http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
나상권(S.K. Na),심재경(J.K. Shim),박희호(H.H. Park),이성준(S.J. Lee),전승배(S.B. Chen) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
It is very difficult to understand and estimate the heat transfer and flow characteristics in the combustor, which is one of main components in the Auxiliary Power Unit (APU), because its flow filed has very complex structure. In this paper, specified is characteristics of injection and flow through different air holes in the liner, which consist of large circular holes, film cooling holes, and tangential air swirl holes. The durability of the liner depends on whether the surface of the liner is exposed to the hot gas over 1000℃ of a temperature or not. It is proved that the locations of hot spots estimated from the calculation using CFD are matched well with that from the test. In this study, CFD simulations were performed to examine the heat transfer and temperature distributions in and about a liner wall with film cooling on the wall. This computational study is based on the ensemble average continuity, compressible Navier-Stokes, energy, and PDF combustion equations closed by the standard k-ε turbulence model with standard wall functions for the gas phase and the Fourier equations for conduction in the solid phase.
에스테르 교환 반응 및 Poly(trimethylene trerephthalate) 의 축중합 반응 속도에 관한 연구
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.1
The transesterification of dimethyl terephthalate(DMT) with 1,3-propane diol(PDO) was invesigated in the presence of catalyst, titanium(IV) butoxide, at 175∼190℃. The degree of esterification reaction was measured by the output of methanol which was distilled from the reactor. The polycondensation of PTT was also investigated by the required current that mixing speed was kept constant, in the presence of titanium(IV) butoxide and thermal stabilizer at 260∼280℃.
폴리트리메틸렌 테레프탈레이트 / 폴리에틸렌 나프탈레이트 용융 블렌드
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.1
Melt blends of poly(trimethylene terephthalate)(PTT) and poly(ethylene 2,6-naphthalate)(PEN) with various compositions were prepared at 275℃ using 40rpm for various mixing times. Transesterification and misibility of blends of PTT with PEN was studied by dynamic mechanical thermal analysis(DMTA) and NMR.
폴리트리메틸렌텔레프탈레이트 / 폴리비스페놀카보네이트 용융 블렌드 (1)
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.2
Melt blends of poly(trimethylene terephthalate), PTT and Poly(Bisphenol A carbonate), PC with various compositions were prepared at 275℃ using 40rpm for 60min. Thermal properties of PTT/PC blends have been studied by differential scanning calorimetry(DSC) and dynamic mechanical thermal analysis(DMTA). The glass transition temperatures of blends increased as the amount of PC increased. Each blend showed a single peak of tan δ in the glass transition region, suggesting that PTT and PC might be compatible.