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Experimental Studies on Coaxial Vortex Loops
University of Manchester.ORCID iD: 0000-0003-0820-7009
University of Manchester.
2010 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 22, no 12, article id 126102Article in journal (Refereed) Published
Abstract [en]

An experimental study has been conducted on the formation and propagation of coaxial vortex loops using a shock tube facility. The study aimed at evaluating the flow characteristics of pairs of corotating vortex rings that generate the leapfrogging phenomenon. The driver and driven gas of the shock tube were air. Three driver pressures were used (4, 8, and 12 bars) with the driven gas being at ambient conditions. The Mach numbers of the shock wave generated inside the shock tube were 1.34, 1.54, and 1.66, respectively. The sudden expansion present at the diaphragm location effectively decreased the Mach number value of the traveling shock wave. Results showed that apair of vortex rings staggered with respect to time and with the same direction rotation lead to leapfrogging. Results also indicated that the number of leapfrogging occurrences is related to the Reynolds number of the vortex ring pairs with a decrease in leapfrogs at higher Reynolds numbers.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2010. Vol. 22, no 12, article id 126102
Keywords [en]
Vortex loops, co-axial, leapfrogging, shock tube
National Category
Fluid Mechanics and Acoustics
Research subject
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263183DOI: 10.1063/1.3520187ISI: 000285770200036Scopus ID: 2-s2.0-79251591661OAI: oai:DiVA.org:kth-263183DiVA, id: diva2:1367088
Note

QC 20191105

Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-11-05Bibliographically approved

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