Code-to-code comparison for analysing the steady-state heat transfer and natural circulation in an air-cooled RCCS using GAMMA+ and Flownex

Rousseau, P.G.; Toit, C.G. Du; Jun, Jiheon; Noh, Jae Man

doi:10.1016/j.nucengdes.2015.05.004

Cited by 12 publications

(2 citation statements)

References 19 publications

(20 reference statements)

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“…By solving the mass(5), energy (6) and momentum balance equations [( 14) or ( 15) or ( 16)] for the compressor impeller and downstream components such as the vaneless space, the mass flow rates, stagnation enthalpy changes and stagnation pressure changes through the system can be calculated.…”

Section: Finite Volume Thermofluid Network Methodology Balance Equationsmentioning

confidence: 99%

“…Due to the usefulness of the thermofluid network approach a series of commercial and research codes have been released in recent years such as Flownex SE [3], GFSSP (Generalized Fluid System Simulation Program by NASA) [2], AxSTREAM System [4] and APROS [5]. The extensive utilization of the thermofluid network modelling approach can be observed in the development of next generation energy technologies such as pebble-bed nuclear reactor cycles [6,7] and supercritical carbon-dioxide (sCO2) Brayton power cycles [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Real Gas Compression Using the Finite Volume Thermofluid Network Methodology and Mean-Line Approach for Centrifugal Compressors

Laubscher,

Rousseau,

van der Spuy

et al. 2024

Preprint

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A novel compressible real gas 1D finite volume thermofluid network modelling methodology is proposed that can be applied in the analysis of supercritical CO2 (sCO2) power cycles. It is applied to simulate centrifugal compressor performance via a mean line approach that directly solves the mass, energy, and momentum balance equations for the discretized flow channels within the machine along with the associated loss models, component characteristics, and applicable compressible real gas equation of state. This can be integrated seamlessly with the rest of the power cycle components like pipes, valves, heat exchangers, etc., thereby eliminating the need for static performance maps and the associated difficulties to ensure similarity over the whole range of operation. This direct simulation of the internal flows also makes it possible to do integrated cycle design optimization that includes the geometry of the compressors, and to simulate fast transients for dynamic analysis. The methodology was applied to simulate well-documented air and sCO2 centrifugal compressors and compared the generated results with that of conventional thermofluid network incompressible and compressible ideal gas approaches. The results indicate that the proposed compressible real gas approach can capture the stagnation pressure changes and isentropic efficiencies with good accuracy for both cases over the whole range of mass flow rates and shaft rotational speeds. In contrast, the conventional thermofluid network incompressible and compressible ideal gas approaches are only applicable in selected regions of the fluid property regime and suffer from discretization errors and inappropriate treatment of the relationship between stagnation and static pressures. Furthermore, comparative analyses between the newly proposed approach and the traditional mechanical energy balance method are performed, showing that the latter approach needs to be discretized more finely through the compression process to correctly capture the polytropic compression path shape, whereas the former more accurately captures the stagnation pressure changes through the analyzed compressors with only a single increment per compressor component.

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Section: Finite Volume Thermofluid Network Methodology Balance Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of Real Gas Compression Using the Finite Volume Thermofluid Network Methodology and Mean-Line Approach for Centrifugal Compressors

Laubscher,

Rousseau,

van der Spuy

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

CFD and systems thermal-hydraulic analysis in the design and safety assessment of high-temperature reactors

Rousseau

Toit

Antwerpen

2019

Advances of Computational Fluid Dynamics in Nuclear Reactor Design and Safety Assessment

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Thermal-hydraulic behavior simulations of the reactor cavity cooling system (RCCS) experimental facility using Flownex

Sena,

Hassan

2023

Nuclear Engineering and Technology

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Code-to-code comparison for analysing the steady-state heat transfer and natural circulation in an air-cooled RCCS using GAMMA+ and Flownex

Cited by 12 publications

References 19 publications

Modelling of Real Gas Compression Using the Finite Volume Thermofluid Network Methodology and Mean-Line Approach for Centrifugal Compressors

Modelling of Real Gas Compression Using the Finite Volume Thermofluid Network Methodology and Mean-Line Approach for Centrifugal Compressors

CFD and systems thermal-hydraulic analysis in the design and safety assessment of high-temperature reactors

Thermal-hydraulic behavior simulations of the reactor cavity cooling system (RCCS) experimental facility using Flownex

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