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최재호(J. H. Choi),이진수(J. S. Lee),조현준(H. J. Cho),이성준(S. J. Lee),전승배(S. B. Chen),차봉준(B. J. Cha) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
This paper presents an aerodynamic design, flow analysis and performance test of a transonic centrifugal compressor for APU applications. The compressor is made up of a centrifugal impeller, a wedge diffuser and a des wirier. The impeller and diffuser for this kind of application should be developed to meet air-bleeding requirement and shaft power extraction requirements, that is, very wide operational range. Aerodynamic design for this purpose is performed and three-dimensional numerical analysis with Reynolds-averaged Navier-Stokes solver is performed to analyze the flows in the impeller, diffuser and deswirler considering the impeller tip clearance. Test module and Jig facilities for the compressor stage performance test are developed. The overall compressor stage performances measured at the test Jig are compared with aerodynamic design results.
최재호(J.H.Choi),김광용(K.Y.Kim),지명석(M.S.Jie) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
A numerical optimization process using a three-dimensional Naveer-Stokes solver has been developed to design a low noise automotive cooling fan. The conjugate gradient method is used to look for the search direction and the golden section method is used for the one dimensional search. Three variables concerned to stagger angle and sweep angle are chosen as design variables. To satisfy the constraints. exterior penalty functions ars employed. The final shape has been obtained after fifth changes of shape function in the present optimization using the object function defined as a ratio of production rate of turbulent kinetic energy to pressure head.<br/>
정영석(Y.S. Jung),유권종(G.J. Yu),소정훈(J.H. So),최주엽(J.Y. Choi),최재호(J.H. Choi) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
As the maximum power operating point(MPOP) of photovoltaic(PV) power generation systems changes with changing atmospheric conditions such as solar radiation and temperature, an important consideration m the design of efficient PV system is to track the MPOP correctly. Many maximum power point tracking (MPPT) techniques have been considered in the past, however, techniques using microprocessors with appropriate MPPT algorithms are favored because of their flexibility and compatibility with different PV arrays Although the efficiency of these MPPT algorithms is usually high, it drops noticeably in case of rapidly changing atmospheric conditions. This paper proposed a new MPPT algorithm based on perturb & observe(P&O) algorithm with experiment. The results shows that the new P&O algorithm has successfully tracked the MPOP, even in case of rapidly changing atmospheric conditions, and has higher efficiency than ordinary algorithms.