Comparison of Serrated Helical Strakes in Suppressing the Vortex-Induced Vibrations of a Circular Cylinder

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Comparison of Serrated Helical Strakes in Suppressing the Vortex-Induced Vibrations of a Circular Cylinder

Assi, Gustavo R. S. / Crespi, Tommaso

The present work presents an experimental investigation of the suppression of vortex-induced vibrations of a circular cylinder by means of helical strakes. Experiments have been per- formed in a water channel at moderate Reynolds numbers. Three different types of helical strakes are compared: (i) a continuous helical strake, (ii) a helical strake with serrated blades and (iii) a helical strake with serrated blades but inverted (negative) in relation to the helical pitch of the strake. While the serrated- blade strake appeared as an improvement over the conventional model, the novel negative-bladed strake produced worse results, allowing for the return of resonant VIV. The most effective VIV suppressor was the bladed strake, achieving a reduction of 88% in the peak amplitude of vibration when compared to that of a bare cylinder during resonance. We conclude that simply inverting the local angle of attack of the individual blades (or fins) in relation to the helical pitch of the strake does not improve the performance of the strake in terms of VIV suppression.

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Document information

Title :

Comparison of Serrated Helical Strakes in Suppressing the Vortex-Induced Vibrations of a Circular Cylinder

Contributors:

Carreño Moreno, Vice Admiral Jorge Enrique (editor) / Vega Saenz, Adan (editor) / Carral Couce, Luis (editor) / Saravia Arenas, Jymmy (editor) / Assi, Gustavo R. S. (author) / Crespi, Tommaso (author)

Conference:

International Ship Design & Naval Engineering Congress ; 2019 ; Cartagena, Colombia March 13, 2019 - March 15, 2019
Pan American Congress of Naval Engineering, Maritime Transport and Port Engineering ; 2019 ; Cartagena, Colombia
March 13, 2019 - March 15, 2019

Published in:

Proceeding of the VI International Ship Design & Naval Engineering Congress (CIDIN) and XXVI Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL) ; Chapter : 24 ; 287-297

Publication date :

2020-03-11

Size :

11 pages

ISBN :

978-3-030-35963-8 , 978-3-030-35962-1

DOI :

https://doi.org/10.1007/978-3-030-35963-8_24

Type of media :

Article/Chapter (Book)