The Experts below are selected from a list of 66 Experts worldwide ranked by ideXlab platform
Massimo Milani - One of the best experts on this subject based on the ideXlab platform.
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About the Influence of Eco-Friendly Fluids on the Performance of an External Gear Pump
Energies, 2021Co-Authors: Gabriele Muzzioli, Luca Montorsi, Andrea Polito, Andrea Lucchi, Alessandro Sassi, Massimo MilaniAbstract:This paper wants to investigate the effects of eco-friendly fluids on the thermo-fluid-dynamic performance of external gear Pumps in order to provide a first response to the increasingly urgent demands of the green economy. A computational fluid dynamics (CFD) approach based on the overset mesh technique was developed for the simulation of the full 3D geometry of an industrial Pump, including all the characteristic leakages between components. A sensibility analysis of the numerical model with respect to different fluid properties was performed on a commonly used mineral oil, showing the key role of the fluid compressibility on the prediction of the Pump Volumetric Efficiency. Moreover, the influence of temperature internal variations on both fluid density and viscosity were included. The BIOHYDRAN TMP 46 eco-friendly industrial oil and olive oil were further considered in this work, and the results of the simulations were compared for the three fluid configurations. A slightly lower Volumetric Efficiency was derived for the olive oil application against the other two conditions, but suggestive improvements were produced in terms of pressure and temperature distributions. Therefore, based on the obtained results, this paper encourages research activity towards the use of eco-friendly fluids in the hydraulic field.
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Variable Displacement Axial Piston Pump Volumetric Efficiency Analysis
1999Co-Authors: Giuseppe Cantore, Massimo Borghi, Massimo MilaniAbstract:This paper describes a study of the Volumetric Efficiency of a variable displacement axial piston Pump. A theoretical model, based on the continuity equation and properly combined with a simplified analytical treatment of leakage flows, is first presented and used to characterise the stationary behaviour of a 9 piston Pump for different operating conditions and different configurations. In this study attention is focused on Pump Volumetric Efficiency dependency on overall operational conditions as supply pressure, Pump speed, leakage clearance heights, swash plate angle and port plate timing. Successively, a numerical vs. experimental comparison of steady-state Pump characteristics is presented; this last part of the paper has been developed with the aim of showing the validity limits of the assumptions made to build up the numerical model. Results confirm the applicability of the simplified hypotheses introduced and validates the analysis of Volumetric Efficiency previously performed.
Xiaolin Wang - One of the best experts on this subject based on the ideXlab platform.
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Numerical investigation on screw rotor deformation and influence on Volumetric Efficiency of the twin-screw multiphase Pump
Applied Thermal Engineering, 2017Co-Authors: Xiang Yin, Feng Cao, Shengchen Pan, Yulong Song, Jiyou Fei, Xiaolin WangAbstract:The thermal and force deformation model was established to investigate the rotor deformation and its effect on the Volumetric Efficiency of the twin-screw multiphase Pump with high gas volume fractions (GVFs). Based on the ANSYS software, the deformations under different GVFs were calculated. The influence of the deformations on the clearance, the leakage flow rate and the Volumetric Efficiency was then analyzed. It was found that the largest clearance variation under the deformation was the radial clearance, followed by the circumferential clearance, and there was little change in the flank clearances. With the GVF increasing from 80% to 94%, the Pump Volumetric Efficiency increased gradually. However, it decreased sharply when the GVF exceeded 94%. Finally, the rotor clearances were analyzed and optimized, and the recommended mounting clearances were proposed, which could decrease the leakage and prevent the rotor from being stuck when large deformations occurred.
Xiang Yin - One of the best experts on this subject based on the ideXlab platform.
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Numerical investigation on screw rotor deformation and influence on Volumetric Efficiency of the twin-screw multiphase Pump
Applied Thermal Engineering, 2017Co-Authors: Xiang Yin, Feng Cao, Shengchen Pan, Yulong Song, Jiyou Fei, Xiaolin WangAbstract:The thermal and force deformation model was established to investigate the rotor deformation and its effect on the Volumetric Efficiency of the twin-screw multiphase Pump with high gas volume fractions (GVFs). Based on the ANSYS software, the deformations under different GVFs were calculated. The influence of the deformations on the clearance, the leakage flow rate and the Volumetric Efficiency was then analyzed. It was found that the largest clearance variation under the deformation was the radial clearance, followed by the circumferential clearance, and there was little change in the flank clearances. With the GVF increasing from 80% to 94%, the Pump Volumetric Efficiency increased gradually. However, it decreased sharply when the GVF exceeded 94%. Finally, the rotor clearances were analyzed and optimized, and the recommended mounting clearances were proposed, which could decrease the leakage and prevent the rotor from being stuck when large deformations occurred.
Vincent Roussel - One of the best experts on this subject based on the ideXlab platform.
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Performance investigation of reciprocating Pump running with organic fluid for organic Rankine cycle
Applied Thermal Engineering, 2017Co-Authors: Arnaud Landelle, Nicolas Tauveron, Rémi Revellin, Philippe Haberschill, Stephane Colasson, Vincent RousselAbstract:Organic Rankine cycles (ORC) are used to convert lowgrade heat sources into power. Current research and development investigate small scale and variable heat sources application such as waste heat recovery. Many experimental data on ORC are available. Feed-Pump performances achieved are lower than expected and some authors reported cavitation issue. Pump performance has a non-negligible impact over the ORC performance, especially for transcritical cycles. Operations of diaphragm Pumps in three different test benches with different fluid and Pump size are analyzed. A semi-empirical model of the Pump power chain is proposed and validated. Energetic analysis show highlevel of losses in the variable speed drive and electric motor, mainly due to design oversizing. Then a model and analysis of reciprocating Pump Volumetric Efficiency is proposed, taking into account fluid properties. Finally, cavitation limits in different conditions are calculated. Required Net Positive Suction Head (NPSHr) calculated for R134a are found to be in accordance with manufacturer limits for water. Pump vibration sensor could be used for cavitation monitoring. This work gives information for ORC feed-Pump simulation, design and operation.
Chuan Ding - One of the best experts on this subject based on the ideXlab platform.
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Research on the Volumetric Efficiency of 2D Piston Pumps with a Balanced Force
Energies, 2020Co-Authors: Yu Huang, Jian Ruan, Yong Chen, Chuan DingAbstract:Axial piston Pumps with high rotational speeds are required in many fields to increase the power-to-weight ratio. However, three main sliding friction pairs in the Pump restrict the increase in rotational speed. To solve this problem, we propose a 2D piston Pump with a balanced force that contains a sliding friction pair. Firstly, the mechanical structure and working principle of the Pump are described. Then, the Pump Volumetric Efficiency is studied by mathematical modeling, and Volumetric losses containing backflow and leakage are analyzed and discussed from the perspectives of load pressure and rotational speed. A test bench that verifies the mathematical model is built to measure the Volumetric Efficiency of the tested Pump. We have found that the increase in rotational speed can help to increase the Pump Volumetric Efficiency, and the mathematical model is consistent with the tested data for 1000 rpm but demonstrates a remarkable difference from the tested data for 3000 rpm. Thus, the temperature field of the Pump and the viscosity-temperature characteristics of the oil must be taken into account to increase Volumetric Efficiency further.
