A CFD study of an Electronic Hydraulic Power Steering Helical External Gear Pump: Model Development, Validation and Application

Qi, Feng; Dhar, Sujan; Nichani, Varun; Srinivasan, Chiranth; Wang, De Ming; Liu, Yang; Bing, Zhonghui; Yang, Jinming Jim

doi:10.4271/2016-01-1376

Cited by 27 publications

(26 citation statements)

References 10 publications

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“…The CFD software PumpLinx was developed specifically for the 3D simulation of pumps. Some recent examples of studies on positive displacement machines can be found in the references [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Filling Capability in Vane Pumps

2019

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In positive displacement pumps, the main volumetric loss at high speed is due to the incomplete filling of the variable volume chambers. The prediction of the limit speed and of the maximum flow rate delivered by a pump can be obtained only through Computational Fluid Dynamics (CFD) simulations, since the shape, the orientation, and the movement of the chambers with respect to the inlet volume must be considered, along with the non-uniform distribution of the gaseous phase, due to the dissolved air release. In this paper, the influence of different geometric parameters on the filling of a vane pump has been investigated through the commercial software PumpLinx®. At first, a model of a reference pump has been created and validated with different configurations of the suction flow area, then a simplified model has been used for assessing the influence of the geometry of the rotating assembly. It was found that a pump with a low ratio between the axial thickness and the diameter has a higher volumetric efficiency if the chambers are fed from one side only. Opposite behaviors were found in the case of pumps with small diameters and high thicknesses. Moreover, the filling could be improved by increasing the number of chambers, and by reducing the diameter of the rotor, even only locally.

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Section: Introductionmentioning

confidence: 99%

Simulation of the Filling Capability in Vane Pumps

2019

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“…In general, gear machines are used as low-cost fixed displacement units for simple applications, above all in mobile hydraulics [1]. Some examples in automotive systems include lubricating pumps for internal combustion engines [2], fuel pumps [3], hydraulic power units for automatic [4], dual-clutch [5] and all-wheel-drive transmissions [6], pumps for steering units [7] and for exhaust gas after-treatment applications [8]. In the aeronautical field they are used for the lubrication of helicopter gearboxes [9] and aircraft gas turbine engines [10,11].…”

Section: Introductionmentioning

confidence: 99%

Models for Flow Rate Simulation in Gear Pumps: A Review

Rundo

2017

Energies

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Gear pumps represent the majority of the fixed displacement machines used for flow generation in fluid power systems. In this context, the paper presents a review of the different methodologies used in the last years for the simulation of the flow rates generated by gerotor, external gear and crescent pumps. As far as the lumped parameter models are concerned, different ways of selecting the control volumes into which the pump is split are analyzed and the main governing equations are presented. The principles and the applications of distributed models from 1D to 3D are reported. A specific section is dedicated to the methods for the evaluation of the necessary geometric quantities: analytic, numerical and Computer-Aided Design (CAD)-based. The more recent studies taking into account the influence on leakages of the interactions between the fluid and the mechanical parts are explained. Finally the models for the simulation of the fluid aeration are described. The review brings to evidence the increasing effort for improving the simulation models used for the design and the optimization of the gear machines.

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“…Substitute Equations (15) and (16) into Equation 17, yields Figure 16b shows the drop of mean flowrate for a reference pump with respect to the change of (CR p − 1)η.…”

Section: Analytical Expression Of the Kinematic Flowrate Given By Thementioning

confidence: 99%

“…The analytical results of the kinematic ripple source presented in this section (by substituting Equations (7), (13) and (15) into Equation (6)) can be written in the form of Fourier Cosine Series. After that, the transfer function of Equation (25) can be super-imposed to yield the resulting delivery flow ripple under different loading level.…”

Section: : Crmentioning

confidence: 99%

“…Specifically, on the simulation of EGPs delivery flow, during the last decade there has been extensive research effort, on both CFD-based approaches as well as lumped parameter dynamic models. As pertains to CFD approaches, significant are the works by Yoon et al [14], which performed a full CFD analysis for a spur EGP using immersed boundary method with the commercial software CFX; Qi et al [15] simulated a helical EGP with the commercial software Simerics MP+, Castilla et al published several studies on 3D CFD model for EGP pumps developed based on opensource library OpenFOAM [16,17]. The most significant works on dynamic lumped parameter models are represented by the contributions by Vacca and Guidetti [18], Mucchi et al [19] and their subsequent works [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Investigation into the Ripple Source of External Gear Pumps

Zhao

Vacca

2019

Energies

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External gear pumps are among the most popular fluid power positive displacement pumps, however they often suffer of excessive flow pulsation transmitted to the downstream circuit. To meet the increasing demand of quiet operation for modern fluid power system, a better understanding of the ripple source of gear pumps is desirable. This paper presents a novel approach for the analysis of the ripple source of gear pumps based on decomposition into a kinematic component and a pressurization component. The pump ripple can be regarded as the superposition of the displacement solution and the pressurization solution. The displacement solution is driven by the kinematic flow, and it can be derived from the kinematic flow theory; instead, the pressurization solution can be approximated by overlapping the pressurization flow for a single displacement chamber. Furthermore, in this way the changes of these two components with modification of the delivery circuit are determined in both analytical and numerical ways. The result of this analysis provides a good interpretation of the pulsation simulated by a detailed lumped-parameter simulation model, thus showing its validity. The result also indicates that the response of two ripple sources to the change of the loading in the downstream hydraulic circuit is very different. These findings reveal the limitation of the traditional experimental method for determining the pump ripple, that new experimental methods which are more physics-based can be potentially formulated based on this work.

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A CFD study of an Electronic Hydraulic Power Steering Helical External Gear Pump: Model Development, Validation and Application

Cited by 27 publications

References 10 publications

Simulation of the Filling Capability in Vane Pumps

Simulation of the Filling Capability in Vane Pumps

Models for Flow Rate Simulation in Gear Pumps: A Review

Theoretical Investigation into the Ripple Source of External Gear Pumps

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