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경사진 계단유동의 해석을 위한 벽면근접 난류모형의 적용
안종우,박태선,성형진,An, Jong-U,Park, Tae-Seon,Seong, Hyeon-Jin 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.6
A nonlinear low-Reynolds-number k-.epsilon. model of Park and Sung was extended to predict the flows over a step with inclined wall, where a boundary layer flow without separation and a separated and reattaching flow coexist. For a better prediction of the flows, a slight modification was made on the function of the wall damping( $f_{\mu}$) and the model constant ( $C_{{\epsilon}1}$) in the .epsilon.-equation. The model performance was validated by comparing the model predictions with the experiment. It was shown that the flows over a step with inclined wall are simulated successfully with the present model.ent model.
고용량 경사류용 동력계를 이용한 프로펠러 단독시험 특성의 실험적 연구
안종우,김기섭,박영하 대한조선학회 2019 大韓造船學會 論文集 Vol.56 No.2
In order to investigate Propeller Open Water (POW) characteristics for the high-speed propeller in Large Cavitation Tunnel (LCT), the high-capacity inclined-shaft dynamometer was designed and manufactured. Its measuring capacities of thrust and torque are ±2200N and ±120N-m, respectively. The driving motor is directly connected to the propeller shaft. Inclined angle of the propeller shaft can be adjusted up to ±10°. As the pressure inside LCT can be adjusted in the range of 0.1~3.0bar, we can carry out the POW test at high Reynolds number (above 1.0×106) without propeller cavitation and the cavitation test in uniform flow. After the new dynamometer setup in LCT, the Reynolds number variation test and propeller open-water test were conducted at the inclined angle of 0°and 6°. The present POW results of the new dynamometer are compared with those of the existing high-capacity dynamometer in LCT and of the dynamometer in the towing-tank. Through systematic model tests and comparison with their results, the performance of the new inclined-shaft dynamometer was verified. It is thought the POW test for the high-speed propeller should be better conducted at high Reynolds number.
8800TEU급 컨테이너선 프로펠러 추진효율 및 캐비테이션 성능향상 연구
안종우,김건도,김기섭,박영하,안해성,정영준,윤지현 대한조선학회 2017 大韓造船學會 論文集 Vol.54 No.6
In order to investigate propulsion efficiency and cavitation characteristics for expanded area ratio variation of the 8800TEU class container propeller, a series of performance tests were conducted at Large Cavitation Tunnel (LCT) and Towing Tank (TT) in KRISO. The cavitation test of the existing propellers (KP1029 & KP1030) was conducted using FRP model ship in LCT. On the basis of LCT test results, it was required to design propeller with better propulsion efficiency and cavitation performance. Two propellers (KP1171 & KP1172) with decreased expanded area ratio were designed on the basis of KP1029 propeller. The new design propellers showed higher efficiency than KP1029 and reasonable cavitation performance. In the future, they will be applied as the standard propeller for the propeller design of the large container ship. Through the performance test and prediction results for the new design propellers, it is thought that high-load propeller with better propulsion efficiency and cavitation performance will be developed constantly.
균일류에서 프로펠러 앞날 근처 관통구가 모형 프로펠러 캐비테이션에 미치는 영향
안종우,박일룡,박영하,김제인,설한신,김기섭 대한조선학회 2019 大韓造船學會 論文集 Vol.56 No.3
In order to investigate the influence of thru holes near leading edge of model propeller on cavitation behavior, a model propeller with thru holes was manufactured and tested at Large Cavitation Tunnel (LCT). The pressure distribution around the thru hole on propeller blade was numerically calculated to help understand the local flow characteristics related to cavitation behavior. The model propeller is a five bladed propeller which has 2 blades with thru holes and 3 blades with smooth surface. The cavitation observation tests were conducted at angles of 0°& 6°using an inclined-shaft dynamometer in LCT. There are big difference on the suction side cavitation behavior each other due to the existence of thru hole. While the blades with thou holes start generation of the sheet cavitation from the leading edge on the suction side, the blades with smooth surface generate the cloud cavitation from the mid-chord. Cavitation on the blades with thru holes shows more similar behavior to those of the full-scale propeller of which the pipe line for air injection is closed. The numerical analysis result shows that the sharp pressure drop occurs around thru holes on the blade. Consequently, the thru hole around leading edge stimulates the cavitation occurrence and stabilizes the cavitation behavior. Based on these results, the effect of thru holes on propeller cavitation behavior behind a model ship should be studied in the future.
대형 캐비테이션터널에서 Container선 프로펠러 캐비테이션 및 변동압력 특성연구
안종우,박영하,김건도,김기섭,백부근,유용완 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
In order to secure correlation of the cavitation performance between a full-scale ship and a model ship for the Container ship, the model ship with propeller and rudder is installed in the Large Cavitation Tunnel(LCT). cavitation behaviour is observed, fluctuating pressure is measured and its results are compared with those of the full-scale ship. The model test is conducted at the design-load condition, the same condition as that of the full-scale ship. The cavitation test conditions were decided considering the self-propulsion test results and stern wave height. On the basis of model-ship correlation analysis, it is considered that the experimental technique for the container ship was established.