Document Detail

Existence of mach cones and helical vortical structures around the underexpanded circular jet in the helical oscillation mode.
MedLine Citation:
PMID:  12141369     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Existence of Mach cone and helical vortical structure in the helical oscillation mode of an underexpanded circular jet was confirmed by using schlieren instantaneous photographs and drawing of the envelopes of the Mach cones by the superposition of spherical sound waves radiated from two moving sound sources about the jet axis at a supersonic speed. Existence of such structures was conjectured in our earlier paper [Umeda and Ishii, J. Acoust. Soc. Am. 110, 1845-1858 (2001)]. The envelopes of a Mach cone are observed as a V-shaped pattern composed of a pair of clear fine lines starting from a prominent point, which rotates about the jet axis. The helical vortical structure is observed as a bright pattern of the gathering of the tiny specks around the jet. It always appears to overlap on the envelopes of the moving Mach cones.
Yoshikuni Umeda; Ryuji Ishii
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Publication Detail:
Type:  Comment; Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  112     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-26     Completed Date:  2002-08-22     Revised Date:  2006-12-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  99-107     Citation Subset:  -    
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Japan.
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Comment On:
J Acoust Soc Am. 2001 Oct;110(4):1845-58   [PMID:  11681366 ]

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