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H.S. Im(임홍식),Y.S. Kim(김영상),S.H. Cho(조상현),G.B. Kwon(권기범) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.11
An optimization procedure has been set up for a multistage axial flow turbine performance improvement by matching a standard streamline curvature throughflow code and efficient hybrid constrained optimization algorithms. An analysis of the loss correlations has been made to find parameters that have influence on the turbine performance. By automatically switching the design variables for each turbine stage, it is possible to find an optimal radial distribution of flow parameters at the inlet and outlet of each blade row. The whole optimization procedure has been demonstrated on a multistage LP steam turbine for fossil power plant. The comparison of computed performance of the original and the optimized configuration shows remarkable improvement in the turbine efficiency at design conditions.
임홍식(H. S. Im),정동관(D. G. Jeong),김윤호(Y.H. Kim),강주완(J. W. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.11
일반적으로 원자력 발전용 탱크(tank)는 물이나 기름으로 채워져 있다. 안정성이 강조되는 원자력 발전소애 있어 이러한 탱크에 대한 내진설계(earthquake-resistance design)는 필수 요소이다. 지진이 발생하면 탱크는 물론이고 탱크 내부에 저장되어 있는 유체도 동시에 움직이므로, 이 경우 유체의 자유표면(free surface)에는 유체 출렁임(sloshing)과 같은 복잡한 현상이 발생된다. 유체가 출렁거리게 되면 탱크 벽면의 압력분포가 달라져 탱크 벽면의 변형(deformation)을 유발시킬 뿐만 아니라 탱크 지지부(tank support)의 구조적 불안정성을 야기시킨다. 이에 본 연구에서는 가진 된 원자력 발전용 탱크 구조물의 내진설계를 위해, 유체의 출렁임과 구조물의 변형에 의한 상호작용을 해석할 수 있는 상용 유체-구조 상호작용(fluid-structure interaction) 해석 code 인 CFD-ACE를 이용하여 지진해석 (seismic analysis)을 수행하였다.
조상현(S.H. Cho),김영상(Y.S. Kim),권기범(G.B. Kwon),임홍식(H.S. Im) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.11
A rotating blade of intermediate pressure steam turbines for fossil power plant is designed using a blade design system. To minimize the design time, a quasi-three dimensional flow analysis code is adopted to calculate flow properties of the blade section. Each designed blade section is stacked-up and a whole three dimensional blade can be modified by correcting each blade section, repeatedly. The full 3D numerical analysis for the stage including designed rotating blade will be performed later.
조상현(S.H. Cho),김영상(Y.S. Kim),권기범(G.B. Kwon),임홍식(H.S. Im) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
A rotating blade of steam turbines is designed using blade design system. To minimize the design time, quasi three dimensional flow analysis code is adopted to calculate blade section. The blade section lies on a streamline determined by previous steam turbine design precedures. The blade design system makes a transform of streamline coordinates, (m, rθ), to (m’, θ) coordinates and all design precedure except 3 dimensional stack-up is performed in the coordinates. Each designed blade section is stacked-up and whole 3 dimensional blade can be modified by correcting 2D section, repeatly. The full 3D numerial analysis for the one stage including designed rotating blade will be performed later.
권기범(G.B. Kwon),김영상(Y.S. Kim),조상현(S.H. Cho),임홍식(H.S. Im),나운학(U.H. Nah),김현민(H.M. Kim) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
High efficient steam turbine stage has been developed with the help of the 3-dimensional design tool. In this stage design, the compound leaned stacking method has been adopted to reduce the secondary flow loss of a turbine passage and to increase the performance efficiency for the turbine nozzles. And the turbine buckets have been designed with the quasi-3-dimensional turbomachinery blade design method. To verify the stage design, therefore, the 3-dimensional numerical simulation of a steam turbine stage was conducted. In this design, CFX-TASCflow was employed to predict the turbulent flow of a steam turbine stage. The analysis was performed in parallel calculation using the HP N4000 8 CPUs machine. The result showed CFX-TASCflow could be used as the 3-dimensional flow analysis tool of steam turbine design.
권기범(G.B. Kwon),김영상(Y.S. Kim),조상현(S.H. Cho),임홍식(H.S. Im) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
The high efficient steam turbine stage has been analyzed with the help of the 3-dimensional analysis tool. To increase the efficiency of steam turbine stage, the nozzle has to be designed by using the 3-dimensional stacking method. And the bucket has to be designed to cope with the exit flow of nozzle. To verify the stage design, therefore, the numerical analysis of the steam turbine stage was conducted. In this design, CFX-TASCflow was employed to predict the steam flow of the steam turbine stage. The numerical analysis was performed in parallel calculation by using the HP N4000 8 CPUs machine. The result showed the numerical analysis could be used to help to design the steam turbine stage.