transfer in Taylor-Couette-Poiseuille Systems

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