CFD Prediction of Supersonic Ejectors Performance

Désévaux, Philippe; Marynowski, T.; Khan, Mohamed

doi:10.1515/tjj.2006.23.3.173

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…Ejectors with no induced flow may also be used to produce a vacuum effect [133][134][135][136]. In aerospace engineering, thrust augmentation is an area where ejectors play an important role.…”

Section: Aeronautics and Space Applicationsmentioning

confidence: 99%

“…Grid structure is important as well because of its effect on false diffusion, the impact of which is reduced by grid refinement. The results need to be grid independent in order to ensure they are reliable [134][135][136]215,217,[235][236][237].…”

Section: Mesh Sensitivitymentioning

confidence: 99%

“…Where possible, most ejector modeling has been validated by comparison with experiments focused on global data in terms of pressures, temperatures and flow rates [58,94,136,169,217,219,237,276,277] to name only a few. Several comparisons between simulation and experiments were performed and discrepancies were generally fair (5% to 15% approximately) for analytical modeling [59,70,278].…”

Section: Global Validationmentioning

confidence: 99%

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Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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Ejectors used in refrigeration systems as entrainment and compression components or expanders, alone or in combination with other equipment devices, have gained renewed interest from the scientific community as a means of low temperature heat recovery and more efficient energy use. This paper summarizes the main findings and trends, in the area of heat-driven ejectors and ejector-based machines, using low boiling point working fluids, which were reported in the literature for a number of promising applications. An overall view of such systems is provided by discussing the ejector physics principles, as well as a review of the main developments in ejectors over the last few years. Recent achievements on thermally activated ejectors for single-phase compressible fluids are the main focus in this part of the review. Aspects related to their design, operation, theoretical and experimental approaches employed, analysis of the complex interacting phenomena taking place within the device, and performance are highlighted. Conventional and improved ejector refrigeration cycles are discussed. Some cycles of interest employing ejectors alone or boosted combinations are presented and their potential applications are indicated.

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Section: Aeronautics and Space Applicationsmentioning

confidence: 99%

Section: Mesh Sensitivitymentioning

confidence: 99%

Section: Global Validationmentioning

confidence: 99%

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Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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“…Convective terms are discretized with a flux splitting method in order to capture shock accurately (second order upwind), while the diffusive terms use a central difference discretization. Turbulence is modeled using the standard k-ǆ model which has been found to simulate adequately flow phenomena in dry air powered ejectors (Marynowski et al, 2006 ;Desevaux et al 2006). …”

Section: Cfd Modelmentioning

confidence: 99%

“…The numerical approach is realized with the Computational Fluid Dynamics (CFD) software FLUENT in which a 2D axisymmetric model of non-equilibrium condensation in high Regular Paper speed flows was implemented. The model is based on that previously developed by the present authors to simulate incondensable flows in ejectors (Desevaux et al, 2001 ;Desevaux et al, 2004 ;Marynowski et al, 2006). The first stage of the overall study is presented here and focuses on the flow visualization of the condensation process in a supersonic ejector.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical visualizations of condensation process in a supersonic ejector

Marynowski

Désévaux

Mercadier

2009

J Vis

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The present study deals with the visualization of the droplet condensation phenomenon that can occur in ejectors powered by moist air. The condensation process is visualized through a numerical model of non-equilibrium condensation in high speed flows implemented by the present authors in a CFD code. The evolution of the region of condensation in the ejector with the primary stagnation pressure is examined both in the case without secondary flows and in the case with free entrainment of induced air. Laser tomography visualization is used to validate the computational results. The effects of some parameters such as the primary stagnation pressure and the humidity ratio in the primary and secondary air flows are also examined. Limitations of the present numerical model are discussed.

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A computational model of a transcritical R744 ejector based on a homogeneous real fluid approach

Smołka¹,

Buliński²,

Fic³

et al. 2013

Applied Mathematical Modelling

142

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CFD Prediction of Supersonic Ejectors Performance

Cited by 13 publications

References 8 publications

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Experimental and numerical visualizations of condensation process in a supersonic ejector

A computational model of a transcritical R744 ejector based on a homogeneous real fluid approach

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