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

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.

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The Numerical Simulation Research of Gas Entrainment Based on Three-Dimensional Model

Volume 8: Computational Fluid Dynamics (CFD) and Coupled Codes; Nuclear Education, Public Acceptance and Related Issues ◽

10.1115/icone25-66725 ◽

2017 ◽

Author(s):

Yilin Zhang ◽

Shanfang Huang

Keyword(s):

Experimental Data ◽

Mass Flow Rate ◽

Cross Section ◽

Flow Rate ◽

Three Dimensional ◽

Two Dimensional ◽

Dimensional Model ◽

Three Dimensional Model ◽

Gas Entrainment ◽

Simulation Results

Two kinds of three-dimensional model are built to simulate the gas entrainment process through a small break in the horizontal coolant pipe at the bottom of the stratified flow. The results were compared with the two-dimensional simulation results and the experimental data. In terms of the two-phase distribution, the simulation results agree well with the experimental data and show much superiority compared with the two-dimensional model. The results verify the reliability of model building, condition setting and calculating method qualitatively and quantitatively. In general, after gas entrainment, the average velocity over cross section increases obviously, but the mass flow rate decreases contrarily. This is because that void fraction meanwhile reduces the fluid density. In addition, it is found that the larger the void fraction of vapor is, the higher the average discharge velocity of the fracture cross-section fluid is. Besides, with the larger internal and external pressure difference, the gas volume fraction and the flow velocity in the break increase, resulting in the mass flow rate increasing along with them. However, since the critical height increases as well, the total loss amount of liquid in the stable effluent stage decreases, and the time before entrainment becomes shorter.

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The Fitting Formula of Outflow Coefficient for the V-Cone Flow Meter Based on FLUENT

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.16-19.1199 ◽

2009 ◽

Vol 16-19 ◽

pp. 1199-1202

Author(s):

De Zhi Sun ◽

Xiao Ying Chen ◽

Wei Li Liu

Keyword(s):

Cone Angle ◽

Three Dimensional ◽

Effective Diameter ◽

Dimensional Model ◽

Three Dimensional Model ◽

Flow Meter ◽

Technical Parameters ◽

Fluent Software ◽

Computational Fluid Dynamics Cfd ◽

High Temperature Steam

The V-cone flow meter is widely used to measure gas, liquid and high temperature steam in current industrial production. By applying the FLUENT software of CFD, a three-dimensional model about the V-cone flow meter is built. The effect of technical parameters on flow in the V-cone flow meter field has been studied by using computational fluid dynamics (CFD). The data fitting for empirical formula of the outflow coefficient was completed by using MATLAB software to provide some basis for the further production and exploration. The simulation outflow coefficient is relevant to the parameter of the effective diameter ratio , the diameter of pipe D, front-cone angle and back-cone angle .

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Construction project of a long reach compact excavator

Journal of Mechanical and Energy Engineering ◽

10.30464/jmee.2020.4.4.341 ◽

2021 ◽

Vol 4 (4) ◽

pp. 341-356

Author(s):

Grzegorz Chomka ◽

Michał Kondaszewski

Keyword(s):

Construction Project ◽

Three Dimensional ◽

Optimal Solution ◽

Operating Conditions ◽

Technical Documentation ◽

The Finite Element Method ◽

Dimensional Model ◽

Operational Parameters ◽

Three Dimensional Model ◽

Standard Operating

The purpose of thesis was to comprehensively develop the construction project of a long reach compact excavator. Optimal solution was selected and its frames were determined by carrying out classic structural calculations. Then, based on them, a preliminary three-dimensional model was designed in the CAD environment. The prototype was subjected to a series of verification calculations and simulation tests using the finite element method under typical, but also non-standard operating conditions. Then, the structure was optimized and then tested again. Next, technical documentation of the final version was created. In the final part of work, technical and operational parameters of designed compact excavator were summarized and the direction of further actions was determined. The thesis ended with a summary of the observations arose during its implementation.

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