| Existence of mach cones and helical vortical structures around the underexpanded circular jet in the helical oscillation mode. | |
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MedLine Citation:
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PMID: 12141369 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Yoshikuni Umeda; Ryuji Ishii |
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Publication Detail:
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Type: Comment; Journal Article |
Journal Detail:
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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:
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Created Date: 2002-07-26 Completed Date: 2002-08-22 Revised Date: 2006-12-27 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 99-107 Citation Subset: - |
Affiliation:
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Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Japan. umeda@kuaero.kyoto-u.ac.jp |
Export Citation:
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Descriptor/Qualifier:
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| Comments/Corrections | |
Comment On:
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J Acoust Soc Am. 2001 Oct;110(4):1845-58
[PMID:
11681366
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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