Experimental study on passive flow control of circular cylinder via perforated splitter plate

IF 1.3 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Wind and Structures Pub Date : 2021-06-01 DOI:10.12989/WAS.2021.32.6.613

Serdar Şahin, T. Durhasan, Engin Pinar, H. Akilli

{"title":"Experimental study on passive flow control of circular cylinder via perforated splitter plate","authors":"Serdar Şahin, T. Durhasan, Engin Pinar, H. Akilli","doi":"10.12989/WAS.2021.32.6.613","DOIUrl":null,"url":null,"abstract":"Present experimental investigation aims to reduce the shedding of vortex in the near wake region of a circular \ncylinder using a perforated splitter plate. Perforated plates were placed in the wake region of the cylinder and aligned with the streamwise direction. The length of the plates was equal to the diameter of the cylinder. Different plate porosities and locations were examined and obtained results were compared to the baseline cylinder. Flow measurements downstream of the cylinder were performed in a water channel by employing a particle image velocimetry technique (PIV) at a Reynolds number of Re=5x103. It is observed that the effect of the porosity on the flow characteristics of the cylinder depends on the location of the plate. The strength of shear layers and flow fluctuations in the near wake region of the cylinder are considerably diminished by the perforated splitter plate. It is found that the porosity of e=0.3 is the most effective control element for gap ratio of G/D=0.5. \nOn the other hand, proper gap ratio is determined as G/D=2 for porosity of e=0.7. It is concluded in the present study that the perforated splitter plate could be used as alternative passive flow control technique in order to reduce vortex shedding of the cylinder.","PeriodicalId":51210,"journal":{"name":"Wind and Structures","volume":"32 1","pages":"613"},"PeriodicalIF":1.3000,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Wind and Structures","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.12989/WAS.2021.32.6.613","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 2

Abstract

Present experimental investigation aims to reduce the shedding of vortex in the near wake region of a circular cylinder using a perforated splitter plate. Perforated plates were placed in the wake region of the cylinder and aligned with the streamwise direction. The length of the plates was equal to the diameter of the cylinder. Different plate porosities and locations were examined and obtained results were compared to the baseline cylinder. Flow measurements downstream of the cylinder were performed in a water channel by employing a particle image velocimetry technique (PIV) at a Reynolds number of Re=5x103. It is observed that the effect of the porosity on the flow characteristics of the cylinder depends on the location of the plate. The strength of shear layers and flow fluctuations in the near wake region of the cylinder are considerably diminished by the perforated splitter plate. It is found that the porosity of e=0.3 is the most effective control element for gap ratio of G/D=0.5. On the other hand, proper gap ratio is determined as G/D=2 for porosity of e=0.7. It is concluded in the present study that the perforated splitter plate could be used as alternative passive flow control technique in order to reduce vortex shedding of the cylinder.

查看原文本刊更多论文

多孔分流板对圆柱被动流动控制的实验研究

目前的实验研究旨在使用穿孔分流板来减少圆柱体近尾流区域的涡流脱落。穿孔板被放置在圆柱体的尾流区域，并与流向对齐。板的长度等于圆柱体的直径。检查不同的板孔隙率和位置，并将获得的结果与基线圆柱体进行比较。采用粒子图像测速技术（PIV）在雷诺数Re=5x103的条件下在水道中对圆柱体下游的流量进行测量。观察到孔隙率对圆柱体流动特性的影响取决于板的位置。穿孔分流板大大降低了圆柱体近尾流区域的剪切层强度和流动波动。研究发现，对于G/D=0.5的间隙比，e=0.3的孔隙率是最有效的控制因素。另一方面，对于e＝0.7的孔隙率，适当的间隙比被确定为G/D＝2。在本研究中得出的结论是，穿孔分流板可以作为被动流动控制技术的替代方案，以减少圆柱体的涡流脱落。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Wind and Structures 工程技术-工程：土木

CiteScore

2.70

自引率

18.80%

发文量

审稿时长

>12 weeks

期刊介绍： The WIND AND STRUCTURES, An International Journal, aims at: - Major publication channel for research in the general area of wind and structural engineering, - Wider distribution at more affordable subscription rates; - Faster reviewing and publication for manuscripts submitted. The main theme of the Journal is the wind effects on structures. Areas covered by the journal include: Wind loads and structural response, Bluff-body aerodynamics, Computational method, Wind tunnel modeling, Local wind environment, Codes and regulations, Wind effects on large scale structures.