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이귀주,라영곤 대한조선학회 2003 大韓造船學會 論文集 Vol.40 No.4
Model tests using 2.0m model of the series 60 form(= 0.6) were carried out in the Circulating Water Channel (CWC) in the Chosun University (CU, Korea) for the purpose of a correlative study with Towing Tank (TT). Resistance, propeller open water, self propulsion and wake survey tests were carried out and the results were extrapolated to the ship scale. These results were compared with the extrapolated ship values based on the model test of 7.0m model in the TT at the Korea Research Institute of Ships and Ocean Engineering (KRISO, Korea). The CWC test results were correlated with the results of the towing tank tests.
오상호,이달수 한국해안,해양공학회 2018 한국해안해양공학회 논문집 Vol.30 No.6
인공 파도 발생장치를 갖춘 2차원 조파수조는 해안공학 분야 수리실험을 위한 핵심 연구시설이다. 최근 국내에 길이 50 m의 2차원 조파수조가 새로 구축되었다. 이 조파수조에는 수조 바닥 자체에 경사 구간을 두었고, 최신 조파이론이 반영된 조파시스템을 도입하였으며, 수위 조절 회류 시스템을 갖추었다. 본 논문에서는 새로 구축된2차원 조파수조의 이러한 기술적 특징 및 세부 내용을 소개하였다. Wave flume that enables generating water waves is a core research facility for physical experiment related to coastal engineering works. Recently, a new wave flume of 50 m length was constructed in Korea. The wave flume has a sloped section on its bottom. A novel wave generating system incorporating most-updated wave maker theory was introduced to the flume. In addition, water circulating system for adjusting water level was installed beneath the flume. These technical features and detailed specifications of the wave flume are described in this paper.
예선이 부선에 미치는 간섭영향 계측을 위한 회류수조 모형시험
윤현규,최성민,김아람,여동진 한국항해항만학회 2010 한국항해항만학회 학술대회논문집 Vol.2010 No.추계
예부선 운항시 부선의 전방에 위치한 예선에 의한 유동 변화가 부선에 작용하는 동유체력 변화에 미치는 영향을 회류수조모형시험을 통하여 분석하였다. 이를 위하여 예선에 의한 간섭영향계수를 예부선의 상태변수와 간격 거리 등의 함수로 모델링하고, 모형시험 조건을 도출하였다. 회류수조 모형시험을 수행하여 예부선 상태에 따른 간섭력 계측, 파형 변화 현상 해석, 예선 간섭 유체력 분석을 수행하였다.
신명수,문일성,나영인,박종천,Shin, Myung-Soo,Moon, Il-Sung,Nah, Young-In,Park, Jong-Chun 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
This paper presents bubble wake measurement results generated by the planing hull. The bubble was generated by SNAME TMB model(No. 4876) with hard chine at the CWC(Circulating Water Channel). ABS(Acoustic Bubble Spectrometer) was used to measure bubble wake measurement. The manufactured model is one meter in length and uniform velocity to generate the bubble at CWC is 3m/s, relatively higher speed than conventional hull form. Measurements were performed successfully and measured results show well the general characteristics of bubble wake generated by planing hull. Furthermore, experimental equations are proposed for the practical use.
대각도 받음각을 갖는 무인잠수정에 작용하는 동유체력 특성에 관한 실험적 연구
배준영(Jun-Young Bae),김정중(Jeong-Jung Kim),손경호(Kyoung-Ho Sohn) 한국항해항만학회 2011 한국항해항만학회지 Vol.35 No.3
회류수조에서의 대각도 정적(static) 모형실험을 통해 Manta형 무인잠수체에 작용하는 동유체력을 측정하였으며, 동유체력에 미치는 Reynolds수의 영향을 고찰하였다. 이를 위해 동유체력을 cross-flow drag과 양력(lift force)으로 성분 분석을 하였으며, 양력 성분에는 Reynolds수의 영향을 무시하고, cross-flow drag 성분에만 Reynolds수의 영향을 고려하였다. 그 후 이들 두 성분을 다시 합성함으로써 실물 무인잠수정에 작용하는 동유체력의 추정 기법을 제시하였다. The authors adopt the Unmanned Undersea Vehicle(UUV), the shape of which is like a manta. They call here it Manta UUV. Manta UUV has been designed from the similar concept of the UUV called Manta Test Vehicle(MTV), which was originally built by the Naval Undersea Warfare Center of USA(Lisiewicz and French, 2000; Simalis et al., 2001; U.S. Navy, 2004). The present study deals with the effect of Reynolds numbers on hydrodynamic forces acting on Manta UUV at large angles of attack. The large angles of attack cover the whole range of 0 to ± 180 degrees in horizontal plane and in vertical plane respectively. Static test at large attack angles has been carried out with two Manta UUV models in circulating water channel. The authors assume that the experimental results of hydrodynamic forces (lateral force, yaw moment, vertical force and pitch moment) are analyzed into two components, which are lift force component and cross-flow drag component. First of all, Based on two dimensional cross-flow drag coefficient at 90 degrees of attack angle, the cross-flow drag component at whole range of attack angles is calculated. Then the remainder is assumed to be the lift force component. The only cross-flow drag component is assumed to be subject to Reynolds number.entstly the authors suggest the methodology to predict hydrodynamic derivertives acting on the full-scale Manta UUV.
정광효(Kwang-Hyo Jung),서성부(Sung-Bu Suh),박성부(Sung-Boo Park) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
This study is to calibrate the surface flow accelerator to make a uniform vertical velocity distribution. This experiment is carried out circulating water channel with employing PIV technique. The vertical and horizontal velocity distributions are illustrated for two different impeller rpm with varying surface flow accelerator rpm. This experimental approach suggests how to measure, the velocity uniformity near free surface. Also, the velocity uniformity could be quantified in direction vertical and horizontal.