Investigation of enhanced peak lift performance and stall angle delay by attachment of Vortex Generators on blade surfaces of Vertical Axis Ocean Current Turbine

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering Pub Date : 2025-03-12 DOI:10.1016/j.oceaneng.2025.120762

Dendy Satrio , Erwandi , Daif Rahuna

{"title":"Investigation of enhanced peak lift performance and stall angle delay by attachment of Vortex Generators on blade surfaces of Vertical Axis Ocean Current Turbine","authors":"Dendy Satrio , Erwandi , Daif Rahuna","doi":"10.1016/j.oceaneng.2025.120762","DOIUrl":null,"url":null,"abstract":"<div><div>Efforts to enhance the efficiency and self-starting capability of Vertical Axis Ocean Current Turbine (VAOCT) at low ocean current speeds have recently become a major area of study. As the VAOCT blades rotate, it experiences varying angles of attack (α) relative to the ocean's current direction. This study investigated the impact of Vortex Generators (VG) on the static NACA 0021 hydrofoil VAOCT blade by varying VG height (h) within an α range of 0°–180°. Computational Fluid Dynamics (CFD) simulations were employed for analyzing the case configurations, providing new insights modified VAOCT with VG on its blade surface. The performance of the NACA 0021 with VG showed improvement. The coefficient of lift (Cl) increased by up to 20.2% for the VG configuration with h 1% C at an α of 20°. For the VG with h 2.5% C, the Cl increased by up to 8%. The stall angle was delayed from 20° to 25° for the VG with h 1% C and from 20° to 30° for the VG with h 2.5% C. The flow over the blade with VG also qualitatively improved, evidenced by better pressure and velocity contours. These results indicate that VG can positively enhance VAOCT performance.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120762"},"PeriodicalIF":4.6000,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ocean Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0029801825004779","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

Efforts to enhance the efficiency and self-starting capability of Vertical Axis Ocean Current Turbine (VAOCT) at low ocean current speeds have recently become a major area of study. As the VAOCT blades rotate, it experiences varying angles of attack (α) relative to the ocean's current direction. This study investigated the impact of Vortex Generators (VG) on the static NACA 0021 hydrofoil VAOCT blade by varying VG height (h) within an α range of 0°–180°. Computational Fluid Dynamics (CFD) simulations were employed for analyzing the case configurations, providing new insights modified VAOCT with VG on its blade surface. The performance of the NACA 0021 with VG showed improvement. The coefficient of lift (C_l) increased by up to 20.2% for the VG configuration with h 1% C at an α of 20°. For the VG with h 2.5% C, the C_l increased by up to 8%. The stall angle was delayed from 20° to 25° for the VG with h 1% C and from 20° to 30° for the VG with h 2.5% C. The flow over the blade with VG also qualitatively improved, evidenced by better pressure and velocity contours. These results indicate that VG can positively enhance VAOCT performance.

查看原文本刊更多论文

垂直轴海流涡轮叶片表面附着涡发生器提高峰值升力性能和失速角延迟的研究

提高低海流速度下垂直轴海流涡轮的效率和自启动能力已成为近年来研究的一个重要领域。当VAOCT叶片旋转时，它会经历相对于海洋当前方向的不同攻角（α）。在0°~ 180°α范围内，通过改变涡发生器高度(h)，研究了涡发生器（VG）对NACA 0021水翼静态voct叶片的影响。利用计算流体动力学（CFD）模拟分析了机壳结构，为叶片表面添加VG的voct提供了新的见解。加入VG后，NACA 0021的性能得到了改善。当α为20°时，当温度为1%时，升程系数（Cl）提高了20.2%。对于温度为2.5%的VG， Cl增加了8%。当温度为1%时，叶片失速角从20°延迟到25°，当温度为2.5%时，叶片失速角从20°延迟到30°，叶片上的流动也得到了质的改善，压力和速度轮廓得到了改善。这些结果表明，VG对voct性能有积极的促进作用。

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

Ocean Engineering 工程技术-工程：大洋

CiteScore

7.30

自引率

34.00%

发文量

2379

审稿时长

8.1 months

期刊介绍： Ocean Engineering provides a medium for the publication of original research and development work in the field of ocean engineering. Ocean Engineering seeks papers in the following topics.