The Suction Dynamics of Positive Displacement Axial Piston Pumps

Harris, Richard; Edge, K A; Tilley, D G

doi:10.1115/1.2899221

Cited by 38 publications

(38 citation statements)

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“…The region A-B on Figure 6(b) shows a rapid rise in the gas volume fraction due to the reverse flow and insufficient supply. The reverse flow at the start of the suction phase creates a significant pressure undershoot, contributing to the rather low transient pressure in the displacement chamber (Harris et al, 1994). What is worse, the piston experiences acceleration during the initial part of the suction phase but the cylinder port has not yet been fully communicated with the valve-plate opening (Kunkis & Weber, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…First, the pressure loss is caused as the hydraulic fluid enters the cylinder block and then accelerates to the piston velocity (Manring, Mehta, Nelson, Graf, & Kuehn, 2014;Totten & Bishop, 1999). Second, the reverse flow creates a pressure undershoot in the displacement chamber as the suction stroke begins, which can make the transient pressure below the saturation pressure (Harris, Edge, & Tilley, 1994). Finally, the centrifugal effect due to the cylinder block rotation causes an inhomogeneous pressure in the radial direction in the displacement chambers (Kunkis & Weber, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Effects of inclined cylinder ports on gaseous cavitation of high-speed electro-hydrostatic actuator pumps: a numerical study

Chao

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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Raising the rotational speed of electro-hydrostatic actuator (EHA) pumps is a useful way to improve their power density. However, gaseous cavitation tends to occur in the displacement chambers at high speed, reducing the effective delivery flow rate of EHA pumps. It is a common approach to reduce the gaseous cavitation by increasing the inlet pressure. However, this conventional approach requires additional devices to boost the inlet line, which decreases the EHA pump's power density. The contribution of this study is to reduce the gaseous cavitation by introducing inclined cylinder block ports for EHA pumps, which only modifies the cylinder ports and needs no additional devices. A computational fluid dynamics (CFD) model was developed to investigate the effects of the inclined direction of cylinder ports on the gaseous cavitation. The simulation results showed that the inwardinclined design of cylinder ports could effectively decrease the gaseous cavitation using centrifugal effects of rotating fluid. Compared with a standard cylinder block, the cylinder block with inwardinclined ports could increase the effective delivery flow rate by 4% at an inlet pressure of 1 MPa and a rotational speed of 20,000 r/min. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of inclined cylinder ports on gaseous cavitation of high-speed electro-hydrostatic actuator pumps: a numerical study

Chao

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…The pressure drop versus flowrate characteristics of the filtration unit components have been plotted and curve fitted to determine the filtration unit components coefficients. Figures 7,8,and 9 show the experimental results and curve fitting for each filter. The figures show that the pressure drop (by curve fitting) is a polynomial especially at high flow rate due to filter body but at the working range the pressure drop becomes linear.…”

Section: Static Characteristics Measurement Booster Pump Test Rigmentioning

confidence: 99%

Simulation of a Reverse Osmosis Seawater Desalination Plant, Part 2: Experimental Measurements and Prediction Study on the Validated Simulation Model

Lotfy

Saleh

2008

The International Conference on Applied Mechanics and Mechanica

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The present work introduces experimental investigations of a real reverse osmosis (RO) plant. Flowrate and pressure measurements have been performed. The pump pressure fluctuations at different flowrates and the permeate pressure of RO membrane at different seawater salinities have been measured experimentally. The results of the present experimental measurements and some of the previously published experimental results of RO membrane have been compared with the corresponding theoretical results of the plant theoretical model in order to validate the simulation program (presented in part 1 of this paper). In the present work the validated simulation model has been used to carry out prediction study to investigate the dynamic characteristics of the plant axial piston pump and the RO membrane performance under normal and abnormal operating conditions. The RO plant simulation model has been used to present a proposed operational chart for the investigated desalination plant in case of working under different feed water salinity and temperature.

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“…Pettersson et al [30] and Harris et al [31] presented a relatively simple cavitation model that illustrates the dynamic characteristics of piston pumps and can capture the key aspects of cavitation. Since the pressure in the pipeline element is assumed to be the vapor pressure under a vaporous cavitation condition, according to the flow continuity principle, the dynamics of the cavitation volume V cav is given by…”

Section: Continuity Equation Under Vaporous Cavitation Conditionmentioning

confidence: 99%

Pressure Transient Model of Water-Hydraulic Pipelines with Cavitation

Jiang¹,

Ren²,

Zhao³

et al. 2018

Applied Sciences

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Transient pressure investigation of water-hydraulic pipelines is a challenge in the fluid transmission field, since the flow continuity equation and momentum equation are partial differential, and the vaporous cavitation has high dynamics; the frictional force caused by fluid viscosity is especially uncertain. In this study, due to the different transient pressure dynamics in upstream and downstream pipelines, the finite difference method (FDM) is adopted to handle pressure transients with and without cavitation, as well as steady friction and frequency-dependent unsteady friction. Different from the traditional method of characteristics (MOC), the FDM is advantageous in terms of the simple and convenient computation. Furthermore, the mechanism of cavitation growth and collapse are captured both upstream and downstream of the water-hydraulic pipeline, i.e., the cavitation start time, the end time, the duration, the maximum volume, and the corresponding time points. By referring to the experimental results of two previous works, the comparative simulation results of two computation methods are verified in experimental water-hydraulic pipelines, which indicates that the finite difference method shows better data consistency than the MOC.

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The Suction Dynamics of Positive Displacement Axial Piston Pumps

Cited by 38 publications

References 0 publications

Effects of inclined cylinder ports on gaseous cavitation of high-speed electro-hydrostatic actuator pumps: a numerical study

Effects of inclined cylinder ports on gaseous cavitation of high-speed electro-hydrostatic actuator pumps: a numerical study

Simulation of a Reverse Osmosis Seawater Desalination Plant, Part 2: Experimental Measurements and Prediction Study on the Validated Simulation Model

Pressure Transient Model of Water-Hydraulic Pipelines with Cavitation

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