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삼차원 Nav i e r- St oke s 해석을 이용한 원심다 익송풍기의 최적설계
서성진(Seoung-Jin Seo),김광용(Kwang-Yong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this paper, the response surface method using three-dimensional Navier-Stokes analysis to optimize<br/> the shape of a forward-curved blades centrifugal fan, is described. For numerical analysis,<br/> Reynolds-averaged Navier-Stokes equations with standard k-e turbulence model are transformed into<br/> non-orthogonal curvilinear coordinate system, and are discretized with finite volume approximations. Due<br/> to the large number of blades in forward-curved blades centrifugal fan, the flow inside of the fan is<br/> regarded as steady flow by introducing the impeller force models for economic calculations. Linear<br/> Upwind Differencing Scheme(LUDS) is used to approximate the convection terms in the governing<br/> equations. SIMPLEC algorithm is used as a velocity-pressure correction procedure. Design variables,<br/> location of cur off, radius of cut off, expansion angle of scroll and width of impeller were selected to<br/> optimize the shapes of scroll and blades. Data points for response evaluations were selected by<br/> D-optimal design, and linear programming method was used for the optimization on the response<br/> surface. As a main result of the optimization, the efficiency was successfully improved. It was found<br/> that the optimization process provides reliable design of this kind of fans with reasonable computing<br/> time
삼차원 Navier-Stokes 해석과 반응면기법을 이용한 원심다익송풍기의 최적설계
서성진,김광용,Seo, Seoung-Jin,Kim, Kwang-Yong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
In this paper, the response surface method using three-dimensional Navier-Stokes analysis to optimize the shape of a multi-blade centrifugal fan, is described. For numerical analysis, Reynolds-averaged Navier-Stokes equations with standard k - c turbulence model are transformed into non-orthogonal curvilinear coordinate system, and are discretized with finite volume approximations. Due to the large number of blades in this centrifugal fan, the flow inside of the fan is regarded as steady flow by introducing the impeller force models for economic calculations. Linear Upwind Differencing Scheme(LUDS) is used to approximate the convection terms in the governing equations. SIMPLEC algorithm is used as a velocity-pressure correction procedure. Design variables, location of cur off, radius of cut off, expansion angle of scroll and width of impeller were selected to optimize the shapes of scroll and blades. Data points for response evaluations were selected by D-optimal design, and linear programming method was used for the optimization on the response surface. As a main result of the optimization, the efficiency was successfully improved. It was found that the optimization process provides reliable design of this kind of fans with reasonable computing time.
서성진(Seoung-Jin Seo),최승만(Seung-Man Choi),김광용(Kwang-Yong Kim) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper presents the response surface optimization method using three-dimensional Navier-Stokes Analysis to optimize the shape of a axial flow fan. Reynolds-averaged Navier-Stokes equations with k-ε turbulence model are discretized with finite volume approximations. Regression analysis is used for generating response surface, and it is validated by ANOVA. Five geometric variables, i.e., distribution of sweep angle at mean and tip, lean angle at mean and tip, and spanwise location of mean were employed to optimize the efficiency. The computational results are compared with experiment data. As a main result of the optimization, the efficiency was successfully improved.
서성진(Seoung-Jin Seo),김광용(Kwang-Yong Kim) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Shape of a multi-blades centrifugal fan is optimized by response surface method based on three-dimensional Navier-Stokes analysis. For numerical analysis, Reynolds-averaged Navier-Stokes equations with standard k-ε turbulence model are transformed into non-orthogonal curvilinear coordinate system, and are discretized with finite volume approximations. Due to the large number of blades in this centrifugal fan, the flow inside of the fan is regarded as steady flow by introducing the impeller force models for economic calculations. Optimizations with and without constraints are carried out. Design variables, location of cur off, radius of cut off, expansion angle of scroll and width of impeller were selected to optimize the shapes of scroll and blades. Data points for response evaluations were selected by D-optimal design, and linear programming method was used for the optimization on the response surface. As a main result of the optimization, the efficiency was successfully improved. The correlation of efficiency with relative size of inactive zone at the exit of impeller is discussed as well as with average momentum fluxes in the scroll.
서성진(Seoung-Jin Seo),김광용(Kwang-Yong Kim),장동욱(Dong-Wook Chang) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, three-dimensional incompressible viscous flow analysis and optimization using response surface method are presented for the design of a jet fan. Steady, incompressible, three-dimensional Reynolds averaged Navier-Stokes equations are used as governing equations, and standard k-ε turbulence model is chosen as a turbulence model. Governing equations are discretized using finite volume method. Sweep angles and maximum thickness of blade are used as design variables for the shape optimization of the impeller in response surface method. The experimental points which are needed to construct response surface are obtained from the D-optimal design and Full Factorial design and relations between design variables and response surface are examined.
서성진,첸시,김광용,강신형,Seo, Seoung-Jin,Chen, Xi,Kim, Kwang-Yong,Kang, Shin-Hyoung 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.1
A numerical study is presented for analysis of three-dimensional incompressible turbulent flows in a multi-blade centrifugal fan. Reynolds-averaged Navier-Stokes equations with a standard $k-{\espilon}$ turbulence model are discretized with finite volume approximations. The computational area is divided into three blocks; inlet core, impeller and scroll parts, which are linked by a multi-block method. The flow inside of the fan is regarded as steady flow, and the mathematical models for the impeller forces were established from a cascade theory and measured data. Empirical coefficients are obtained comparing between computational and experimental results for the case without scroll, and are employed to simulate the flow through the impeller with scroll. In comparisons with experimental data, the validity of the mathematical models for the impeller forces was examined. The characteristics of the flow in the scroll were also discussed.
서성진(Seoung-Jin Seo),김광용(Kwang-Yong Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This paper presents the response surface optimization method using three-dimensional Navier-Stokes analysis to optimize the shape of a forward-curved blades centrifugal fan. For numerical analysis, Reynoldsaveraged Navier-Stokes equations with k-ε turbulence model are discretized with finite volume approximations. In order to reduce huge computing time due to a large number of blades in forward-curved blades centrifugal fan, the flow inside of the fan is regarded as steady flow by introducing the impeller force models. Three geometric variables, i.e., location of cut off, radius of cut off, and width of impeller, and one operating variable, i.e., flow rate, were selected as design variables. As a main result of the optimization, the efficiency was successfully improved. And, optimum design flow rate was found by using flow rate as one of design variables. It was found that the optimization process provides reliable design of this kind of fans with reasonable computing time.
서성진(Seoung-Jin Seo),최승만(Seung-Man Choi),김광용(Kwang-Yong Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper presents the response surface optimization method using three-dimensional Navier-Stokes analysis to optimize the blade shape of an axial flow fan. Reynolds-averaged Navier-Stokes equations with k-ε turbulence model are discretized with finite volume approximations using the unstructured grid. Regression analysis is used for generating response surface, and it is validated by ANOVA and t-statistics. Four geometric variables, i.e., distribution of sweep angle at mean and were tip respectively employed to improve the efficiency. The computational results are compared with experimental data and the comparisons show generally good agreements. As a main result of the optimization, the total efficiency was successfully improved. Also, detailed effects of sweep and lean on the axial flow fan are discussed.