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와류격자법에 의한 정상유동중의 상반회전 프로펠러 성능 해석
백광준(KWANG-JUN PAIK),서성부(SUNG-BU SUH),전호환(HO-HWAN CHUN) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.2
In this paper, a Vortex Lattice Method is used to predict the performances of a Contra-Rotating Propeller. Greeley and Kerwin's(1982) wake model is adopted instead of the exact trailing vortex geometry. The interaction of the two propellers is treated by the sense that the induction of one propeller upon the other propeller is averaged in the circumferential direction. Two single propellers (DTRC 4119 & DTRC 4842) are chosen and compared with the experimental and other numerical results published. Then, the computational results for three CRP's (4-0-4 CRP (DTRC 3686 + DTRC 3687A), 4-0-5 CRP (DTRC 3686 + DTRC 3849) & DTRC CRP (DTRC 5067 + DTRC 5068)) are compared with the experimental and numerical results published. The interaction of both propellers by the change of inflow velocity and circulation of each propeller is investigated.
성층화된 유체 내에서 내부파와 표면파의 파형 변화 실험을 위한 수치적 연구
이주한(Ju-Han Lee),김관우(Kwan-Woo Kim),백광준(Kwang-Jun Paik),구원철(Won-Cheol Koo),김영규(Yeong-Gyu Kim) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.3
Internal waves occur at the interface between two layers caused by a seawater density difference. The internal waves generated by a body moving in a two-layer fluid are also related to the generation of surface waves because of their interaction. In these complex flow phenomena, the experimental measurements and experimental set-up for the wave patterns of the internal waves and surface waves are very difficult to perform in a laboratory. Therefore, studies have mainly been carried out using numerical analysis. However, model tests are needed to evaluate the accuracy of numerical models. In this study, the various experimental conditions were evaluated using CFD simulations before experiments to measure the wave patterns of the internal waves and surface waves in a stratified two-layer fluid. The numerical simulation conditions included variations in the densities of the fluids, depth of the two-layer fluid, and moving speed of the underwater body.
민은홍(Eun-Hong Min),최하윤(Ha-Yun Choi),김영규(Young-Gyu Kim),백광준(Kwang-Jun Paik),구원철(Weon-Cheol Koo) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.1
The sea is stratified with water that has different densities because of pressure, temperature, and salinity. When conducting studies of internal waves in the ocean, the fluid is assumed to have layers that have discrete densities. This assumption is made because it is difficult to achieve layers that exhibit gradual changes in the density of the water. In this study, we used previous studies on ocean waves and their radiation issues in the density layer fluid to investigate the characteristics of internal waves in the ocean and their radiation patterns induced by a moving body in a stratified fluid. We also studied the difference in wave radiation between the density gradient layer and the discrete density layer. We found that the wave radiation patterns depended on the velocity of the moving body and the change in the density of the water. The crest apex shift phenomenon was observed in the density gradient in the layer of fluid.