Published 4 issues per year
ISSN Print: 1065-3090
ISSN Online: 1940-4336
Indexed in
NEAR-FIELD STRUCTURES OF AN UNDEREXPANDED SONIC COAXIAL JET
ABSTRACT
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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Shi Hai-Tao, Sun Pei-Zhao, Lu Xi-Yun, Large-eddy Simulation of Underexpanded Sonic Coaxial Jet, Procedia Engineering, 126, 2015. Crossref
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Shi Haitao, Chen Dawei, Wang Pei, Liu Nansheng, Lu Xiyun, Numerical Investigation of the Coherent Structures and Sound Properties in Sonic Coaxial Jets, Advances in Applied Mathematics and Mechanics, 9, 3, 2017. Crossref