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이기수(Gee-Soo Lee),최창호(Chang-Ho Choi),김진한(Jin-Han Kim),양수석(Soo-Seok Yang) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
Any circumferential variations of the impeller exit flow conditions influences on the volute inlet flow conditions. All these interactions are strongly coupled and affect consequently the performance of centrifugal pumps. In this paper, a commercial CFD code, which solves three-dimensional quasi-steady Navier-Stokes equations with an impeller/volute interaction, is used for the prediction of a centrifugal pump performance. The simplified model of an impeller/volute interaction requires affordable computing time and provides relevant results. As a result, detailed flow structures such as pressure rise, recovery and loss mechanism on the centrifugal pumps are obtained. Especially, hydraulic performances are compared between the case of impeller only and the case of impeller with volute configuration. In addition, pump performance at off-design operation are observed and discussed.
미립화 특성 : 다중 물리 해석을 이용한 비례제어 솔레노이드 밸브 설계
이기수 ( Gee Soo Lee ),김현철 ( Hyun Chul Kim ),성형진 ( Hyung Jin Sung ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
A multi-physics analysis was performed to investigate the phenomena of a linear control solenoid valve and analyze its design parameters under various external conditions. Axially symmetrical simulations were carried out to investigate simultaneously the phenomena of the electromagnetic field and the flow field coupled with a spring-mass-damper system.. The Arbitrary Lagrangian-Eulerian (ALE) method was employed to describe the dynamic behavior of the system. The simulation results were compared with experimental data to ascertain their accuracy and reliability. In the multi-physics analysis, the controllable pressure range of the valve was found to be =i0.18~0.84 A owing to the hydraulic fore, which depended on the supplied pressure pushed the spool forward and enabled a wider controllable range. The redesign II model could precisely control the pressure during the external current =i0.18~1.0 A; it was 68.3% of the total control range.
자동차 프런트 엔드 쿨링 팩 시스템의 전열 특성에 관한 연구
이기수(Gee-soo Lee),원종필(Jong-phil Won),이홍렬(Hongyeol Lee),정성훈(Sung-hoon Jung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The front end modules are on the way to becoming an automotive market standard. They can be assembled in single step on the cars, and provide cost savings involved by this approaches are the reason of the success. In this paper, to sustain this world trends, the new FECPS(front end cooling pack system) was developed and the thermal performance was evaluated on the front end module cooling performance test rig. In comparison with the target front end module, the cooling performance of the radiator and T/M oil cooler for the newly developed FECPS was decreased by 4.4% and 3.8% respectively but the cooling capacity of A/C system capacity was increased by 18.9%. On the FECPS with the integrated cooling module, the increased compressor discharge pressure compensated for the diminished condenser capacity owing to heat transfer from radiator to the condenser in integrated louvered fin.
이기수(Gee-Soo Lee),최정열(Jeong-Yeol Choi),김귀순(Kui-Soon Kim) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
In this paper, preconditioning method is parallelized on fast-ethemet PC cluster. The algorithm is based on scaling the pressure terms in the momemtum equations and preconditioning the conservation equations to circumvent numerical difficulties at low Mach numbers. Parallelization is performed using a domain decomposition technique(DDT) and message passing between sub-domains are taken from the MPI library. The results are shown to have good convergence properties at all Mach number on the circular arc Bump and are capable of reasonable predicting two-dimensional turbulent flows on DCA compressor cascade.