Experimental and numerical investigation of an air to air supersonic ejector for propulsion of a small supersonic wind tunnel

Kracik, Jan; Dvořák, Václav

doi:10.1051/epjconf/20159202038

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Since a discharge coefficient is usually not known, the iterative procedure is needed for solving equation (3). The relative error between the calculated primary mass flow rate based on the introduced method and the primary mass flow rate obtained from numerical analysis is about 3 %.…”

Section: Methodsmentioning

confidence: 99%

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Preliminary study of the primary nozzle position of a supersonic air ejector with a constant-area mixing chamber

Kracik

Dvořák

2017

EPJ Web Conf.

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Abstract. This work aims at investigating the primary nozzle position in a proposed supersonic air ejector device. The ejector is primarily made up of a supersonic primary nozzle, which is located in the axis of the ejector, a suction chamber or secondary stream inlet, a mixing chamber and a diffuser. The ejector design allows to translate the primary nozzle in the axis direction and fix it in a chosen distance from the beginning of the mixing chamber and hence influence the secondary mass flow rate. In a limit case, it is possible to set the nozzle to such a position where no secondary flow occurs. If we ignore the case where no secondary flow occurs, five different nozzle distances have been investigated in this paper. Some cases seem to be alike and there are no significant dissimilarities between them. Courses of relative back-pressure ratio are carried out against the entrainment ratio and transition between on-design and off-design regimes is determined. Measurements of the mixed flow based on the standard ISO 5167 are performed by means of orifice plate method. In addition, a comparison between experiments and simulations performed by Ansys Fluent software is presented in order to indicate further improvements to the numerical model.

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Section: Methodsmentioning

confidence: 99%

“…The first arrangement uses a slot primary nozzle. The second one uses several primary nozzles and was investigated in works [3][4][5][6]. Many theoretical, experimental and numerical researches have been carried out to obtain the performance of ejector correctly so far.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of the primary nozzle position of a supersonic air ejector with a constant-area mixing chamber

Kracik

Dvořák

2017

EPJ Web Conf.

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“…However, there has not been established a definite link between the performance of constant area and constant pressure ejectors [3]. The flow in constant-pressure ejectors was for example investigated by Kracik and Dvorak in work [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Supersonic Ejectors Working with R-1234ze(E)

et al. 2018

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These days, much effort is being put into lowering the consumption of electric energy and involving renewable energy sources. Many engineers and designers are trying to develop environment-friendly technologies worldwide. It is related to incorporating appropriate devices into such technologies. The object of this paper is to investigate these devices in connection with refrigeration systems. Ejectors can be considered such as these devices. The primary interest of this paper is to investigate the suitability of a numerical model for an ejector, which is incorporated into a refrigeration system. In the present paper, there have been investigated seven different test runs of working of the ejector with a working fluid R-1234ze(E). Some of the investigated cases seem to have a good agreement and there are no significant discrepancies between them, however, there are also cases that do not correspond to the experimental data at all. The ejector has been investigated in both on-design and off-design working modes. A comparison between the experimental and numerical data (CFD) performed by Ansys Fluent software is presented and discussed for both an ideal and a real gas model. In addition, an enhanced analytical model has been introduced for all runs of the ejector.

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Ejector Design

Grazzini¹,

Milazzo²,

Mazzelli³

2018

Ejectors for Efficient Refrigeration

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Experimental and numerical investigation of an air to air supersonic ejector for propulsion of a small supersonic wind tunnel

Cited by 5 publications

References 2 publications

Preliminary study of the primary nozzle position of a supersonic air ejector with a constant-area mixing chamber

Preliminary study of the primary nozzle position of a supersonic air ejector with a constant-area mixing chamber

Experimental and Numerical Study on Supersonic Ejectors Working with R-1234ze(E)

Ejector Design

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