The Theoretical Flow Ripple of an External Gear Pump

2003 ◽  
Vol 125 (3) ◽  
pp. 396-404 ◽  
Author(s):  
Noah D. Manring ◽  
Suresh B. Kasaragadda
Keyword(s):  
Control Volume ◽  
Gear Pump ◽  
Flow Ripple ◽  
Gear Mesh ◽  
Harmonic Frequencies ◽  
Fast Fourier Transform Analysis ◽  
Number Of Teeth ◽  
The Difference ◽  
Closed Form Approximation ◽  
External Gear Pump

In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. In this work, the flow ripple equation is derived based upon the flow of incompressible fluid across the changing boundaries of a control volume. From this method, it is shown that the instantaneous length of action within the gear mesh determines the instantaneous flow ripple. A numerical and a closed-form approximation are presented for the instantaneous length of action and it is shown that the difference between these two solutions is negligible. Fast Fourier transform analysis is employed for identifying the harmonic frequencies and amplitudes of the flow pulse and these results are compared for 16 different pump designs. In summary, the results of this study show that the driving gear dictates the flow ripple characteristics of the pump while the driven gear dictates the pump size. As a result, it may be advantageous to design an external gear pump with a large number of teeth on the driving gear and a fewer number of teeth on the driven gear. This design configuration will tend to reduce both the physical pump size (without reducing the volumetric displacement of the pump) and the amplitude of the flow pulsation, while increasing the natural harmonic frequencies of the machine.

The Theoretical Flow Ripple of an External Gear Pump

2002 ◽  
Author(s):  
Noah D. Manring ◽  
Suresh D. Kasaragadda
Keyword(s):  
Incompressible Fluid ◽  
Numerical Solution ◽  
Control Volume ◽  
Gear Pump ◽  
Flow Pulsation ◽  
Flow Ripple ◽  
Instantaneous Flow ◽  
Gear Mesh ◽  
Number Of Teeth ◽  
External Gear Pump

In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. In this work, the flow ripple equation is derived based upon the flow of incompressible fluid across the changing boundaries of a control volume. From this method, it is shown that the instantaneous length of action within the gear mesh determines the instantaneous flow ripple. Using a numerical solution for the instantaneous length of action, different pump designs are compared. In summary, the results of this study show that it may be advantageous to design an external gear pump with a large number of teeth on the driving gear and a fewer number of teeth on the driven gear. This design configuration will tend to reduce both the physical pump size (without reducing the volumetric displacement of the pump) and the amplitude of the flow pulsation, while increasing the natural harmonic frequencies of the machine.

The Flow Pulsation Analysis of an External Gear Pump

2011 ◽  
Vol 236-238 ◽  
pp. 2327-2331
Author(s):  
Yan Zhi Li ◽  
Li Huan Gao ◽  
Xiao Yang Tang
Keyword(s):  
Pulse Amplitude ◽  
Gear Pump ◽  
Flow Pulsation ◽  
Flow Ripple ◽  
Pump Flow ◽  
External Gear Pumps ◽  
Tooth Width ◽  
Different Types ◽  
Gear Pumps ◽  
External Gear Pump

In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. External gear pumps with three different types of tooth profiles are studied. Nondimensional flowrates and fluctuation coefficients of gear pumps are discussed. By using the formula, flowrates can be calculated accurately and efficiently. Results indicate that: in the case of the same displacement (except teeth number and tooth width, other parameters of the gear pump are the same) the gear pump flow pulsation decreases with the increasing of the teeth number. We also concluded that changing tooth profiles on the driving and driven gear can get different pulse amplitude of the flow ripple.

scholarly journals A Numerical Analysis of an Innovative Flow Ripple Reduction Method for External Gear Pumps

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 471
Author(s):  
Gianluca Marinaro ◽  
Emma Frosina ◽  
Adolfo Senatore
Keyword(s):  
Reverse Flow ◽  
Control Volume ◽  
Three Dimensional ◽  
Parameter Method ◽  
Gear Pump ◽  
Noise Emission ◽  
Flow Ripple ◽  
Commercial Code ◽  
Innovative Solution ◽  
Gear Pumps

In this paper, an innovative solution to minimize noise emission, acting on the flow ripple, in a prototype External Gear Pump (EGP) is presented. Firstly, a new tool capable to completely simulate this pump’s typologies, called EgeMATor, is presented; the hydraulic model, adopted for the simulation, is based on a lumped parameter method using a control volume approach. Starting from the pump drawing, thanks to different subroutines developed in different environments interconnected, it is possible to analyze an EGP. Results have been compared with the outputs of a three-dimensional CFD numerical model built up using a commercial code, already used with success by the authors. In the second section, an innovative solution to reduce the flow ripple is implemented. This technology is called Alternative Capacitive Volumes (ACV) and works by controlling and uniformizing the reverse flow, performing a consistent reduction of flow non-uniformity amplitude. In particular, a high reduction of the flow non-uniformity is notable in the frequency domain on the second fundamental frequency. The technology is easy to accommodate in a pump housing, especially for high-pressure components, and it helps with reducing the fluid-borne noise.

