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오형우,정명균,김상철,양근영,하진수,Oh, Hyoung Woo,Chung, Myung Kyoon,Kim, Sang Chul,Yang, Keun Yung,Ha, Jin Soo 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
An optimal design code for centrifugal pumps has been developed to determine geometric and fluid dynamic variables under appropriate design constraints. The optimization problem has been formulated with a nonlinear objective function to minimize one, two or all of the fluid dynamic losses, the net positive suction head required and the product price of a pump stage depending on the weighting factors selected as the design compromise. The optimal solution Is obtained by means of the Hooke and Jeeves direct search method. The performance analysis Is based on the mean streamline analysis using the present state-of-the-art loss correlations. The optimized efficiency and design variables of centrifugal pumps are presented in this paper as a function of non-dimensional specific speed in the range, $0.5{\leq}N$, ${\leq}1.3$. The diagrams presented herein can be used efficiently in the preliminary design phase of centrifugal pumps.
오형우,정명균,김재원,Oh, Hyoung Woo,Chung, Myung Kyoon,Kim, Jae Won 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.9
This paper presents a systematic two-zone modeling for reliable performance prediction of centrifugal compressors. In order to improve the predictive capability, a modified jet slip factor is developed and new corrections for the wake flow deviation and mass fraction are suggested based on the comprehensive experimental data of the three Eckardt impellers. The proposed two-zone modeling is tested against nine sets of measured data of centrifugal compressors. The results are also compared with those obtained by the mean streamline analysis. It was found that the predictions by the present two-zone modeling agree fairly well with experimental data for a variety of centrifugal compressors over the wide operating conditions.
윤의수,유일수,황순찬,오형우,Yoon, Eui-Soo,Yoo, Il-Su,Hwang, Soon-Chan,Oh, Hyoung-Woo 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.20 No.1
A circulating pump with installation space constraints was developed satisfying performance requirements such as flowrate, head and NPSHAv. The development procedures are composed of conceptual design, configuration design, performance analysis by CFD and performance test which were established in KIMM. The developed pump is OH4 type centrifugal pump which has a mixed-flow type impeller, a double volute and a rigid coupling. As a result of tests, the pump proved to meet all the requirements including space constraints and performance.
오형우(Hyoung Woo Oh),김광용(Kwang-Yong Kim) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The mean streamline analysis using the empirical loss correlations has been developed for performance prediction of industrial mixed-flow fan impellers in the present study. New simple, but effective, models for the additional Euler input work characteristic and an internal recirculation loss due to internal flow reversal under the low flowrate conditions are proposed in this paper. Comparison of overall performance predictions with six sets of test data of mixed-flow fans is accomplished to demonstrate the accuracy of the proposed models. Predicted performance curves by the present set of loss models agree fairly well with experimental data for a variety of mixed-flow fan impellers over the entire operating conditions. The prediction method presented herein can be used efficiently in the conceptual design phase of mixed-flow fan impellers.
윤의수,오형우,안종우,Yoon, Eui-Soo,Oh, Hyoung-Woo,Ahn, Jong-Woo 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2
The hydraulic design optimization and performance analysis of mixed-flow pumps for waterjet marine vehicle propulsion has been carried out using mean streamline analysis and three-dimensional computational fluid dynamics (CFD) code. In the present study, the conceptual design optimization has been formulated with a non-linear objective function to minimize the fluid dynamic losses, and then the commercial CFD code was incorporated to allow for detailed flow dynamic phenomena in the pump system. Newly designed mixed-flow model pump has been tested in the laboratory. Predicted performance curves by the CFD code agree very well with experimental data for a newly designed mixed-flow pump over the normal operating conditions. The design and prediction method presented herein can be used efficiently as a unified hydraulic design process of mired-flow pumps for waterjet marine vehicle propulsion.
윤의수(Eui-Soo Yoon),오형우(Hyoung-Woo Oh),안종우(Jong-Woo Ahn),이교상(Kyo-Sang Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
워터제트에 의해 추진되는 해군 함정에 정착하기 위하여 고속 추진용 사류형 펌프를 독자적인 기술로서 수력설계 및 유동해석을 수행한 후, 축소모델을 제작하고 성능을 시험하였다. 축소모델 센터펌프의 성능을 시험한 결과, 개발된 펌프는 수력효율이 88.1%이고, 우수한 캐비테이션 성능과 선희유동 성분이 작은 고효율 출구유동을 갖는 것으로 나타났다.
윤의수(Eui Soo YOON),오형우(Hyoung Woo OH),박무룡(Moo Ryong PARK) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The hydraulic performances of a Francis turbine which had been designed and tested by IMHEF were calculated with a commercial code and compared with the IMHEF test results. The non-dimensional specific speed of the turbine is 0.5, the runner exit diameter 0.4m and maximum efficiency 93.1% respectively. To make the calculation of the turbine more exact, the stay vanes, the guide vane, the runner and the draft tube were calculated simultaneously. The calculation results gave a quite good agreement with the IMHEF test data, and therefore it is expected that the present calculation technique will be utilized for the hydraulic design of efficient Francis turbines.