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이산화탄소를 이용한 가스터빈 블레이드 막냉각 특성 연구
김상권(Sang-Gwon Kim),이종철(Jong-Chul Lee),김윤제(Youn-Jea Kim) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
In order to cool the turbine blade under high temperature operating conditions, the film-cooling method is generally applied. In this study, CO2 was used as working fluid and it helped the operating system to prevent the loss of compressed air. The trapezoidal diffuser shape was adopted at the cross section of hole and the characteristics of heat flow with various working fluids were numerically studied. In particular, the different mixture ratios of CO2, such as various density ratios of 0.2, 0.8, and 1.0, respectively, were considered. Numerical results are graphically depicted with various conditions.
김상권(Sang Gwon Kim),신현석(Hyun Seok Sin),김태윤(Tae Yoon Kim),이재영(Jae Young Lee),김윤제(Youn-Jea Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
The particle-laden gas flow after combustion of industrial facilities and plants is transferred with the velocity of 16~40 ㎧. And the abrasion occurs at the curved pipe due to collision and friction between particles and pipe wall. In order to eliminate this defect, the cuπed pipe has been designed to form the vortex flow field in the lateral part where the flow direction is drastically converted. Analysis on the fluid-structure interaction was carried out on curved pipe angle of 45° and 90°. The governing equations for three-dimensional turbulent flow fields are discretized by the finite volume method and solved by the SIMPLE method. Results show that the designed model has better durability and reliability than the previous ones.
Organoclay로 보강된 NR/BR Blends의 기계적 특성
김상균 ( Kim Sang Gyun ),김상권 ( Kim Sang Gwon ),정경훈 ( Jeong Gyeong Hun ),변지영 ( Byeon Ji Yeong ),김원호 ( Kim Won Ho ) 한국고무학회 2004 엘라스토머 및 콤포지트 Vol.39 No.1
본 연구에서는 organoclay를 혼합한 NP/BP blend의 가황특성, 동적점탄성 및 기계적 물성을 carbon black 및 silica를 함유한 배합고무와 비교 평가 하였다. Solution 혼합법을 이용함으로써 광범위한 나노 복합체를 제조할 수 있었으며, 충전제의 함량은 10phr로 고정하였다. XRD실험으로 clay의 삽입 및 박리정도를 측정하였다. 통상적인 혼합법을 이용할 경우 clay의 박리 또는 삽입정도가 미약한 반면 solution 혼합법을 이용한 경우 광범위한 박리형태의 clay 배합고무를 얻을 수 있음을 확인하였다. Clay 배합고무는 carbon black 및 silica를 함유한 배합고무에 비해 높은 tan δ값을 나타내며, solution 혼합법을 이용할 경우 통상적인 혼합법에 의해 제조된 clay 배합고무에 비해 우수한 기계적 물성을 가짐을 확인할 수 있었다. The cure, viscoelastic and mechanical characteristics of organoclay filled NR/BR blends were studied and compared with the properties of carbon with the properties of carbon black and silica filled NR/BR blends. The nanocomposites with extensive exfoliation state can be fabricated by a solution mixing method. In the composites, the amount of filler content was fixed to 10 phr. Degree of intercalation and exfoliation was characterized by X-ray diffraction (XRD). XRD results indicated exfoliation of the silicate layers into the rubber matrix. While the degree of intercalation and exfoliation is lowered by the conventional mixing method, extensive exfoliation can be obtained by the solution mixing method. It was found that the clay filled NR/BR compound showed better viscoelastic (tan δ) and mechanical properties than the carbon black or silica filled NR/BR compounds.
전기증착법으로 제조된 다공성 텅스텐 산화물의 고대비 전기변색 특성
박성혁,모호진,임재근,김상권,최재효,이승현,장세화,차경호,나윤채,Park, Sung-Hyeok,Mo, Ho-Jin,Lim, Jae-Keun,Kim, Sang-Gwon,Choi, Jae-Hyo,Lee, Seung-Hyun,Jang, Se-Hwa,Cha, Kyung-Ho,Nah, Yoon-Chae 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.1
In this study, we synthesize tungsten oxide thin films by electrodeposition and characterize their electrochromic properties. Depending on the deposition modes, compact and porous tungsten oxide films are fabricated on a transparent indium tin oxide (ITO) substrate. The morphology and crystal structure of the electrodeposited tungsten oxide thin films are investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray photoelectron spectroscopy is employed to verify the chemical composition and the oxidation state of the films. Compared to the compact tungsten oxides, the porous films show superior electrochemical activities with higher reversibility during electrochemical reactions. Furthermore, they exhibit very high color contrast (97.0%) and switching speed (3.1 and 3.2 s). The outstanding electrochromic performances of the porous tungsten oxide thin films are mainly attributed to the porous structure, which facilitates ion intercalation/deintercalation during electrochemical reactions.