A new dynamic mesh algorithm for studying the 3D transient flow field of tilting pad journal bearings

Li, Mengxuan; Gu, Chaohua; Pan, Xiaohong; Zheng, Shilie; Li, Qiang

doi:10.1177/1350650116638610

Cited by 20 publications

(8 citation statements)

References 19 publications

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“…Then, the surface pressure of each pads is integrated to calculate the rotation angles of each pad in the current time step. Finally, the movement of the shaft and the rotation of each pad are completed via user defined functions (UDFs) (Li et al 2016). The dynamic grid update is completed in the current time step.…”

Section: Transient Modelmentioning

confidence: 99%

Dynamic Response Analysis of Tilting Pad Journal Bearing Considering Fluid-Structure Interaction

2021

JAFM

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The transient hydrodynamic lubrication model of tilting pad journal bearings (TPJBs) was established by the computational fluid dynamics (CFD) method and the self-developed dynamic grid program. The fluid-structure interaction between the flow field and the rotor motion, the pads rotations was realized. The feasibility of the model is proved by comparing with the experimental data. The dynamic response of TPJBs under the various unbalance, the loading modes and the rotating speeds was studied. The dynamic response of TPJBs is further analyzed through a research of the relationships among the shaft whirl orbits, transient force acting on the shaft, rotation angles of the pads and transient oil film force of the pads. With the increase of unbalance, the whirl orbits expand and whirl orbits centers rise continuously. The whirl orbits and orbit center attitude angles of TPJBs are smaller than those of fixed-pad journal bearings. Compare with the load between pads, the whirl orbits are smaller and whirl orbits centers drop slightly under the load on pads. With the increase of rotating speed, the whirl orbits expand nonlinearly, whirl orbit center rises nonlinearly. The transient force acting on the shaft, the rotation angles of the pads and the transient oil film force of the pads change periodically, and the period and frequency of these changes are the same as that of the shaft rotation. The maximum force acting on the shaft appear before the maximum shaft center position (the vertexes of the whirl orbit).

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Section: Transient Modelmentioning

confidence: 99%

Dynamic Response Analysis of Tilting Pad Journal Bearing Considering Fluid-Structure Interaction

2021

JAFM

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“…Nevertheless, there is still much room for improvement in the aspects of the versatility and robustness of TEHD models. Besides, some scholars choose to study HJB through CFD based modeling [ 17 , 18 , 19 , 20 ]. For instance, Ding et al [ 17 ] analyzed the effect of air on oil-air distribution and energy characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Hagemann et al [ 19 ] introduced a model to describe the influences of leading edge grooves on operating characteristics. Li et al [ 20 ] reported a new type of dynamic mesh algorithm based on s structured grid. However, the function of heat dissipation and slip boundary conditions were not given sufficient attention to, either.…”

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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“…However, the perturbation of velocity can lead to the increase of hydrodynamic force by damping effect, which is neglected by the simplified hydrodynamic force model (Zhang et al, 2015(Zhang et al, , 2018. By including damping properties, the linear hydrodynamic force model can be obtained (Guo et al, 2005;Li et al, 2016). Currently, this type force model is widely used in dynamic analysis of the rotor supported by water-lubricated journal bearings.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of multiple grooved water-lubricated journal bearings using attenuation rate interpolation method

Liu

Wang

et al. 2021

ILT

Self Cite

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Purpose The stringent requirements for environmental protection have induced the extensive applications of water-lubricated journal bearings in marine propulsion. The nonlinear dynamic analysis of multiple grooved water-lubricated bearings (MGWJBs) has not been fully covered so far in the literature. This study aims to conduct the nonlinear dynamic analysis of the instability for MGWJBs. Design/methodology/approach An attenuation rate interpolation method is proposed for the determination of the critical instability speed. Based on a structured mesh movement algorithm, the transient hydrodynamic force model of MGWJBs is set up. Furthermore, the parameters’ analysis of nonlinear instability for MGWJBs is conducted. The minimum water film thickness, side leakage, friction torque and power loss of friction are fully analyzed. Findings With the increase of speed, the journal orbits come across the steady state equilibrium motion, sub-harmonic motion and limit circle motion successively. At the limit circle motion stage, the orbits are much larger than that of steady state equilibrium and sub-harmonic motion. The critical instability speed increases when the spiral angle decreases or the groove angle increases. The minimum water film thickness peak is at the rotor speed of 4,000 r/min for the MGWJB with Sa = 0°. As rotor speed increases, the side leakage decreases slightly while the friction torque and the power loss of friction increase gradually. Originality/value Present research provides a beneficial reference for the dynamic mechanism analysis and design of MGWJBs.

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A new dynamic mesh algorithm for studying the 3D transient flow field of tilting pad journal bearings

Cited by 20 publications

References 19 publications

Dynamic Response Analysis of Tilting Pad Journal Bearing Considering Fluid-Structure Interaction

Dynamic Response Analysis of Tilting Pad Journal Bearing Considering Fluid-Structure Interaction

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

Nonlinear dynamic analysis of multiple grooved water-lubricated journal bearings using attenuation rate interpolation method

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