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진동하는 타원형 에어포일의 근접후류 특성 연구
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저자명
장조원,손명환,은희봉,Chang. Jo-Won,Sohn. Myong-Hwan,Eun. Hee-Bong
간행물명
大韓機械學會論文集. Transactions of the Korean society of mechanical engineers. B. B
권/호정보
2003년|27권 3호|pp.334-346 (13 pages)
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

An experimental study was carried out to investigate near-wake characteristics of an elliptic airfoil oscillating in pitch. The airfoil was sinusoidally pitched about the half chord point between -5$^{circ}$and +25$^{circ}$angles of attack at the freestream velocities of 3.4 and 23.1 m/s. The corresponding Reynolds numbers based on the chord length were 3.3$ imes$10$_{4}$ and 2.2$ imes$10$^{5}$ , respectively. A hot-wire anemometer was used to measure the near-wake flow variables at the reduced frequency of 0.1. Ensemble-averaged velocity and turbulence intensity profiles were presented to examine the near-wake characteristics depending on the Reynolds number. The axial velocity deficit in the near-wake region tends to decrease with the increase in the Reynolds number as found in many stationary airfoil tests. Turbulence intensity in the near-wake region have a tendency to decrease with the -increase in the Reynolds number during the pitch-up motion, whereas it shows different feature during the pitch-down motion according to the separation characteristics.