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축류 압축기 날개의 제작 공차가 공력 특성에 미치는 영향- 1. 날개 형상 곡률 변형
손정락,강동진,전현주,강신형,Sohn, Jeong L.,Kang, Dong Jin,Jun, Hyun Joo,Kang, Shin-Hyung 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.3
Blade shape profile in the axial compressor is one of the most important factors governing its aerodynamic characteristics. Manufacturing tolerance, which is inevitable in the blade manufacturing processes, may change blade profile and as a consequence, it will affect the compressor performance. In this paper, influence of manufacturing tolerance on the aerodynamic characteristics of axial compressor blades with distortion of blade profile curvatures is investigated by using a flow simulation technique. It is found that manufacturing tolerance can be an important factor affecting the source of both profile and wake losses of the axial compressor blades.
Jeong L. Sohn(손정락) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In order to develop a new fuel cell and/or to enhance fuel cell performance, it is very important to understand clearly what the real performance of a fuel cell is. However, some important issues for the assessment of a fuel cell performance still require additional considerations. For example, the performance of a fuel cell is generally described based on an isothermal condition in spite of the non-uniform cell temperature distributions under real operating conditions. Also, it is necessary to reveal the real difference in the performance of a fuel cell and a heat engine. Understanding of the purpose of the hybridization of a fuel cell with a heat engine is another important issue. In the present study, issues related to the performance of a fuel cell are considered from a thermodynamic point of view.
유동 해석을 이용한 평판형 고체 산화물 연료전지의 성능 특성 분석 (I) - 등온 모델 -
현희철,손정락,이준식,노승탁,Hyun, Hee-Chul,Sohn, Jeong L.,Lee, Joon-Sik,Ro, Sung-Tack 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
Parametric study for the analysis of performance characteristics of a planar -type solid oxide fuel cell(SOFC) using computational flow analysis is conducted. A planar -type SOFC, which is composed by two gas channels (fuel and ai.) and one set of anode-electrolyte-cathode assembly, is modeled as a two -dimensional isothermal case. Results of computational analysis of flow field including distributions of mass fractions in gas channels are used to the performance analysis of the fuel cell. Flow analysis makes it possible to consider current density distributions along the length of the cell in the process of performance analysis of the SOFC. As results of parametric study, it is found that the mole fraction of fuel at the inlet of fuel channel, operating pressure and temperature are closely related to the performance characteristics of SOFC.
가스화 복합화력발전 플랜트에서 CO<sub>2</sub>제거가 성능에 미치는 영향 해석
차규상,김영식,이종준,김동섭,손정락,주용진,Cha, Kyu-Sang,Kim, Young-Sik,Lee, Jong-Jun,Kim, Tong-Seop,Sohn, Jeong-L.,Joo, Yong-Jin 한국유체기계학회 2010 한국유체기계학회 논문집 Vol.13 No.1
In the power generation industry, various efforts are needed to cope with tightening regulation on carbon dioxide emission. Integrated gasification combined cycle (IGCC) is a relatively environmentally friendly power generation method using coal. Moreover, pre-combustion $CO_2$ capture is possible in the IGCC system. Therefore, much effort is being made to develop advanced IGCC systems. However, removal of $CO_2$ prior to the gas turbine may affect the system performance and operation because the fuel flow, which is supplied to the gas turbine, is reduced in comparison with normal IGCC plants. This study predicts, through a parametric analysis, system performances of both an IGCC plant using normal syngas and a plant with $CO_2$ capture. Performance characteristics are compared and influence of $CO_2$ capture is discussed. By removing $CO_2$ from the syngas, the heating value of the fuel increases, and thus the required fuel flow to the gas turbine is reduced. The resulting reduction in turbine flow lowers the compressor pressure ratio, which alleviates the compressor surge problem. The performance of the bottoming cycle is not influenced much.
복합화력 발전소 열 모델링을 통한 가스터빈 압축비 최적화 및 효율인자 민감도 분석
이성대(Sung Dae Lee),손정락(Jeong L. Sohn),송성진(Seung Jin Song) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
The simple topping cycle's optimum pressure ratio and the combined cycle's optimum pressure ratio were different. The optimization of topping cycle pressure ratio for a single pressure combined cycle power plant was analyzed. The topping cycle was considered as air standard bryaton cycle with component efficiency. The bottoming cycle consisted with HRSG and steam turbine was considered as rankine cycle with various performance factors such as pinch point temperature, terminal temperature, steam turbine inlet / outlet conditions, stack temperature, HRSG effectiveness, water quality. The reasonable thermal combined cycle modeling was presented. The variations of combined cycle efficiency for various performance factors were presented.