Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Experimental Study of Boundary Layer Transition on an Airfoil Induced by Periodically Passing Wake (I) -A Time-Averaged Characteristic-

주기적 후류 내의 익형 위 천이경계층에 관한 실험적 연구(I) -시간평균된 유동 특성-

  • 박태춘 (서울대학교 대학원 기계항공공학부) ;
  • 전우평 (서울대학교 정밀기계설계공동연구소 난류제어연구단) ;
  • 강신형
  • Published : 2001.06.01
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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 2$\times$10(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.

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References

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