Wall Shear Stress and Pressure Distributions of Developing Turbulent Oscillatory Flows in an Oscillator Connected to Curved Duct

가진 펌프에 연결된 곡관덕트에서 난류진동유동의 전단응력분포와 압력분포

  • 손현철 (순천제일대학 건축설비환경과) ;
  • 이홍구 (동아인재대학 컴퓨터응용설계과) ;
  • 이행남 (조선대학교 기계공학부) ;
  • 박길문 (조선대학교 기계공학부)
  • Published : 2001.12.01

Abstract

In the present study, flow characteristics of turbulent oscillatory flow in an oscillator connected to square-sectional $180^{\circ}$ curved duct are investigated experimentally. In order to investigate wall shear stress and pressure distributions, the experimental studies for air flows we conducted in a square-sectional $180^{\circ}$ curved duct by using the LDV system with the data acquisitions and the processing system. The wall shear stress at bend angle of the $150^{\circ}$ and pressure distribution of the inlet (${\phi}=0^{\circ}$) to the outlet (${\phi}=180^{\circ}$) by $10^{\circ}$ intervals of the duct are measured. The results obtained from the experiment are summarized as follows : wall shear stress values in the inner wall we larger than those in an outer wall, except for the phase angle (${\omega}t/{\pi}/6$) of 3, because of the intensity of secondary flow. The pressure distributions are the largest in accelerating and decelerating regions at the bend angle(${\phi}$) of $90^{\circ}$ and pressure difference of inner and outer walls is the largest before and after the ${\phi}=90^{\circ}$.

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