A Thermohydrodynamic Analysis of the Self-Lubricating Bearings Applied in Gear Pumps Using Computational Fluid Dynamics Method

Mo, Jintao; Gu, Chaohua; Pan, Xiaohong; Zheng, Shilie; Gao, Ying

doi:10.1115/1.4036835

Cited by 14 publications

(11 citation statements)

References 15 publications

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“…e derivation of area V B is shown in Figure 6. e volume V Bθ occupied by the spread angle θ can be obtained by the following equation [16]:…”

Section: Graphical Methods To Solve the Minimum Trapped Oilmentioning

confidence: 99%

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Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Shan-xin

Guan²

2021

Mathematical Problems in Engineering

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The main structure of an internal gear pump consisted of an internal gear pair, including an internal gear and an external gear. The internal gear pump had oil trapping phenomenon like other hydraulic gear pumps. In order to solve the oil trapping phenomenon of involute gear pump with internal meshing tooth profile, in this paper, the mathematical equation of gear outer contour is established according to the principle of generation method, and the variation law of the trapped oil area in meshing process is deduced by theoretical instantaneous flow rate obtained by scanning method. Then, the minimum trapped oil volume and unloading area are solved by the graphic method. Finally, based on fluid mechanics and dynamics, the trapped oil pressure model is obtained. The change of the trapped oil area and trapped oil pressure in a meshing cycle is simulated by MATLAB. The results show that the trapped oil area changes in a parabola, and the trapped pressure fluctuates in mountains and valleys. When the trapped area is the smallest, the trapped oil pressure reaches the peak at the corresponding corner. The research results can provide guidance for the development of high-performance internal gear pumps.

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“…e derivation of area V B is shown in Figure 6. e volume V Bθ occupied by the spread angle θ can be obtained by the following equation [16]:…”

Section: Graphical Methods To Solve the Minimum Trapped Oilmentioning

confidence: 99%

“…From equation (16) and (17), the positions of V 10 and V 20 are shown in Figures 7 and 8, respectively. V 10 and V 20 can be obtained from (19), (20), (24), and (25).…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Shan-xin

Guan²

2021

Mathematical Problems in Engineering

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“…The water film lubrication performance was investigated, and the effects of sinusoidal waves micro-shapes were also studied. The gear pump and journal bearings were also regarded as a system in the research by Mo et al, 30,31 where they proposed the thermohydrodynamic analysis to investigate the lubrication and cooling performance of the self-circulating system. The studies indicated that the increase in the axial clearance leads to a larger leakage and a smaller temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the start behavior of rough journal bearings during the gear pump meshing cycle

Zhu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, the transient lubrication characteristics of hydrodynamic journal bearings during the external gear pump meshing cycle are studied. In the bearings lubrication calculation part, a numerical model is developed to assess the transient lubrication during the initial start-up of an aero gear pump. The model takes into account the effects of surface topography, asperities contact, and pump start-up speed. In the pump simulation part, the flow inside pump and bearing load environment are analyzed by a computational fluid dynamics model. Then a simulation method is presented to solve the problem of pump-bearings system, considering the pump’s influence during bearings lubrication calculation. To gain insight, results of a series of simulations with illustrative examples are presented. The variation of the startup lubrication performance under load conditions corresponding to the pump internal flow field is acquired. The results show that bearings operate from mixed-lubrication to hydrodynamic-lubrication state with changed load-supporting effects during the startup. The load-supporting effects and film rupture boundary are directly related to the pump load fluctuation, but the center trace is slightly influenced except on the hydrodynamic-lubrication state.

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“…Cai et al [20] analyzed the effect of the dry/wet contact in elastic/plastic materials with rough surfaces, finding the optimum layer parameters. Mo et al [21] presented a thermodynamic analysis of a self-lubricant bearing developed in Fluent ® for gear pumps, finding the whirling orbit behavior of the temperature. Regarding deformations in internal combustion engines, it was noticed the lubricant film effect needs to be addressed [22,23] because it induces changes in the free height of the piston, hence in the instantaneous volume throughout the thermodynamic cycle [5].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous in-Cylinder Volume Considering Deformation and Clearance due to Lubricating Film in Reciprocating Internal Combustion Engines

et al. 2019

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A new methodology for predicting the real instantaneous in-cylinder volume in the combustion chamber of a reciprocating internal combustion engine is implemented. The mathematical model developed as part of this methodology, takes into consideration the deformations due to pressure and inertial forces, via a deformation constant adjusted through ANSYS®, using a high-precision CAD model of a SOKAN SK-MDF300 engine. The deformation constant was obtained from the CAD model using the computational tool ANSYS® and the pressure data was obtained from the engine running at three regimes: 1500, 2500, and 3500 rpm. The results were compared with previous models reported in the literature, showing that the deformation constant obtained has a smaller variation among cycles, which leads to a more precise value of the mechanical deformations. Furthermore, to have a more accurate model of the instantaneous volume variation, a factor taking into consideration the lubricant film behavior is introduced to calculate volumetric variation due to geometrical clearances. The influence of the introduced volumetric variation was evaluated through a process of combustion diagnosis, evidencing the improvement in the predictive capacity of thermodynamic modeling and, therefore, the correct prediction of heat release rate.

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A Thermohydrodynamic Analysis of the Self-Lubricating Bearings Applied in Gear Pumps Using Computational Fluid Dynamics Method

Cited by 14 publications

References 15 publications

Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Simulation Research on Trapped Oil Pressure of Involute Internal Gear Pump

Numerical analysis on the start behavior of rough journal bearings during the gear pump meshing cycle

Instantaneous in-Cylinder Volume Considering Deformation and Clearance due to Lubricating Film in Reciprocating Internal Combustion Engines

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