Supersonic flow structure in the entrance part of a mixing chamber of 2D model ejector

Dvořák, Václav; Šafařík, Pavel

doi:10.1007/s11630-003-0042-8

Cited by 24 publications

(8 citation statements)

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“…Of particular importance is the dissipative effect of the shock trains as it produces a compression and a shift from supersonic to subsonic conditions. There is considerable research concerning experimental [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] and numerical [66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81] studies of the flow phenomena inside an ejector. Even further detailed knowledge and modeling of these phenomena should allow for better component design.…”

Section: Supersonic Ejectormentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

406

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a b s t r a c tThe increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

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Section: Supersonic Ejectormentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

406

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“…With the new developments in computers and data-processing technologies, recent studies have become more comprehensive on mixing chamber geometry, local flow structure, shock wave formation and irreversibility [138,[201][202][203][204][205][206]. A number of these studies were devoted to turbulence model evaluation and selection with respect to specific requirements in ejector operation based on comparison with local/global data and generating valuable information on local flow structure [75,203,[207][208][209].…”

Section: Numerical Ejector Modelingmentioning

confidence: 99%

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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“…Ejectors are widely used in petrochemicals, navigation and other fields, such as exhaust emissions, jet aeration, airport birds repelling.The research on the parameters related to ejector and ejector characteristics at domestic and abroad aims to continuously improve its ejecting performance.Dvorak et al analyzed the effect of pressure recovery on the parameters of the iso-section ultra-super ejector system [1] ; Winoto et al analyzed the influence of the shock wave in the diffuser section on the ejector characteristics [2] .Tang Jianfeng et al conducted an indoor simulation test on the structural parameters of the ejector and obtained the influence of the structural parameters on the ejector performance [3] . Y. Bartosiewicz et al [4] optimized the ejector boost ratio and efficiency, ejected Mach number, and other parameters.…”

Section: Introductionmentioning

confidence: 99%

Study on Ejecting Characteristics of Gas Gun Gas-Gas Super-ejector Combustor

Yang¹,

Wang²,

Zhou³

2018

Proceedings of the 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 201

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Abstract. Aiming at the low success rate of gun firing with gas gun in the airport, the launch characteristics of gas-gas ejector were studied based on Fluent software to improve the ejection performance. Through the multivariate statistical analysis model, the single-value influence curve of each structural parameter of ejector on the ejector coefficient is obtained, and the theoretical ejector coefficient corresponding to the main component of the gas is obtained by stoichiometric analysis. Matching ejector structure parameters and ejector coefficients, the numerical simulation results of the optimized model show that the gas filling rate increases, the gas distribution in the combustion chamber is uniform and the concentration is increased. The previous ignition combustion product has no obvious effect on the secondary ignition, and is effective Solves the problem that the success rate of the original model is too low and achieves a continuous ignition of the ejector for a short time and enhances the ejecting performance comprehensively.

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Supersonic flow structure in the entrance part of a mixing chamber of 2D model ejector

Cited by 24 publications

References 1 publication

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

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

Study on Ejecting Characteristics of Gas Gun Gas-Gas Super-ejector Combustor

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