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장조원,손명환,은희봉,Chang, Jo-Won,Sohn, Myong-Hwan,Eun, Hee-Bong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.3
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$\times$10$_{4}$ and 2.2$\times$10$^{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.
장조원(Jo Won Chang),손명환(Myong Hwan Sohn),은희봉(Hee-Bong Eun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
An experimental study was carried out to investigate near-wake characteristic of an elliptic airfoil oscillating in pitch. The airfoil was sinusoidally pitched about the half chord point between -5℃ and +25˚ 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 3.3×10⁴ and 2.2×10^5, 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 either the laminar boundary layer or turbulent boundary layer separation.