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Head On Collisions of Compressible Vortex Rings on a Smooth Solid Surface.: Effects of Surface Distance Variation.
University of Manchester.ORCID iD: 0000-0003-0820-7009
University of Manchester.
University of Manchester.
2013 (English)In: Shock Waves, ISSN 0938-1287, E-ISSN 1432-2153Article in journal (Refereed) Published
Abstract [en]

An experimental study has been conducted onthe effects of distance variation on the impingement processof compressible vortex rings on a stationary solid wall. An experimental incident Mach number of 1.61 was used. Qualitative and quantitative studies compared the impingement and interaction flow characteristics of a compressible vortex ring with a stationary, solid, smooth surface at three distances: 1.66, 3.33, and 5.00 inner diameters. The three distances corresponded to an under-developed vortex ring(1.66 inner diameters), a vortex ring at its development threshold (3.33 inner diameters), and a fully developed one (5.00 inner diameters). Qualitative schlieren results showed that the surface distance affected the shock/vortex interaction process along with the impingement process of the vortex ring and the flow structure of its trailing jet. Quantitative data were extrapolated to evaluate the propagation velocity of the vortex ring prior to impingement. The boundary layer thickness was also estimated. Particle image velocimetry studies showed the main and secondary vortices to have opposite vorticity, with the magnitude of the vorticity of the secondary vortices being approximately half of that of the main vortex. Surface pressure results reveal the symmetrical properties ofthe impinging flow, along with a direct correlation between the maximum pressure measured at the instant the vortex ring impingement and an increase in surface distance.

Place, publisher, year, edition, pages
2013.
Keywords [en]
Vortex ring, Surface impingement, Shock/vortex interaction, Compressible
National Category
Fluid Mechanics and Acoustics
Research subject
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263181DOI: 10.1007/s00193-012-0426-3ISI: 000320370500011Scopus ID: 2-s2.0-84878794754OAI: oai:DiVA.org:kth-263181DiVA, id: diva2:1367085
Note

QC 20191104

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

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