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이철재,Lee, Cheol-Jae 해양환경안전학회 2006 해양환경안전학회지 Vol.12 No.4
이 연구에서는 실제선박의 후드룸을 1/15로 축소한 비대칭 입출구를 갖는 장방형 모델을 대상으로 가시화 실험을 수행하고 내부의 유동 특성을 고찰하고자 하였다. 속도장의 계측은 CACTUS'2000을 이용한 2차원 PIV기법으로 하였으며 4개의 계측영역을 설정하여 계측한 결과 유동장의 환기구조를 지배하는 흐름은 유동장의 좌측 벽면의 흡기구로부터 대각방향의 우측상부로 흐르는 나선형의 'L'형 유동이었다. 또한 주 흐름의 영향으로 유동장의 중앙부분에 강제와류형태의 재순환 흐름이 존재하였다. In this study, a scaled model chamber was built to investigate ventilation characteristics of the hood room in LNG carrier. Experimental study was performed in model by visualization equipment with laser apparatus. Four different kinds of measuring area were selected as experimental condition Instant simultaneous velocity vectors at whole field were measured by 2-D PIV system and its software adopting two-frame grey-level cross correlation algorithm. The flow pattern reveals the large scale counter-clockwise forced-vortex rotation at center area.
실내공기 제어를 위한 사각공간내의 혼합대류에 관한 연구
이철재(Cheol-Jae Lee),정한식(Han-Shik Chung),권순석(Sun-Sok Kwon) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.4
The Numerical and experimental studies on the mixed convection of a rectangular enclosure for indoor air control has been studied numerically using the finite volume method and experimentally with holographic interferometry and Laser apparatus. The parameters studied here are Pr= 0.71, 30≤Re≤600, 700≤Gr≤100000 and the positions of an outlet. The results show streamlines, isotherms, velocity distributions and photograph of holographic interferometry and streamlines. It is found that the minimum cell occurs at Re=100,Gr=10000. The mean Nusselt numbers can be expressed by the correlation equation Nu=CㆍGr<SUP>a</SUP> Re<SUP>b</SUP>. The comparison of numerical and experimental results shows a good agreement.
이철재(Cheol-Jae Lee),임정선(Jeong-Sung Lim),조대환(Dae-Hwan Cho) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
In wide angle diffuser, the increasement of cross-sectional area so rapidly cause possibly separate from the diffuser wall and forming areas of backflow. The flow characteristics of wide angle diffuser with guide damper was investigated for three kind of inclined angle(α=70。, 10.5。 and 14。)of guide damper. Judging from the results, guide damper can be used as an effective means of improvement for diffuser performance and inclined angle of α=10.5°was through to be the best among three cases.