인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Enhancing aerodynamic efficiency and self-starting torque in Darrieus-type Vertical Axis Wind Turbines (VAWTs) is essential for power generation under low and intermittent wind conditions. This study presents a systematic evaluation of Plain Flap (PF), Gurney Flap (GF), and hybrid Plain Gurney Flap (PGF) modifications applied to the NACA 0015 aerofoil. Two-dimensional Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations using the SST k-ω model were conducted across a tip-speed-ratio (TSR) range of 0.2-4.5 and Reynolds numbers ((Re = 5.4 × 10<sup>4</sup>-2.7 × 10<sup>5</sup>), with results validated by prototype testing. The optimal 0.5c, 10° PF configuration demonstrated the most robust and stable performance across the full operational range. At low TSR (0.2-0.5), the PF significantly improved mean Cm by 30-40% and Cp by 40% by increasing effective camber. While the 0.015c PGF generated higher instantaneous torque, it incurred larger downwind losses. At moderate TSR (0.8-1.5), PF and PGF achieved similar high Cp gains (40-50%). Beyond TSR = 2.0, the PF maintained superior aerodynamic stability and consistent efficiency, whereas the PGF performance declined due to drag penalties. Prototype testing conclusively confirmed these numerical trends, with PF blades increasing shaft speed by up to 51% at 5.5 m/s compared to the baseline. Overall, PF and PGF configurations effectively mitigate weak self-starting and low efficiency, providing a validated passive-flap design pathway for efficient small-scale and hybrid solar-wind energy systems.
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오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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