The effect of operating conditions on the performance of a supersonic ejector for refrigeration

Aidoun, Zine; Ouzzane, Mohamed

doi:10.1016/j.ijrefrig.2004.05.006

Cited by 49 publications

(26 citation statements)

References 8 publications

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“…These drops may block the effective area with the presence of unsteady flow and, by consequence, lead to unstable system operation [91]. A possible solution can be to superheat the fluid before passing into the nozzle even if it decreases the ejector efficiency [10,97,98]. However, it is noted that even for the isentropic and dry fluids, isentropic expansion can occur in the two-phase zone.…”

Section: Criteria For Working Fluid Selectionmentioning

confidence: 99%

“…Finally, concerning the operating conditions (on-design and off-design), among the different studies, we propose the one by Aidoun and Ouzzane [97], where they conducted a simulation of an ejector-based system via a thermodynamic model considering different ejector operation characteristics. The fluid mixing conditions, related to the mixing chamber geometry, the fluid type and the inlet and outlet conditions, can lead the ejector to work in off-design conditions with a decrease in performance.…”

Section: Standard Sersmentioning

confidence: 99%

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Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

407

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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: Criteria For Working Fluid Selectionmentioning

confidence: 99%

Section: Standard Sersmentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

407

View full text Add to dashboard Cite

show abstract

“…A multivariate statistical analysis model for ejectors was established using a structural equation model.The ejection parameter Y is expressed as Y={Y(X 1 ),Y(X 2 ),Y(X 3 ),}=ξ 1 (p 1 +p 2 )+ξ 2 [ y(d 1 ,l 1 )+y(d 2 ,l 2 )+y(d 3 ,l 3 )]+ξ 3 e, find the optimal solution for the numerical model [6] . The influence factors of the same type of array are changed, the results of sampling and analysis of each group are statistically analyzed, the relationship between the main influence factors and the ejection coefficient is obtained.…”

Section: Structural Parameters and Ejection Coefficient U A Matchingmentioning

confidence: 99%

“…Y. Bartosiewicz et al [4] optimized the ejector boost ratio and efficiency, ejected Mach number, and other parameters. At present, there are few numerical simulations based on practical applications for ejectors, which results in random products with high randomness, and continuous ignition at short intervals, insufficient explosion loudness, so the success rate of firing is too low, and the bird repellent effect is not ideal [5][6] . Based on this phenomenon, this article uses the gas gun combustor and ejector as a platform to study the influence of structural parameters on the ejection coefficient, and establishes a multivariate statistical analysis model to comprehensively evaluate the merits of the ejection performance and to perform overall flow of the combustion chamber.…”

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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“…The ejector-diffuser system also can be considered as the most important device of the solar seawater desalination. Indeed, it can be used in many complex progresses as a compressor, a fluid transport component or a vacuum pump [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Supersonic Chevron Ejector Flows

Kong¹,

Kim

Jin

2013

Journal of the Korean Society of Propulsion Engineers

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Considering the complexity and difficulty on the researching, how to enhance the performance of ejector-diffuser system effectively became a significant task. In the present study, the supersonic nozzle was redesigned using Chevrons installed at the inlet of the secondary stream of the ejector-diffuser system for the purpose of the performance improvement. A CFD method based on Fluent has been applied to simulate the supersonic flows and shock waves inside the ejector. Primary numerical analysis results show that the Chevrons get a positive effect on the ejector flows. The comparison of ejector performance with and without the Chevron was obtained and optimal number of chevron lobe is discussed to increase the performance. The ejector-diffuser system performance is discussed in terms of the entrainment ratio, pressure recovery as well as total pressure loss.

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The effect of operating conditions on the performance of a supersonic ejector for refrigeration

Cited by 49 publications

References 8 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

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

Computational Study of Supersonic Chevron Ejector Flows

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