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회전익 채널내 후류장에 의한 비정상 유동특성에 관한 연구
김윤제,전용렬,Kim, Youn J.,Jeon, Y.-R 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.4
The characteristic of unsteady flowfields on gas turbine, particularly on a rotor blade surface has been numerically investigated. The unsteady flow in a rotor blade passage as a result of wake/blade interaction is modeled by the inviscid flow approach, and solved by Euler equations using a time accurate marching scheme. Unsteady flow in the blade passage is induced by periodically moving a wake model across the passage inlet. The wake model used in this study is the Gaussian wate model in which the wake flow is assumed to be parallel with uniform static pressure and uniform relative total enthalpy. Numerical results show that for the case of Ps/Pr=1.5, the velocity and pressure distribution on the blade surfaces have much more complex profiles than for the case of Ps/Pr=1.0.
김윤제,Kim, Yun-Che 한국기술사회 2012 技術士 Vol.45 No.1
It has been a common misconception that landscape architecture is a gardening, landscape gardening or planting. However, landscape architecture is entirely different from gardening, landscape gardening and planting when it comes to professional category. Landscape architecture is a interdisciplinary science to improve a quality of citizen's life through analysing social culture, psychological configuration, aesthetic characteristic and integrating them in human society. Today's landscape architecture is a interdisciplinary technology including ecological and artistic value to create most of outdoor space used by human through preserving nature and enhancing the environment. The field has been changed constantly in the flow of the period and social development as providing green network system, recreation area, ecological environment in the city.
FHD(Flame Hydrolysis Deposition)공정으로 제작된 SiO<sub>2</sub> 광도파막의 분광학적 분석
김윤제,신동욱,Kim, Yun-Je,Shin, Dong-Wook 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.9
FHD(Flame Hydrolysis Deposition)공정은 화염 형성에 관여하는 장비의 조건들과 그에 따른 다양한 공정인자에 의하여 박막의 조성이 결정되며, 증착된 막을 치밀화하는 첨가물의 증발로 인해 열처리공정에서 조성이 변화되므로 공정인자로부터 최종적인 광도파막의 조성을 예측하는 것은 매우 어렵다. 본 연구에서는 FHD 공정에서 첨가가스의 유량을 제어하여 박막의 조성 및 광학적 특성을 예측할 수 있는 공정 분석의 기초자료를 제공하기 위하여 FTIR(Fourier Transformation Infrared Spectroscopy)측정과 ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrometry)측정을 통해 실리카 막의 조성분석에 대한 연구를 수행하였다. FTIR 흡수 스펙트럼을 통해 실리카 막에 존재하는 Si-O, B-O band를 측정하고 정성적 농도변화를 관찰 하였고, ICP-AES를 통해 Boron의 농도를 정량적으로 측정하였다. 이 두 결과로부터 FTIR을 이용한 정량적 조성분석의 기초자료인 B-O band의 흡광계수를 구하였다. Since many process parameters of FHD(Flame Hydrolysis Deposition) are involved in forming multi-component amorphous silica film ($SiO_2-B_2O_3-P_2O_5-GeO_2$), it has not been easy to predict the optical, mechanical and thermal properties of deposited film from the simple process parameters, such as source flow rate. Furthermore, the prediction of final composition of film becomes even more difficult after sintering at high temperature due to the evaporation of volatile dopants. The motivation of the study was to clarify the quantitative relationship between simple process parameters such as the flow rate of source gases and resulting chemical composition of sintered film. Hence, the compositional analysis of silica soot by FTIR(Fourier Transformation Infrared Spectroscopy) and ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrometry) under the control of the amount of dopant was carried out to obtain the quantitative composition. By measuring spectrum of absorbance from FTIR, the compositional change of B-O, Si-O, OH($H_2O$) in silica film was measured. The concentrations of these dopants were also measured by ICP-AES, which were compared with the FTIR result. The final quantitative relationship between simple process parameters and composition was deduced from the comparison between two results.
상사해법을 이용한 쐐기형 물체 주위의 미세 극성유체 유동 특성에 관한 연구
김윤제,Kim, Youn J. 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
A similarity solution of a steady laminar flow of micropolar fluids past wedges has been studied. The similarity variables found by Falkner and Skan are employed to reduce the streamwise-dependence in the coupled nonlinear boundary layer equations. Numerical solutions of the equations are then obtained using the fourth-order Runge-Kutta method and the distribution of velocity, micro-rotation, shear and couple stress across the boundary layer are obtained. These results are compared with the corresponding flow problems for Newtonian fluid past wedges with various wedge angles. Numerical results show that, keeping ${\beta}$ constant, the skin friction coefficient is lower for a micropolar fluid, as compared to a Newtonian fluid. For the case of constant material parameter K, however, the velocity distribution for a micropolar fluid is higher than that of a Newtonian fluid.
1,200 mm 급 축류펌프 임펠러 형상변화가 성능에 미치는 영향
김상원(Sang-Won Kim),김영기(Young-Gee Kim),김태윤(Tae-Yoon Kim),김윤제(Youn-Jea Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Variable-pitch axial-flow pump has an advantage of preventing the breakdown by pitching impeller angle, leading to the performance improvement. In order to make an effective use of the axial-flow pump under its various operating conditions such as flow rate and rotating velocity, it is of significant importance to find the best performance point for different impeller angles in Q-H curve. In this study, the effect of impeller angles on the performance of 1,200 mm axial-flow pump under varied flow rates was numerically investigated using the commercial CFD code, ANSYS CFX ver. 17.1. The numerical results of the present study and existing experimental data for the efficiency and total head were compared to evaluate the reliability of the numerical method and they showed a good agreement.