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

Journal of Fluid Science and Technology

Masataka SHIRAKASHI¹  Tsutomu TAKAHASHI¹  Naoto KATO¹  Mizuyasu KOIDE² 

[1] Nagaoka University of Technology;Niigata Sangyo University;

关键词: flow induced vibration;    flow control;    flow visualization;    wind tunnel experiment;    vibration suppression;    vibration generation;   

DOI  :  10.1299/jfst.1.126

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown