설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제23권5호
  • /
  • Pages.365-374
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  • 2011
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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3차원 PIV에 의한 원형 개수로 유동의 속도분포 함수 측정

Measurements of Velocity Distribution Function in Circular Open Channel Flows by Stereoscopic PIV

  • 윤지인 (서울과학기술대학교 NID융합기술대학원) ;
  • 성재용 (서울과학기술대학교 기계공학과)
  • Yoon, Ji-In (Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) ;
  • Sung, Jae-Yong (Department of Mechanical Engineering, Seoul National University of Science and Technology)
  • 투고 : 2011.03.24
  • 심사 : 2011.04.25
  • 발행 : 2011.05.10
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초록

For the first time, the present study has measured the velocity distribution function in circular open channel flow in a three-dimensional shape using a stereoscopic PIV system. For a given channel slope, water depth was varied from 30% to 80% of the channel diameter. Then, the characteristics of the velocity distribution function was compared according to the change of the water depth. Unlike a rectangular channel, the present experiment exhibited quite different shapes in the velocity distribution function whether the water depth is higher than 50% or not. Especially, the position of maximum velocity in the central and side wall changes in a different manner for the water depth above 50%. By differentiating the velocity distribution function, local wall friction coefficient was evaluated as a function of wall position. If the water depth goes down, the difference between the maximum and minimum values in the local wall friction coefficient increases, and the averaged value a1so increases.

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참고문헌

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