Numerical Investigation on the Performance of Different Primary Nozzle Structures in the Supersonic Ejector

Computational fluid dynamics (CFD) technique is employed to investigate the effect of primary nozzle structures on the supersonic ejector performance. The performance of the supersonic ejectors with three different nozzle structures, including conical nozzle, petalage nozzle and crenation nozzle, ha...

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Bibliographic Details
Published in:Energy procedia 2017-05, Vol.105, p.4997-5004
Main Authors: Xue, Kangkang, Li, Kaihua, Chen, Weixiong, Chong, Daotong, Yan, Junjie
Format: Article
Language:English
Subjects:
CFD
Critical back pressure
Entrainment ratio
Primary nozzle
Supersonic ejector
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Summary:Computational fluid dynamics (CFD) technique is employed to investigate the effect of primary nozzle structures on the supersonic ejector performance. The performance of the supersonic ejectors with three different nozzle structures, including conical nozzle, petalage nozzle and crenation nozzle, have been compared under the same conditions. Compared with the ejector equipped with the conical nozzle, the entrainment ratio of petalage nozzle is slightly smaller, while the critical back pressure increases by 5.2%. Just the opposite, the entrainment ratio of crenation nozzle is slightly higher, and the critical back pressure would decrease by 2.1%. In addition, the effects of primary/induced fluid pressure on the flow field (pressure and Mach number along the ejector centerline) are observed and analyzed to explain the mixing process occurring inside the ejector. It finds out that the shape of the mixing layer in the supersonic ejector with different nozzles is different.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2017.03.1000