논문 상세보기
pp.48-53
발산진동인 플러터의 발현은 구조물의 붕괴와 직결되기 때문에, 기존의 대부분의 연구들은 이러한 파괴적인 진동현상을 안정화하는데 초점을 두어왔다. 한편, 고효율의 전력생산의 관점에서는 플러터 현상을 적극적으로 이용하여 풍력에너지를 추출하는 연구들도 수행되어 왔다. 본 연구에서는 변장비 5, 20의 구형단면을 이용하여 플러터 발전 시스템의 기본적인 효율성을 검토하였다. 풍동실험 및 해석적인 접근방법을 통해, 2차원 단면의 가진방향, 가진진동수와 고유진동수의 비, 비정상공기력 계수 등의 변수가 플러터 발전시스템의 효율성에 미치는 영향을 분석하였다.
Since the flutter instability is one of the divergent oscillations, its onset may directly induce the structural collapse. Therefore, many researches have been conducted to stabilize this destructive oscillation. On the other hand, researches of extracting the wind energy from flutter phenomenon have been performed from the viewpoint of positively utilizing the flutter phenomenon due to its high efficiency of power generation. In the previous study, the author examined the applicability of rectangular section having the side ratio, B/D of 20 to the power generation focusing on the amplitude ratio between heaving and torsional oscillations, which is based on the heaving branch mechanism of 2-dof coupled flutter. This paper examines the fundamental efficiency of flutter generation system using the rectangular sections with the side ratios, B/D of 5 and 20. The experimental and numerical investigations are performed to assess the influence of various aerodynamic parameters such as the directions of forced oscillation, the ratios of the forced frequency to the natural frequency, and the aerodynamic derivatives of rectangular sections on the efficiency of flutter generation system.
요 약
1. Introduction
2. Analytical Formulations
2.1 Amplitude Ratios According to the Directions ofForced Oscillations
2.2 Generated Energy
2.3 Supplied Energy
3. Wind Tunnel Tests
3.1 Effects of Forced Oscillation Directions
3.2 Effects of Aerodynamic Derivatives
4. Conclusions
References
