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김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),정소걸(S.K. Chung),박의섭(U.S. Park),배상은(S.E. Bae),박수한(S.H. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump(for seawater lifting) by inverse design and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 ㎥/h. Finite volume mehtod with structured mesh and Realizable κ-ε turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the reference data. Also, the periodic condition calculation method for the mixed flow pump was carried out in order to investigate the pump performance characteristics with the modification of impeller geometry.
LNG 연료공급장치 적용을 위한 이중배관 시스템의 다물리 CAE 기반 설계 검증에 관한 연구
오재원(J.W. Oh),성기영(K.Y. Sung),이정희(J.H. Lee),배상은(S.E. Bae),조수길(S.G. Cho),김형우(H.W. Kim) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.3
This study was carried out for design verification based on CAE of double piping system used in LNG fuel supply system. The double pipe is composed of an inner pipe through which LNG flows, an outer pipe through which air flows, and support for supporting between the inner pipe and the outer pipe. In order to apply the developed double piping system to the fuel supply system, it is necessary to secure air circulation characteristics, heat stability, structure stability, and vibration safety against gas leakage. Therefore, the verification of multiphysics research is required. The double piping used for LNG fuel supply system is an important equipment used in the engine room of LNG propulsion ships and safety design is very important because of the risk of secondary damage caused by LNG leakage. Therefore, in this study, multiphysics CAE technology is applied to review the safety while satisfying the design requirements of the developed double pipe. Considering the pressure loss of the fan, machine engine and pipeline, the predicted actual flow condition was predicted within the allowable flow range. In addition, the structural and dynamic stability analysis showed that the support operates in the safe area.
크랭크축 각속도의 변동을 이용한 실린더내 압력 변화 추정(2)
임병진(B.J.Lim),박종범(J.B.Park),임인건(I.K.Lim),배상수(S.S.Bae),김응서(E.S.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper propose a new method to investigate combustion phenomena using the variation of crankshaft speed. From the idea which the variation of crankshaft speed contains the information of combustion the energy method is applied as a single degree of freedom. Through the comparison of measured and calculated<br/> crankshaft speed the proposed energy model is proved to be moderate. When the crankshaft speed is used in the energy equation filtering of speed is required. The frequency components of cylinder pressure is analyzed and<br/> the coefficients of Fourier series above the twelfth frequency of engine speed is considered as a noise. As an example for application of this research some combustion analysis like as mean effective pressure and heat<br/> release rate, and misfire detection were carried out.<br/>