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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i3.20
16 pages

NEAR-FIELD STRUCTURES OF AN UNDEREXPANDED SONIC COAXIAL JET

Kwon-Hee Lee
Department of Mechanical Engineering, Saga University, 1, Honjo, Saga 840-8502, Japan
Toshiaki Setoguchi
Institute of Ocean Energy (IOES), Saga University, 1, Honjo-machi, Saga 840-8502, Japan
Shigeru Matsuo
Department of Advance Technology Fusion, Saga University, Japan
Heuy Dong Kim
Department of Mechanical Engineering, Andong National University, Andong 760-749, Korea

RÉSUMÉ

The near-field structure of an underexpanded sonic dual coaxial jet issuing from the coaxial nozzles of four different geometries is visualized by using a shadowgraph optical method. Experiments are conducted to investigate the effects of the nozzle geometry, such as nozzle-lip thickness, secondary stream thickness, the nozzle pressure ratio, and swirling of the secondary stream on the characteristics of the primary underexpanded jet. The results show that the presence of secondary annular swirling stream causes the Mach disc to move more downstream and increases its diameter, while the diameter of the Mach disc decreases with the decrease in the nozzle-lip thickness. The secondary stream thickness has an influence on the location of an annular shock wave. However, the effect of the secondary stream on the characteristics of the underexpanded coaxial jet is strongly dependent on the pressure ratio of the inner primary jet.


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