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2019 Vol.6, Issue 3

Original Article

Measurements of Void Fraction of Aerated Flows over Hydraulic Structures

수공구조물에 의한 폭기 흐름의 기포분율 측정

Yong-Uk Ryu1
,
Nam-Joo Lee2*
류 용욱1
,
이 남주2*
1Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea
2School of Civil, Urban, and Environmental Engineering, Kyungsung University, Busan 48434, Korea
1부경대학교 해양공학과
2경성대학교 건설환경도시공학부
* Corresponding Author
30 September 2019. pp. 137-144
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Abstract

This study carried out experimental investigation through measurements of void fraction of aerated flows generated near hydraulic structures. The imaging technique applying the shadowgraphy method was employed to quantify aeration by measuring void fractions. Aerated flows in the vicinity of a sloped weir and a stepped weir were measured using the imaging technique. Spatially distributed void fraction that was possible from gray images gives aeration rate of the flows over hydraulic structures with eco-environmental function. Aeration over the stepped weir takes place more strongly and widely in its front slope and downstream compared to the sloped weir.

Keywords
Aeration
Image technique
Sloped weir
Stepped weir
Void fraction

본 연구는 수공구조물 주변에서 발생하는 폭기 흐름의 기포분율을 측정하는 실험 연구를 수행하였다. 그림자기법을 이용한 영상측정기법을 적용하여 기포분율을 측정하고 이를 통해 폭기 정도를 정량화하였다. 제안된 영상기법을 이용하여 경사보와 계단보 주변에서 발생하는 흐름을 측정하였다. 흑백 영상으로부터 얻어진 공간적으로 분포한 기포분율은 친환경 수공구조물 주변에서 폭기 정도를 제시할 수 있었다. 얻어진 결과로부터 계단보의 전면경사부와 하류부에서 상대적으로 강한 폭기 현상이 발생함을 알 수 있었다.

키워드
폭기
영상기법
경사보
계단보
기포분율
References
1
Ryu, Y. and Jung, T. 2015. Application of image technique and optical fiber sensor for air-water mixture flow. Journal of Korean Water Resources Association 48(7): 535-543. (in Korean)
10.3741/JKWRA.2015.48.7.535
2
Chanson, H. 2001. Teaching hydraulic design in an Australian undergraduate civil engineering curriculum. Journal of Hydraulic Engineering 127(12): 1002-1008.
10.1061/(ASCE)0733-9429(2001)127:12(1002)
3
Chang, K.A., Lim, H.J., and Su, C.B. 2002. A fibre optic fresnel ratio meter for measurements of solute concentration and refractive index change in fluids. Measurement Science and Technology 13: 1962-1965.
10.1088/0957-0233/13/12/321
4
Ryu, Y, Chang, K.A., and Lim, H.J. 2005. Use of bubble image velocimetry for measurement of plunging wave impinging on structure and associated greenwater. Measurement Science and Technology 16: 1945-1953.
10.1088/0957-0233/16/10/009
Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 6
  • No :3
  • Pages :137-144
  • Received Date : 2019-08-23
  • Revised Date : 2019-08-29
  • Accepted Date : 2019-08-29
  • DOI :https://doi.org/10.17820/eri.2019.6.3.137
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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