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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(1); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(1): 9-16. doi: https://doi.org/10.9765/KSCOE.2019.31.1.9
블레이드가 설치된 조류발전용 쉬라우드 시스템 내 유속 변화 분석
이욱재1, 한석종2, 정신택1, 이상호2
1원광대학교 토목환경공학과
2원광대학교 기계자동차 공학부
Analysis of Flow Velocity Change in Blade Installed Shroud System for Tidal Current Generation
Uk Jae Lee1, Seok Jong Han2, Shin Taek Jeong1, Sang Ho Lee2
1Department of Civil and Environmental Engineering, Wonkwang University, Iksandae-ro 460, Iksan, Jeonbuk 54538, Korea
2Division of Mechanical and Automotive Engineering, Wonkwang University
Corresponding author: Shin Taek Jeong ,Tel: +82-63-850-6714, Fax: +82-63-850-7357, Email: stjeong@wonkwang.ac.kr
Received: January 28, 2019;  Revised: February 20, 2019.  Accepted: February 21, 2019.
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ABSTRACT
Flow velocity changes in the shroud system for tidal current power generation due to experimental flow velocities and blade geometry changes were analyzed by hydraulic experiment and numerical simulation. Through the hydraulic experiment, flow velocities at inlet of shroud system and RPM according to blade geometry were measured, and numerical simulation was used to analyze flow velocity changes in shroud. When the experimental flow velocity was increased by about 28% and the shape of the airfoil was applied, the measured flow velocity at the shroud inlet tended to increase by up to about 56%. On the other hand, when airfoil-shaped blades were installed, the flow velocity at the inlet tended to increase by up to 14% compared to conventional blades, and RPM was also the highest at the same conditions. The hydraulic experiment and numerical simulation results showed an error of about 13%, and the trends of the flow velocity changes in each result are similar. Numerical simulation of the flow velocity changes in the shroud showed that the flow velocity tended to increase 1.7 times at the front of the blade compared to the inlet. The results of the flow velocity change analysis in the shroud system obtained from this study will provide the basic data necessary for the development of efficient shroud system for tidal current power generation.
Keywords: tidal current power generation, shroud system, hydraulic experiment, numerical simulation, RPM, change of flow velocity
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