입자영상유속계를 이용한 가두리 망지의 난류강도 계측
Measurement of turbulence intensity of cage net using the particle imaging velocimetry
2
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
This study is aimed to analyze the hydrodynamic characteristics of the cage net in the circulating water channel. It visualized wake flows using a PIV (paricle imaging velocimetry) and analyzed the flow velocity distribution. In addition, the vorticity and turbulence intensity were analyzed from the wake flow distribution and compared changes by flow velocity. Results showed that the average turbulence intensity in the circulating water channel was very stable showing less than 1% in the range between 0.2 and 0.8 m/s. The drag coefficient affecting to the netting was estimated to be 1.35. The flow decreasing rate of the wake in the middle of the netting was 2.1% at the range of 0.2 m/s and it was constant at 6.6―6.9% over the range of 0.4 m/s irrespective of velocity increases. Finally, the change of turbulence intensity by netting and knot mesh could be confirmed. These results can be utilized as a basic information for the future research of flow characteristics by fishing nets and meshes.
Abstract
This study is aimed to analyze the hydrodynamic characteristics of the cage net in the circulating water channel. It visualized wake flows using a PIV (paricle imaging velocimetry) and analyzed the flow velocity distribution. In addition, the vorticity and turbulence intensity were analyzed from the wake flow distribution and compared changes by flow velocity. Results showed that the average turbulence intensity in the circulating water channel was very stable showing less than 1% in the range between 0.2 and 0.8 m/s. The drag coefficient affecting to the netting was estimated to be 1.35. The flow decreasing rate of the wake in the middle of the netting was 2.1% at the range of 0.2 m/s and it was constant at 6.6―6.9% over the range of 0.4 m/s irrespective of velocity increases. Finally, the change of turbulence intensity by netting and knot mesh could be confirmed. These results can be utilized as a basic information for the future research of flow characteristics by fishing nets and meshes.
참고문헌 (12)
- An HC, "Experimental study of flow characteristics in circulating Water channel of NFRDI", KTTC CWC Division Spring Workshop, pp.118~125 (2003), The Society of Naval Architects of Korea Abstracrt
- 배봉성, "PIV를 이용한 범포 주위의 유동장 특성", 한국어업기술학회지, 42(2), pp.86~96 (2006), 한국어업기술학회
- Cha BJ, "Analysis of the hydrodynamic characteristics of chain-link woven copper alloy nets for fish cages", Aquacult Eng, 56, pp.79~85 (2013)[DOI]
- Choi ES, "Turbulent flow measurements by laser velocimeter in circulating water channel", J Soc Naval Architecs Korea, 26, pp.1~8 (1989)
- Han BW, "HHI Circulating Water Channel Status", KTTC CWC Division Spring Workshop, pp.72~82 (2003), Society of Naval Architects of Korea Abstracts
- Kim TW, "Flow resistance of plane nettings for net cages", J Kor Soc Fish Tech, 34, pp.254~259 (2001)
- 송대호, "망지의 유체역학적 계수에 관한 연구", 한국어업기술학회지, 45(1), pp.34~45 (2009), 한국어업기술학회[DOI]
- Munson B.R, "Fundamentals of Fulid Mechanics", pp.556~565 (1996), Wiley
- Bouhoubeiny E, "Time-Resolved PIV investigations of the flow field around cod-end net structures", Fish Res, 108, pp.344~355 (2011)[DOI]
- Euro J Mech B, "Fluids", On the experimental study of the flow around a fishing net, Fluids, pp.2009, 28[DOI]
- Lewandowski R, "Numerical simulation of water flow around a rigid fishing net", Comput. Methods Appl. Mech Eng, 196, pp.4737~4754 (2007)[DOI]
- Fridman. A. L, "Calculations for fishing gear designs", pp.53~69 (1986), FAO, Fishing News Books Ltd