CFD Model of an External Gear Pump

Jędraszczyk, Paulina; Fiebig, Wiesław

doi:10.1007/978-3-319-50938-9_23

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…The general form of the continuity equation for compressible fluid is: The literature review shows that channels in the first two groups are rarely modeled in numerical studies [28]. On the other hand, modeling the discharge channels is mandatory in 3D computational models.…”

Section: Theoretical Background Of the Cfd Modelmentioning

confidence: 99%

“…Although fewer in number, there is research and development related to increasing the high-pressure performance of external gear pumps, which use numerical fluid-structural analysis [24][25][26]. This has led to another part of research aimed at the influence of the trapped volume, inter-teeth pressure, and force distribution on the main (operating) characteristics [27][28][29][30][31]. A separate group of studies is oriented to cavitation phenomena, especially in the meshed zone of gears [6,22,26,[32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…This motivated the authors to create such a model using widespread universal software and describe the steps of its creation. Furthermore, in a large part of studies [4,19,23,24,27,28], the geometry is assumed to be known, for example, by the manufacturer. In contrast, in this particular study, it was obtained by measuring and depicting with a digital microscope.…”

Section: Introductionmentioning

confidence: 99%

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CFD Modeling and Experimental Validation of the Flow Processes of an External Gear Pump

Mitov,

Nikolov,

Nedelchev

et al. 2024

Processes

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This article presents computational fluid dynamics (CFD) modeling of the flow processes at a certain specimen of an external gear pump. The purpose of the developed two-dimensional (2D) CFD model is to carry out a numerical study to obtain the main characteristics of the pump flow rate, especially the flow rate as a function of the pressure and the flow rate as a function of the time. A numerical study was carried out at forty-two different operating modes that were expressed as a variation of two parameters: rotational frequency (950–1450 min−1) and pressure (5–150 bar). The validation of the numerical results was carried out through an experimental study. For this purpose, a laboratory experimental setup equipped with a modern data acquisition (DAQ) system was designed and implemented. It allows the gear pump to be tested at the same operating modes as the numerical study. A validation analysis was performed by comparing the numerical and experimental results using the average relative error index (FIT). A detailed description of the 2D CFD model development (CAD model, mesh, general settings, boundary conditions, etc.) is provided. Based on the 2D CFD model, an original methodology was proposed to take into account the influence of the discharge channels on the displacement volume of the pump by adjusting the face width of the gears. Despite the limitations of the simple 2D CFD model, which are discussed in this article, a very good match between numerical and experimental results is analyzed by calculating the FIT level, which is in the range of 93–97%.

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Section: Theoretical Background Of the Cfd Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD Modeling and Experimental Validation of the Flow Processes of an External Gear Pump

Mitov,

Nikolov,

Nedelchev

et al. 2024

Processes

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“…It has been used to determine the effect of the pump's operating parameters on the intensity of cavitation. The results were presented in a publication [19]. As well as its many advantages, the "immersed solid" technique also has some limitations which may affect the results.…”

Section: Cfd Model Of An External Gear Pumpmentioning

confidence: 99%

The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps

Szwemin

Fiebig

2021

Energies

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The design of gear pumps and motors is focused on more efficient units which are possible to achieve using advanced numerical simulation techniques. The flow that appears inside the gear pump is very complex, despite the simple design of the pump itself. The identification of fluid flow phenomena in areas inside the pump, considering the entire range of operating parameters, is a major challenge. This paper presents the results of simulation studies of leakages in axial and radial gaps in an external gear pump carried out for different gap shapes and sizes, as well as various operating parameters. To investigate the processes that affect pump efficiency and visualize the fluid flow phenomena during the pump’s operation, a CFD model was built. It allows for a detailed analysis of the impact of the gears’ eccentricity on leakages and pressure build-up on the circumference. Performed simulations made it possible to indicate the relationship between leakages resulting from the axial and radial gap, which has not been presented so far. To verify the CFD model, experimental investigations on the volumetric efficiency of the external gear pump were carried out. Good convergence of results was obtained; therefore, the presented CFD model is a universal tool in the study of flow inside external gear pumps.

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“…Castillia et al (2010) simulated the contact point between the teeth with a wall, whereas Frosina et al (2017) replaced the contact with a minimum gap. In Yoon et al (2017) and Jędraszczyk and Fiebig (2017), a numerical immersed solid approach is used in a CFD computation, to analyze the effects of rotational speed and gear tip clearance on volumetric efficiency. Furthermore, several approaches have been developed over the last 10 years to minimize the issues related to mesh deformation during the computation such as numerical effort and accuracy (Gorla C. et al, 2014;Concli F. et al, 2017;Mastrone M.N.…”

Section: Introductionmentioning

confidence: 99%

Integrated CFD-FEM approach for external gear pump vibroacoustic field prediction

Ferrari,

Morselli,

Miccoli

et al. 2024

Front. Mech. Eng.

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In this work, a three-dimensional fluid-structural and vibro-acoustics coupled model of a gear pump is presented. Gear pumps represent the majority of the positive displacement machines used for flow generation in fluid power systems. Typically, the dynamics of gear pumps are dependent on the characteristics of the fluid dynamics inside the pump, which translates into vibrations to the housing. These vibrations then propagate to the surrounding medium and emit sound. The purpose of this study is to propose a three-dimensional fully integrated computational model to simulate the complete gear pump behaviour from the fluid dynamics to the structural vibrations, up to the vibroacoustic response. In this hybrid configuration, a transient CFD (Computational Fluid Dynamics) model is first developed to simulate the 3D flow field with a deforming and re-meshing approach to take into account the variation of the volume between the gears. Second, the internal pressure field calculated at each time step is then used as a loading into a structural FEM (Finite Element Method) model of the gear pump to compute the actual stresses and deformations of the housing. Third, the results of the structural response are used as excitation in a vibroacoustic sub-model to simulate the radiated noise using a high-order FEM technique. The comparison between the numerical and experimental flow curves validates the CFD model. The sound power calculations from the vibroacoustic model show good comparison with the sound intensity measurements around the pump casing, confirming the validity of the proposed coupled model. The described CFD-FEM approach proves to be a powerful gear pump design tool: it provides a reliable estimate of gear pump working parameters such as fluid power and vibroacoustic characteristics, starting from the CAD (Computer-Aided Design) geometry of the components. Furthermore, being one of the first multi-domain simulation models of a gear pump, this work can be useful to researchers as a starting point to correlate the noise emitted with the internal flow in full 3D conditions.

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CFD Model of an External Gear Pump

Cited by 7 publications

References 3 publications

CFD Modeling and Experimental Validation of the Flow Processes of an External Gear Pump

CFD Modeling and Experimental Validation of the Flow Processes of an External Gear Pump

The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps

Integrated CFD-FEM approach for external gear pump vibroacoustic field prediction

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