Effects of short splitter plates on vortex shedding and sound generation in flow past two side-by-side square cylinders

Effects of short splitter plates on vortex shedding and sound generation in flow past two... Effects of short splitter plates on vortex shedding and sound generation in a low subsonic flow past two side-by-side square cylinders were examined experimentally at Reynolds numbers $${{{Re}}} = 1.0 - 3.3 \times 10^4$$ R e = 1.0 - 3.3 × 10 4 . The experiment was mainly conducted with the center-to-center distance between the two cylinders of 3.6d (d is the side length of a square cylinder) where vortex shedding from the two cylinders was synchronized with anti-phase relation, generating a quadrupole-like sound source that radiated in-phase sound in the far field. The results showed that the attachment of short splitter plates whose length (c) was ≤0.5d could reduce the sound pressure level of Aeolian tone significantly. Even with the shortest splitter plates of $$c{/}d=0.1$$ c / d = 0.1 , SPL was reduced by 6 dB at Mach number $$M_{\infty }=0.15$$ M ∞ = 0.15 . This was in contrast to the case of a single square cylinder, for which the attachment of a short splitter plate <0.2d led to no noticeable noise reduction. It was also shown that even when short splitter plates with a spanwise length as long as or less than the correlation length of shed vortices were attached on the two cylinders in a staggered array, the anti-phase vortex shedding and the corresponding in-phase sound radiation were still dominant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Effects of short splitter plates on vortex shedding and sound generation in flow past two side-by-side square cylinders

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2016 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-016-2227-4
Publisher site
See Article on Publisher Site

Abstract

Effects of short splitter plates on vortex shedding and sound generation in a low subsonic flow past two side-by-side square cylinders were examined experimentally at Reynolds numbers $${{{Re}}} = 1.0 - 3.3 \times 10^4$$ R e = 1.0 - 3.3 × 10 4 . The experiment was mainly conducted with the center-to-center distance between the two cylinders of 3.6d (d is the side length of a square cylinder) where vortex shedding from the two cylinders was synchronized with anti-phase relation, generating a quadrupole-like sound source that radiated in-phase sound in the far field. The results showed that the attachment of short splitter plates whose length (c) was ≤0.5d could reduce the sound pressure level of Aeolian tone significantly. Even with the shortest splitter plates of $$c{/}d=0.1$$ c / d = 0.1 , SPL was reduced by 6 dB at Mach number $$M_{\infty }=0.15$$ M ∞ = 0.15 . This was in contrast to the case of a single square cylinder, for which the attachment of a short splitter plate <0.2d led to no noticeable noise reduction. It was also shown that even when short splitter plates with a spanwise length as long as or less than the correlation length of shed vortices were attached on the two cylinders in a staggered array, the anti-phase vortex shedding and the corresponding in-phase sound radiation were still dominant.

Journal

Experiments in FluidsSpringer Journals

Published: Aug 20, 2016

References

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