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LNG 플랜트용 프로판 냉매 압축기 공력설계 및 수치해석
박주훈(J.H. Park),이원석(W.S Lee),강경준(K.J Kang),신유환(Y.H. Shin),이윤표(Y.P. Lee),김광호(K.H. Kim),정진택(J.T. Chung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this study, flow structure in a three-stage centrifugal compressor for LNG Plant with the refrigerant, Propane, was numerically investigated at the design point of the compressor using a commercial code. Flow characteristics in the passages of impeller and vaneless diffuser were analyzed in detail including velocity vector, Mach number and pressure contours in blade spanwise and meridional plane for each stage. The estimation on the one-dimensional output from the preliminary design and three-dimensional shape of the impeller blade was performed through the flow analysis. The verification for designed compressor was carried out from three-dimensional Navier-Stokes analysis. The results will be used as reference data for a new design of 3-D impeller shape to improve propane refrigerant compressor performance.
경계층내 장애물이 터빈 캐스케이드내 3차원 난류유동에 미치는 영향에 관한 전산해석
이상일(Sangil Lee),정진택(J. T. Chung) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
The objective of this study is to verify the secondary flow and the total pressure loss distribution in the boundary layer fence installed linear turbine cascade passage and to propose an appropriate height of the boundary layer fence which shows the best loss reduction among the simulated fences. In this study, three different boundary layer fence was installed which have different height. This study was performed by numerical method and the result showed the boundary layer fence which has the height of one third of the inlet boundary layer thickness showed the best loss reduction rate.
가스 조성이 천연 가스 엔진의 성능에 미치는 영향에 관한 연구
방기헌(K.H.Bang),정진택(J.T.Chung),박심수(S. Park),김호영(H.Y.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The composition of natural gas varies with the location and climate. However, the effects of differences in fuel composition has not been considered in the development of natural gas engine. The purpose of this study is to investigate the effect of composition of natural gas on engine performance and to provide basic data for the development of natural gas engine and the selection of gas imports. As a result, when the Air/Fuel ratio was controlled with fixed spark timing, the variation of maximum power for six different gas fuels was less than 3%, and when the spark timing was controlled with fixed fuel volume, that was less than 7%.<br/>
전산해석을 통한 원심압축기용 디퓨저의 폭변화에 따른 성능 연구
이상철(S.C. Lee),이원석(W.S. Lee),신유환(Y.H. Shin),정진택(J.T. Chung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
This study describes effects of width contraction in vaneless diffuser on the performance of centrifugal compressors using commercial CFD code. Numerical analysis for three different diffusers such as Parallel, half contraction, and full contraction was performed. The results show that the performance of the centrifugal compressor is improved through the use of the diffusers with width parallel in high flow rate. The width contraction of diffusers is influenced static pressure rises. Comparison with the experimental data shows agreement.