• Title, Summary, Keyword: 회류수조

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예선이 부선에 미치는 간섭영향 계측을 위한 회류수조 모형시험

  • Yun, Hyeon-Gyu;Choe, Seong-Min;Kim, A-Ram;Yeo, Dong-Jin
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.125-127
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    • 2010
  • 예부선 운항시 부선의 전방에 위치한 예선에 의한 유동 변화가 부선에 작용하는 동유체력 변화에 미치는 영향을 회류수조 모형시험을 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.

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실 해상모형시험을 이용한 고속 활주정의 선형시험기법 기초연구

  • Jang, Dong-Won;Park, Chung-Han;Jin, Song-Han;Sim, Sang-Mok;Jo, Hyo-Je
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.34-36
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    • 2007
  • 현재 모형선을 이용한 선형성능 검증방법에는 크게 2가지 방법이 있다. 첫째는 예인수조에서 예인전차를 이용하여 정수중에 배를 예인시켜 그에 따른 저항을 시험하는 방법이 있고, 둘째는 회류수조에서 배를 고정하여 물을 회전시켜 모형선의 저항을 측정하는 방법이 있다. 이와 같은 방법은 저속 및 대형선박을 검증하기 위해 계발된 방법들로 소형 고속어선 및 고속레저선박의 저항성능 평가를 수행하기 어려운 것이 현실이다. 예인전차의 예인속도와 회류수조 물의 유속이 소형 고속어선 및 고속레저선박의 속력에 미치지 못하기 때문이다. 따라서 고속을 요하는 선박의 저항성능 평가를 위해 새로운 방법 연구가 필요하다. 이에 고속선의 저항성능 시험을 위해 실 해상에서 일반 선박을 이용하여 예인하는 방법을 적용하여 저항시험을 수행하였으며 그에 맞는 시스템을 설계하였다.

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Correlative Experimental Study Between The Results of Circulating Water Channel and Towing Tank Tests (회류수조와 예인수조 시험결과의 상호관계의 실험적 연구)

  • Lee, K.J.;Ra, Y.K.
    • Journal of the Society of Naval Architects of Korea
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    • v.40 no.4
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    • pp.37-45
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    • 2003
  • Model tests using 2.0m model of the series 60 form( $C_{b}$= 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.s.

Two-Dimensional Wave Flume with Water Circulating System for Controlling Water Level (수위 조절 회류시스템을 갖춘 2차원 조파수조)

  • Oh, Sang-Ho;Lee, Dal Soo
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.30 no.6
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    • pp.337-342
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    • 2018
  • 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.

Design and Performance Analysis of a Small Circulating Water Channel for Ocean Engineering (해양공학용 소형 회류수조 설계 및 성능분석)

  • Yim, Young-Bae;Jeong, Uh-Cheul;Park, Chan-Won;Hong, Ki-Sup
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.198-202
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    • 2003
  • A small circulating water channel (CWC) for experiments ocean engineering is designed and made through the co-work of a company, MESTEC, and a college, Inha Technical Research Institute. General function of the elements of CWC are explained. The velocities in the test section are measured and analysed to estimate the performance of the CWC. The result of the velocity distribution is acceptable for experiments of ocean engineering.

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Calibration of Water Velocity Profile in Circular Water Channel Using Particle Image Velocimetry (PIV를 이용한 회류수조의 유속 분포 교정에 관한 연구)

  • Suh, Sung-Bu;Jung, Kwang-Hyo
    • Journal of Ocean Engineering and Technology
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    • v.25 no.4
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    • pp.23-27
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    • 2011
  • This experimental study was performed to find rpms of the impeller and the surface flow accelerator to make a uniform velocity vertical distribution in the circular water channel. PIV technique was employed to measure the water velocity profiles into the water depth from the free surface. The number of instantaneous velocity profiles was decomposed into mean and turbulence velocity components, and the distribution of velocity fluctuation and turbulence intensity were computed for each experimental condition. From these results, the velocity uniformity was quantitatively determined to present the flow quality in the measuring section of the circular water channel. It has been shown that the proper operation of the surface flow accelerator would make the uniform velocity profiles and reduce the velocity fluctuation near the free surface.

Bubble Wake Measurement by Acoustic Bubble Spectrometer Generated by Planing Hull at Circulating Water Channel (회류수조에서의 ABS에 의한 활주선 후류 기포항적계측)

  • Shin, Myung-Soo;Moon, Il-Sung;Nah, Young-In;Park, Jong-Chun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.1
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    • pp.55-61
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    • 2011
  • 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.

Analysis of the Characteristics of the Tidal Current Power Generation System Using PMSG and Water Tunnel (영구자석 동기발전기와 회류수조를 이용한 조류발전 시스템의 특성 해석)

  • An, Won-Young;Lee, Seok-Hyun;Kim, Gun-Su;Lee, Kang-Hee;Jo, Chul-Hee
    • New & Renewable Energy
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    • v.9 no.1
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    • pp.44-50
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    • 2013
  • In order to analyze the characteristics of tidal current power generation system, we measured the output power according to the stream velocity by a water tunnel system and a simulation in MATLAB/Simulink. The water tunnel system consisted of impeller tidal flow transducer and PMSG with rotor in the water. The simulation consisted of PMSG, the tidal current turbine, and back-to-back converter. Also, we simulated the characteristics of output power according to the change of blade length and angular velocity.

An Experimental Study on the Resistance Performance of Small Size Fishing Vessel (소형 연안어선의 저항성능에 관한 실험적 연구)

  • Kim, Do-Jung;Park, Je-Woong;Kim, Ju-Nam;Jeong, Uh-Cheul
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.40 no.4
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    • pp.304-310
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    • 2004
  • Resistance performance of small size fishing vessel is experimentally investigated to find out the effect of fore-body shape and trim for the better hull from development. The tests are performed for five different cases in the high speed circulating water channel(CWC). Wave patterns are observed to investigate the relation between the resistance performance and the wave characteristics.