Numerical Simulation on the Flow Field of External Gear Pump Based on FLUENT

2014 ◽  
Vol 556-562 ◽  
pp. 1421-1425
Author(s):  
An Fu Guo ◽  
Ting Ting Jiang ◽  
Tong Wang ◽  
Yun Ping Hu ◽  
Da Jiang Zhang
Keyword(s):  
Kinetic Energy ◽  
Energy Distribution ◽  
Turbulent Kinetic Energy ◽  
Maximum Velocity ◽  
Flow Distribution ◽  
Kinetic Energy Distribution ◽  
Gear Pump ◽  
Intermediate Point ◽  
Gear Mesh ◽  
External Gear Pump

In this paper, the software FLUENT was employed and the two-dimensional flow fields of external gear pump, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the pressure of the pump presents the symmetry and the maximum static pressure is 0.127 MPa at the oil absorption cavity inlet. The maximum velocity appeared in the left side of the gear pump body reached 6.97m/s and the minimum velocity reached 1.09m/s on the two gears meshing line. Turbulence kinetic energy distribution of the pump shows the symmetry and the minimum turbulent kinetic energy appeared in the two gear mesh is 0.0312m2/s2. Meanwhile, the maximum turbulent kinetic energy reached 12.2 m2/s2 at the exit of the oil cavity. The maximum exit velocity appeared at the position of the intermediate point reached 3m/s. The results have referenced significance for design and analysis of external gear pump.

Three-dimensional model of an external gear pump with an experimental evaluation of the flow ripple

2020 ◽  
pp. 095440622093704 ◽  
Author(s):  
Alessandro Corvaglia ◽  
Alessandro Ferrari ◽  
Massimo Rundo ◽  
Oscar Vento
Keyword(s):  
Flow Rate ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Gear Pump ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Flow Meter ◽  
Flow Ripple ◽  
Delivery Pressure ◽  
External Gear Pump

A three-dimensional model of an external gear pump and a new application of an algorithm for the measurement of the unsteady flow rate in hydraulic pipes are presented. The experimental delivery flow ripple was compared with the outcomes of a simulation under different operating conditions. A comprehensive computational fluid dynamics model of the pump and of the high-pressure delivery circuit was developed in SimericsMP+®. The pump model considers the clearances, which vary according to the shaft angle, between the tip of the tooth and the inner surface of the stator, as well as between the flanks of the teeth that are in contact. The pump delivery circuit is constituted by a straight pipe with a fixed orifice at the end to generate the load. The model of the entire system was preliminarily validated in terms of delivery pressure ripple. Subsequently, the simulated flow ripple was contrasted with the instantaneous flow rate, measured by means of an innovative flow meter. It was found that the proposed flow meter is reliable in assessing the flow oscillations under the various working conditions.

External Gear Pump Model and Simulation

2011 ◽  
Vol 127 ◽  
pp. 228-232 ◽  
Author(s):  
Hui Wang ◽  
Sha Sha Du
Keyword(s):  
Simulation Analysis ◽  
Gear Pump ◽  
Structural System ◽  
Pump Design ◽  
Gear Mesh ◽  
Mesh Model ◽  
Model And Simulation ◽  
Gear Pumps ◽  
The Impact ◽  
External Gear Pump

This paper describes the development of gear pumps and the main causes of noise,and establish the overall dynamic model of external gear pump,mainly including the trapped oil model,the gear mesh model and the shell model and then go on with simulation analysis and research.Through establishment the gear pump model,it is benefit for predicting the gear pump trapped oil pressure and studying the impact of parameter changes on the pressure,and getting the natural frequencies and model shapes of the gear pump structural system,so that we can analysis external gear pump vibration and assess gear pump design optimization,while helping to find the effective measures to control gear pump noise and ease trapped oil phenomenon.

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

2021 ◽  
Vol 13 (6) ◽  
pp. 3089
Author(s):  
Miquel Torrent ◽  
Pedro Javier Gamez-Montero ◽  
Esteban Codina
Keyword(s):  
Working Conditions ◽  
Test Bench ◽  
Fluid Dynamic ◽  
Graph Model ◽  
Field Tests ◽  
Black Box ◽  
Gear Pump ◽  
Volumetric Behavior ◽  
External Gear Pump ◽  
Standard Tests

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.

The Research on Pure Water Hydraulic External Gear Pump

2010 ◽  
Vol 44-47 ◽  
pp. 1767-1772
Author(s):  
De Xin Zhao ◽  
Rui Bo Yuan ◽  
Jing Luo
Keyword(s):  
Surface Treatment ◽  
Structural Design ◽  
Treatment Process ◽  
Pure Water ◽  
Spare Part ◽  
Gear Pump ◽  
Calculation Of Parameters ◽  
Water Hydraulic ◽  
Engineering Materials ◽  
External Gear Pump

This article describes the structure of pure water hydraulic external gear pump, structural design and calculation of parameters,analysises the mai spare part material of pure water hydraulic external gear pump and determines the type of the new engineering materials. Besides the surface treatment process of pump are discussed. Pure water hydraulic external gear pump is simulated by FLUENT, obtaining the parameters of the influence of the pump's performance.

Computer Prediction of Cyclic Excitation Sources for an External Gear Pump

1985 ◽  
Vol 199 (3) ◽  
pp. 175-180 ◽  
Author(s):  
K Foster ◽  
R Taylor ◽  
I M Bidhendi
Keyword(s):  
Computer Program ◽  
Gear Pump ◽  
Computer Prediction ◽  
Pressure Distributions ◽  
External Gear Pumps ◽  
Theoretical Predictions ◽  
Gear Pumps ◽  
External Gear Pump

A description is given of a computer program for investigating the performance of the external gear pumps under varying conditions with the special emphasis on the examination of pressure distributions within the pump, i.e. excitation forces for the vibration of the pump case and the variation in flow generated by the pump. Measurements are presented for the variation with time of tooth space pressure and the results are compared with the theoretical predictions from the computer program.

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