한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제38권8호
  • /
  • Pages.691-698
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  • 2005
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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정체수역으로 방류된 수평병합부력제트의 진동운동에 대한 실험적 연구

Experimental Investigation on the Flapping Motions of Horizontal Merging Buoyant Jet Discharged into Stationary Ambient Water

  • 류시완 (창원대학교 공과대학 토목공학과) ;
  • 서일원 (서울대학교 공과대학 지구환경시스템공학부)
  • Lyu, Si-Wan (Dept. of Civil Engrg., Changwon National Univ.) ;
  • Seo, Il-Won (School of Civil, Urban & Geosystem Engrg., Seoul National Univ.)
  • 발행 : 2005.08.01
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초록

본 연구에서는 정체수역으로 방류되는 수평병합부력제트에 대한 실험을 수행하여, 평민제트의 고유한 특징으로만 알려져 왔던 진동운동에 대해 구명하고자 하였다. 연구결과, 진동운동은 병합부력제트에서도 확인되었으며, 특히 병합천이역 시점에서부터 관찰되었다. 흐름의 국부적인 특성치와 진동운동을 야기하는 와의 통과빈도와의 관계를 나타내는 Strouhal수는 병합천이역에서 변화하여 병합이 완전히 이루어진 후에는 일정한 값으로 수렴하는 것으로 관측되었다. 평면제트에 대해서 구해진 진동운동의 특성이 병합천이역과 국부흐름특성치의 변화를 고려할 경우, 병합부력제트의 진동운동도 나타낼 수 있음을 알 수 있었다.

A series of experiments has been performed to investigate the flapping motion, which has been generally considered as an intrinsic characteristic of plane flow, of the horizontal merging buoyant jet discharged into stationary ambient water. For Horizontal merging buoyant jets, the flapping motions has been observed and the average onsets of flapping motion coincided with the start of merging transition. The Strouhal number, which describes the measure of frequency of vortices on the flow boundary with respect to the local properties of the flow, varies and converges to a constant value over merging transition. Considering the merging transition and the variation of local flow properties, the characteristics of flapping motion of plane flow can be applied to merging buoyant jets.

키워드

참고문헌

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