CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

Casoli, Paolo; Scolari, Fabio; Rundo, Massimo; Lettini, Antonio; Rigosi, Manuel

doi:10.3390/en13215799

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…The mathematical formulation of this model is described in [11]. The equation that regulates the condensation of vapor bubbles is .…”

Section: Vapor Cavitationmentioning

confidence: 99%

“…These values were also reported in the research of Del Campo et al [10], who studied the phenomenon of gaseous cavitation in external gear pumps. These values were also adopted in a previous work [11], where the influence of cavitation on textured surfaces was studied. Generally, the vaporization coefficient is greater than the condensation one, because condensation is a process that occurs more slowly than vaporization, and this aspect is quantified with the F c and F v parameters.…”

Section: Cfd Simulationsmentioning

confidence: 99%

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Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems

2021

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Cavitation can occur at the inlet of hydraulic pumps or in hydraulic valves; this phenomenon should be always avoided because it can generate abnormal wear and noise in fluid power components. Numerical modeling of the cavitation is widely used in research, and it allows the regions where it occurs more to be predicted. For this reason, two different approaches to the study of gas and vapor cavitation were presented in this paper. In particular, a model was developed using the computational fluid dynamics (CFD) method with particular attention to the dynamic modeling of both gaseous and vapor cavitation. A further lumped parameter model was made, where the fluid density varies as the pressure decreases due to the release of air and the formation of vapor. Furthermore, the lumped parameter model highlights the need to also know the speed of sound in the vena contracta, since it is essential for the correct calculation of the mass flow during vaporization. A test bench for the study of cavitation with an orifice was set up; cavitation was induced by increasing the speed of the fluid on the restricted section thanks to a pump located downstream of the orifice. The experimental data were compared with those predicted by CFD and lumped parameter models.

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“…The mathematical formulation of this model is described in [11]. The equation that regulates the condensation of vapor bubbles is .…”

Section: Vapor Cavitationmentioning

confidence: 99%

Section: Cfd Simulationsmentioning

confidence: 99%

Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems

2021

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“…In addition, a high pressure accelerates the internal wear of the pump. In a very recent work, Casoli et al [13] analyzed the effectiveness of textured surfaces, paying special attention to the influence of introducing dimples in the lubricated couplings of hydraulic pumps. As a result, the tribological properties are improved.…”

Section: Introductionmentioning

confidence: 99%

Parameterization, Modeling, and Validation in Real Conditions of an External Gear Pump

2021

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This article presents a methodology for predicting the fluid dynamic behavior of a gear pump over its operating range. Complete pump parameterization was carried out through standard tests, and these parameters were used to create a bond graph model to simulate the behavior of the unit. This model was experimentally validated under working conditions in field tests. To carry this out, the pump was used to drive the auxiliary movements of a drilling machine, and the experimental data were compared with a simulation of the volumetric behavior under the same conditions. This paper aims to describe a method for characterizing any hydrostatic pump as a “black box” model predicting its behavior in any operating condition. The novelty of this method is based on the correspondence between the variation of the parameters and the internal changes of the unit when working in real conditions, that is, outside a test bench.

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“…Other aspects concern the optimization of power transmission [6][7][8] without neglecting the importance of the optimal match between the hydraulic system and the thermal engine [9]. Mathematical models are necessaries for evaluating different solutions, the models could be based on lumped parameters approach for the systems simulation [10][11][12][13][14][15] while when a component needs to be optimized dedicated detailed models should be developed; the literature reports research activities carried out on gear pumps [16][17][18][19][20][21]; fixed displacement gerotor pump are investigated in [22][23][24][25][26][27]. Particular applications like lubrication pump are investigated in [28][29][30]; topics concerning the condition monitoring applied to hydraulic pumps are reported in [31,32]; other papers are focused on detailed analysis of hydraulic valves [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Excavator hydraulic circuit solution to reduce dissipations and fuel consumption

et al. 2021

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In the field of mobile machine the research is mainly focused on solutions to reduce the energy dissipations and fuel consumptions being these machines mainly equipped with Diesel engines. This paper presents a solution for improving the performance of a traditional Load sensing flow sharing circuit. The solution concerns the insertion of a Load sensing signal conditioner (LSc), developed by Walvoil S.p.A., that permits to dynamically change the pressure drop across the directional valves. A careful control of this new component permits to obtain a reduction of the fuel consumption without changing the performance of the machine taking as reference a JCMAS duty cycle. This paper presents the mathematical model of a 9 ton excavator that was previously validated with tests carried out on both the single hydraulic and the excavator main components like pump and flow sharing valves. The LSc model was developed and added to the traditional hydraulic circuit. The model of the excavator hydraulic circuit with this new component has permitted to simulate the energy saving achievable in comparison with the traditional solution. The paper presents the relevance of a carefully control of this new device in order to maximize the performance. The physical prototyping of this device has been already developed and will be installed in a mobile machine to confirm the simulated performance.

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CFD Analyses of Textured Surfaces for Tribological Improvements in Hydraulic Pumps

Cited by 5 publications

References 22 publications

Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems

Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems

Parameterization, Modeling, and Validation in Real Conditions of an External Gear Pump

Excavator hydraulic circuit solution to reduce dissipations and fuel consumption

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