Acoustic characteristics of two circular cylinders forming a cross in uniform flow. Effect on noise reduction and flow around both cylinders.

Tomita, Yukio; Inagaki, Susumu; Suzuki, Shoji; Muramatsu, Hiroki

doi:10.1299/jsme1987.30.1069

Cited by 8 publications

(1 citation statement)

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“…Tomita et al (6) reported that the acoustic noise from a cylinder is suppressed by setting another cylinder downstream in cruciform arrangement with a certain gap between them as shown in Figure 1. Inspired by Tomita's work, the present authors found that the Kármán vortex excitation of the upstream cylinder in the cruciform system is effectively suppressed when the gap-to-diameter ratio is less than around 0.5.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cross-Sectional Configuration on the Longitudinal Vortex Excitation of the Upstream Cylinder in Cruciform Two-Cylinder System

Kato

Koide

Takahashi

et al. 2006

JFST

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In earlier works by the present authors, it was shown that a large cross-flow excitation is induced to a circular cylinder by setting another cylinder downstream in a cruciform arrangement with a certain gap between them, caused by longitudinal vortices shedding periodically around the crossing. In this work, influence of the cross-sectional configuration of cylinders forming a cross on the longitudinal vortex excitation was investigated by wind tunnel experiments. Three systems, i.e. a two-circular-cylinder, a circular-cylinder/strip-plate and a square-cylinder/strip-plate system, with essentially equal structural parameters were compared. In the case of the circular-cylinder/strip-plate system, the trailing vortex excitation occurs over much wider velocity region, while the necklace vortex excitation is indefinite, as compared with the two-circular-cylinder system. In the case of the square-cylinder/strip-plate system, vortex excitation occurs in a certain velocity region of the galloping of single cylinder attributed to the necklace vortex.

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Section: Introductionmentioning

confidence: 99%