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Experimental Study of Boundary Layer Transition on an Airfoil Induced by Periodically Passing Wake (I) -A Time-Averaged Characteristic-
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 Title & Authors
Experimental Study of Boundary Layer Transition on an Airfoil Induced by Periodically Passing Wake (I) -A Time-Averaged Characteristic-
Park, Tae-Chun; Jeon, U-Pyeong; Gang, Sin-Hyeong;
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 Abstract
Hot-wire measurements are performed in boundary layers developing on a NACA0012 airfoil over which wakes pass periodically. The Reynolds number based on chord length of the airfoil is 210(sup)5 and the wakes are generated by circular cylinders rotating clockwise and counterclockwise around the airfoil. This paper and its companion Part II describe the phenomena of wake-induced transition of the boundary layers on the airfoil using measured data; phase-and time-averaged streamwise mean velocities, turbulent fluctuations, integral parameters and wall skin frictions. This paper describes the background and facility together with results of time-averaged quantities. Due to the passing wake with mean velocity defects and high turbulence intensities, the laminar boundary layer is periodically disturbed at the upstream station and becomes steady-state transitional boundary layer at the downstream station. The velocity defect in the passing wake changes the local pressure at the leading of the airfoil, significantly affects the time-mean pressure distribution on the airfoil and eventually, has influence on the transition process of the boundary layer.
 Keywords
Wake-Induced Transition;Airfoil;Presure Gradient;Wall Skin-Friction Coefficient;
 Language
Korean
 Cited by
1.
주기적 통과 후류의 방향과 주파수가 익형 위 비정상 천이경계층에 미치는 영향,강신형;박태춘;전우평;

대한기계학회논문집B, 2002. vol.26. 5, pp.685-694 crossref(new window)
2.
주기적 후류 내의 익형 위 천이경계층에 관한 실험적 연구(II) -위상평균된 유동특성-,박태춘;전우평;강신형;

대한기계학회논문집B, 2001. vol.25. 6, pp.786-798 crossref(new window)
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