Pressure pulsations in reciprocating pump piping systems Part 1: Modelling

Burrows, C. R.; Edge, K A

doi:10.1243/0959651971539768

Cited by 25 publications

(26 citation statements)

References 11 publications

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“…However, via the MOC, they can be transformed into ordinary differential equations (Equations (8) and (9)) along the characteristic lines C + and C − .…”

Section: Methods Of Characteristicsmentioning

confidence: 99%

“…Transient pressure pulsations often lead to unexpected chatter, overshooting, and a zero bias of tracking error in the electrohydraulic control system [4][5][6][7]. Shu et al [8][9][10] developed a vaporous cavitation model that used a two-phase homogeneous equilibrium to simulate pipeline pressure transients with upstream, midstream, and downstream cavitation. Bergant et al [11,12] discussed three cavitation models: the discrete vapor cavity model (DVCM), the discrete gas cavity model (DGCM), and the generalized interface vaporous cavitation model (GIVCM).…”

Section: Introductionmentioning

confidence: 99%

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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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“…However, via the MOC, they can be transformed into ordinary differential equations (Equations (8) and (9)) along the characteristic lines C + and C − .…”

Section: Methods Of Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Transient Model of Water-Hydraulic Pipelines with Cavitation

Jiang¹,

Ren²,

Zhao³

et al. 2018

Applied Sciences

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“…Decreasing cavitation and erosion under operating conditions leads to a longer life valve, resulting in reduced costs for the end user. Many authors (Johnston, 1991;Shu, Burrows, & Edge, 1997) in the past have studied PD pumps by means of analytic methods such as 1D lumped parameter models. Johnston's model, for instance, was composed "of a number of inter-linked mathematical models representing the pump components".…”

Section: Introductionmentioning

confidence: 99%

A CFD and experimental study on cavitation in positive displacement pumps: Benefits and drawbacks of the ‘full’ cavitation model

Iannetti

Stickland

Dempster

2015

Engineering Applications of Computational Fluid Mechanics

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To fill the gap in the literature in terms of numerical studies of positive displacement (PD) pumps in a cavitating condition, a comprehensive and transient computational fluid dynamics (CFD) model of a PD pump, simulating the cavitation arising during the suction stroke, was created. The 'full' cavitation model was utilized to study its capability on PD pump cavitation. A set of three plunger speeds were simulated. Using the highest plunger speed, an assessment was made of the effect of 1.5, 3, 4.5 and 15 parts per million (ppm) of air mass fraction on pump performance and cavitation. An experimental test rig, replicating the CFD model, was designed and built in order to validate the numerical model and find its weaknesses. CFD modeled, in a consistent way, the fluid dynamics phenomena related to cavitation (the chamber pressure approaching the vapor pressure, the vaporization/condensation and the pressure spike occurrence at the end of the suction stroke marking the end of cavitation). On the other hand the CFD pressure trends calculated appeared stretched along the time axis with respect to the experimental data, and this highlighted issues in the multiphase and cavitation models: the vaporization/condensation rate calculated by CFD did not follow the real dynamics correctly because the non-condensable gas expansion was overestimated. This was seen when comparing the CFD/experimental results where the simulated pressure drop gradient at the beginning of the suction stroke and the pressure peaks as the valve closed exhibited a delay in their occurrence. The simulation results were sensitive to the dissolved air mass fraction as the delay depended on the amount of air dissolved in the water. Although the influence of the air mass fraction was considered consistent, the 3 ppm CFD case was the closest to the experimental results, whereas the analyst expected the 15 ppm case to be more accurate. ARTICLE HISTORY

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“…Johnson [20] developed a numerical model to further investigate the performance of reciprocating pumps with the inclusion of a mathematical model of the valves, however a constant inlet manifold pressure was assumed. Shu et al [21] proposed a model for the inlet manifold that accounts for the presence of air pockets and pressure variations as well as a finite element model based on the Galerkin method, for investigating pressure pulsations in the suction and discharge pipelines. However, scenarios of pumps with multiple cylinders were not investigated.…”

Section: Review Of Current Modelling Effortsmentioning

confidence: 99%

“…The kinematics of a reciprocating piston have been studied thoroughly in the literature [15,16,21]. In the simplest case, a piston-crank mechanism consists of a piston cylinder and a crankshaft which are connected by a connecting rod.…”

Section: Piston Kinematicsmentioning

confidence: 99%

Transient Modelling of a Positive Displacement Pump for Advanced Power Cycle Applications

Huang¹

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I dedicate this thesis to my beloved mother. DeclarationI hereby declare that except where specific reference is made to the work of others, all the work contained within this thesis is my original work and have not been submitted in whole or in part for consideration for any other degree or qualification. AbstractCompared to the conventional fossil-based steam Rankine cycle, supercritical carbon dioxide (sCO 2 ) power cycles possess the potential to achieve higher thermodynamic efficiencies and lower component costs. As such, they have been proposed for the next generation of renewable energy technologies in an effort to strive for a sustainable future by reducing global greenhouse gas emissions.The improvement in thermal-to-electric energy conversion efficiency in sCO 2 power cycles is primarily attributed to the reduction of power required at the compression stage. Although small-scale prototype CO 2 compressors have been developed and tested, large-scale commercial units are currently unavailable due to their inherent complexity in design. This is one of the primary drawbacks contributing to the present absence of large-scale operational sCO 2 power plants. Fortunately, large-scale CO 2 transfer pumps are commercially available today and they possess the potential for direct integration into the sCO 2 power system. This presents an opportunity to eliminate the research efforts required to develop a new large-scale CO 2 compressor technology.To assess the compatibility and performance of the CO 2 transfer pump in the sCO 2 power cycle, a detailed theoretical model of the pump system is sought. The current research focus is to establish a numerical model using the Python programming platform for predicting and analysing the transient behaviour of the single-acting positive displacement CO 2 pump, in particular, triplex and quintuplex systems were studied. Zero-dimensional (0D) lumped parameter modelling of the fluid system was initially completed to establish a baseline model. Next, compressible quasi-one-dimensional (1D) Euler equations coupled with Helmholtz energy formulation were used to describe the flow behaviour and thermophysical properties of the working fluid accounting for real gas effects. In the detailed model, valve dynamics and the multiplex system response were also investigated.The computer models developed in this thesis provided good insight into to the transient dynamics of a positive displacement CO 2 pump operating in a simple environment under x ideal inlet conditions. The response characteristics of the transient pump model showed good agreement with experimental data obtained form the literature. The primary benefit of developing an accurate numerical model of the CO 2 transfer pump without the use of commercially available computational fluid dynamics (CFD) packages is the significant savings in computational effort and cost. A dynamic model integrated into a power system not only predicts transient system behaviours, but it can also adjust system inputs accordingly to meet the desir...

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Pressure pulsations in reciprocating pump piping systems Part 1: Modelling

Cited by 25 publications

References 11 publications

Pressure Transient Model of Water-Hydraulic Pipelines with Cavitation

Pressure Transient Model of Water-Hydraulic Pipelines with Cavitation

A CFD and experimental study on cavitation in positive displacement pumps: Benefits and drawbacks of the ‘full’ cavitation model

Transient Modelling of a Positive Displacement Pump for Advanced Power Cycle Applications

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