Journal ArticleDOI
Computational fluid dynamics simulation of the supersonic steam ejector. Part 2. Optimal design of geometry and the effect of operating conditions on the ejector
Lin Cai,Hongtao Zheng,Yajun Li,Zhiming Li +3 more
- Vol. 226, Iss: 3, pp 715-723
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In this paper, the authors investigate the use of computational fluid dynamics in predicting the performance and optimal design of the geometry of a steam ejector used in a steam turbine using IAPWS IF97 model.Abstract:
The aim of this study is to investigate the use of computational fluid dynamics in predicting the performance and optimal design of the geometry of a steam ejector used in a steam turbine. In the current part, the real gas model was considered using IAPWS IF97 model, and the influences of working fluid pressure and backpressure were investigated. The results illustrate that working critical pressure and backflow critical pressure exist in the flow. Moreover, the entrainment ratio reaches its peak at the working critical pressure. The performance of the ejector was nearly the same when the outlet pressure was lower than the critical backpressure. Effects of ejector geometries were also investigated. The distance between the primary nozzle and the mixing chamber was at optimum, the length of the mixing chamber and the diameter of the throat had an optimal value according to the entrainment ratio. When the length of the diffuser or throat was decreased within a range, the entrainment ratio did not change sig...read more
Citations
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Journal ArticleDOI
Parametric experimental studies on mixing characteristics within a low area ratio rectangular supersonic gaseous ejector
TL;DR: In this paper, the entrainment ratio (ER) of the ejector, the non-mixed length (LNM), and potential core length of the primary supersonic jet are measured to characterize mixing within the su-personic ejector.
Journal ArticleDOI
Review on ejector of vapor jet refrigeration system
TL;DR: The developmental progress of the VJR technology has been categorized into the following groups, namely (a) general performance of an ejector, (b) numerical analysis, viz., classical one-dimensional analysis and Computational Fluid Dynamics (CFD) analysis, (c) experimental studies, flow visualization studies, (e) performance enhancement techniques, and (f) two-phase ejector as discussed by the authors.
Parametric experimental studies on mixing characteristics within a low area ratio rectangular supersonic gaseous ejector (vol 28, 076101, 2016)
TL;DR: In this article, the entrainment ratio (ER) of the ejector, the non-mixed length (LNM), and potential core length of the primary supersonic jet are measured to characterize mixing within the su-personic ejector.
Journal ArticleDOI
Computational fluid dynamics simulation of the supersonic steam ejector using different condensation model
TL;DR: In this article, a non-equilibrium condensation model for supersonic steam ejector under the assumption of no slip velocity between the droplets and vapor phase and homogenous nucleation was proposed.
References
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Journal ArticleDOI
Investigation and improvement of ejector refrigeration system using computational fluid dynamics technique
TL;DR: In this paper, the computational fluid dynamics (CFD) code, FLUENT, is employed to predict the flow phenomena and performance of CPM and CMA steam ejectors.
Journal ArticleDOI
CFD analysis of ejector in a combined ejector cooling system
TL;DR: In this article, several ejector designs were modelled using finite volume CFD techniques to resolve the flow dynamics in the ejectors, and the results were validated with available experimental data.
Journal ArticleDOI
Performance prediction of steam ejector using computational fluid dynamics: Part 2. Flow structure of a steam ejector influenced by operating pressures and geometries
TL;DR: The aim of this study is to reveal the complication of the flow and the mixing process of a steam ejector used in a jet refrigeration cycle by using the simulation software package (FLUENT).
Journal ArticleDOI
Design and Testing of Ejectors for High Temperature Fuel Cell Hybrid Systems
TL;DR: In this paper, an experimental rig has been developed to test single stage ejectors for hybrid systems at different operative conditions of mass flow rates, pressures, and temperatures, including atmospheric conditions in the secondary duct.