Valve dynamics in multi-cylinder positive displacement pump model

Josifovic, Aleksandar; Corney, Jonathan; Davies, Bruce

doi:10.1109/aim.2015.7222505

Cited by 5 publications

(11 citation statements)

References 10 publications

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“…With the inclusion of valve dynamics, the results of the transient response of the triplex system obtained by Josifovic et al [15] are comparative to that obtained by Iannetti et al [22]. As such, their results can be used to benchmark and validate the model developed in this thesis.…”

Section: Review Of Current Modelling Effortsmentioning

confidence: 70%

“…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%

“…They were able to predict the average flow rate across the pump within 3% of the experimental measurements but only for steady state operations. In a separate study conducted by Josifovic et al [15], valve dynamics as well as their effect on the flow and transient response of a triplex system were investigated in a single computational model.…”

Section: Review Of Current Modelling Effortsmentioning

confidence: 99%

“…In this simple model, the maximum displacement of the valve is constrained by the valve seat and the opening height is governed by the pressure difference across the valve. Josifovic et al [15] proposed a simple valve model by assuming uniform pressure distributions on the surfaces of a idealistic poppet valve. The operating states of their valve model are governed by the three characteristic cases presented in Figure 2.8.…”

Section: Check Valve Dynamicsmentioning

confidence: 99%

“…Because the length of the connecting rod and the radius of the crankshaft are constant for a given pump configuration, the piston position is solely a function of the crank angle. Based on the derivation in [15], the piston-crank angle relation is expressed as The velocity of the piston is determined by computing the first derivative of the piston position relation. This is given by…”

Section: Piston Kinematicsmentioning

confidence: 99%

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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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Section: Review Of Current Modelling Effortsmentioning

confidence: 70%

Section: Piston Kinematicsmentioning

confidence: 99%

Section: Review Of Current Modelling Effortsmentioning

confidence: 99%

Section: Check Valve Dynamicsmentioning

confidence: 99%

Section: Piston Kinematicsmentioning

confidence: 99%

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