Flume experiments for turbulent flow around a spur dike

Jeongsooka Jeon; Seokkoo Kang

doi:10.3741/JKWRA.2016.49.8.707

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Flume experiments for turbulent flow around a spur dike 수제 주위의 난류 특성 변화에 대한 실험 연구

31 August 2016. pp. 707-717

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Abstract

In this study we carried out laboratory experiments to investigate the three-dimensional turbulent flows around a spur dike installed in a straight open channel flume. The experiments are conducted under the two different Froude numbers, 0.100 and 0.185. The three-dimensional instantaneous velocities are measured using the Acoustic Doppler Velocimetry (ADV) to obtain the time-averaged velocities and the turbulence stresses. The measured flow field reveal the existence of the recirculation zones downstream of the dike, which is characterized by high turbulence stresses near its boundaries. The results show that although the overall mean flow patterns between the low and high Froude number cases are very similar to each other, there exist moderate changes in the maximum dimensionless turbulence stresses and the maximum dimensionless bed shear stress with the increase of the Froude number.

Keywords

Spur Dike

Turbulent Flow

Reynolds Stress

Bed Shear Stress

본 연구에서는 직선 개수로 내에 설치된 수제 모형 주위에서 발생하는 난류 흐름의 특성을 알아보기 위하여 수리모형실험을 수행하였다. 실험은 Froude 수가 0.100과 0.185인 두 가지 흐름 조건에서 이루어졌다. 시간평균유속과 난류 응력을 구하기 위하여 초음파 유속계를 이용하여 3차원 순간 유속을 측정하였다. 실험 결과, 수제 하류에서 난류 응력이 큰 재순환 영역이 존재하는 것으로 확인하였다. Froude 수가 큰 경우와 작은 경우의 전반적인 평균 유속 분포는 유사하게 나타났으나, 최대 무차원 난류 응력과 최대 무차원 바닥 전단응력은 Froude 수가 증가할수록 차이를 보였다.

키워드

수제

난류

레이놀즈 응력

바닥 전단응력

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 49
No :8
Pages :707-717
Received Date : 2016-06-24
Revised Date : 2016-07-15
Accepted Date : 2016-07-26
DOI :https://doi.org/10.3741/JKWRA.2016.49.8.707

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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