Experimental and numerical investigation of the effect of shock wave characteristics on the ejector performance

The entrainment performance and the shock wave structures in a three-dimensional ejector were investigated by Computational Fluid Dynamics (CFD) and Schlieren flow visualization. The ejector performance was evaluated based on the mass flow rates of the primary and secondary flows. The shock wave str...

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Bibliographic Details
Published in:International journal of refrigeration Vol. 40; pp. 31 - 42
Main Authors: Zhu, Yinhai, Jiang, Peixue
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01.04.2014
Elsevier
Subjects:
Applied sciences
CFD modeling
Ejecteur
Ejector
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Longueur d'onde de choc
Modélisation de la turbulence
Modélisation à l'aide de la mécanique des fluides numérique
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Schlieren
Shock wavelength
Turbulence model
Longueur d'onde de choc
Schlieren
Shock wavelength
Ejector
CFD modeling
Ejecteur
Turbulence model
Modélisation de la turbulence
Modélisation à l'aide de la mécanique des fluides numérique
Refrigeration installation
ISSN:0140-7007, 1879-2081
Online Access:Get full text
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Summary:The entrainment performance and the shock wave structures in a three-dimensional ejector were investigated by Computational Fluid Dynamics (CFD) and Schlieren flow visualization. The ejector performance was evaluated based on the mass flow rates of the primary and secondary flows. The shock wave structures in the ejector mixing chamber were captured by the optical Schlieren measurements. The results show that the expansion waves in the shock train do not reach the mixing chamber wall when the ejector is working at the sub-critical mode. Decreasing of the shock wave wavelength increases the secondary mass flow rate. A three-dimensional CFD model with four turbulence models was then compared with the experimental data. The results show that the RNG k-ε model agrees best with measurements for predictions of both the mass flow rate and shock wave structures. •The shock wave structures are captured by the optical Schlieren measurements.•The RNG k-ε model agrees best with measurements.•The expansion waves do not reach the mixing chamber wall at the sub-critical mode.•Reducing the shock wave wavelength will improve the ejector performance.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2013.11.008