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이중섭(Chung Seob Yi),이태의(Tae Eui Lee),이치우(Chi Woo Lee) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.3
From the flow analysis of the silencer for 8 kW diesel generators, the following results were obtained. For silencer-1, it was confirmed that the holes formed at the inlet-side portion connect into the exhaust pipe in the chamber. The exhaust pipe installed inside silencer-1 was integrally connected through the holes in the chamber. As a result, it was confirmed that the pressure inside the chamber was kept stable. It was confirmed that the pressure loss generated inside an absorptive type silencer such as silencer-2 was small. The differential pressure of the inlet-outlet of silencer-1 and silencer-2 was confirmed to be 494 Pa at 15 m/s, 859 Pa at 20 m/s, 1326 Pa at 25 m/s, and 1911 Pa at 30 m/s.
이중섭(Chung-Seob Yi),이치우(Chi-Woo Lee) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
This study is about comparison of tangental entry type cyclone dust collector with axial vane type cyclone dust collector. Cut diameter and dust collection efficiency of both collector was compared by theory and experiment. Cut diameter was calculated by an quasi-empirical formula by Lapple and Shepherd. Measurement of cut diameter was conducted by particle counter through dust generator. As the result, cut diameter obtained by experiment was a little larger than that by theory. But the error is within 0.5㎛ in both type of collector, so it could be confirmed that theoretical value and experimental value were almost identical. And, as flow rate increased, dust collection efficiency was increased. Also axial vane type showed higher dust collection efficiency than tangental entry type. Therefore, it can be said that axial vane type cyclone dust collector has higher performance than the other.
선박 유압공급 장치용 사판식 유압 피스톤 펌프 내부 유동해석에 관한 연구
이중섭(Chung-Seob Yi),이정실(Jeong-Sil Lee),임종학(Jong-hak Lim),곽범섭(Beom-Seop Gwak),이호성(Ho Seong Lee),송철기(Chul Ki Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.1
In this paper, a flow analysis of a swash-plate type hydraulic piston pump installed on a hydraulic flow supply system for marine vessels is presented. A model and governing equations for computational fluid dynamics (CFD) analyses of swash-plate type hydraulic piston pumps were built, and simulation results regarding the internal flow field of the pump were obtained. By analyzing the internal flow of the swash-plate type hydraulic piston pump, we can confirm the time-dependent stroke of each piston as the pump rotates. We also verified that by analyzing the pulsating flow against the slope of the swash plate, the simulation results match well with the experimental results. The natural frequency of the system was computed to be approximately 380 Hz by applying and analyzing the fast Fourier transform (FFT) of each swash plate slope evaluated.
Numerical Analysis on the Thermal and Fluid in Air Conditioning Duct for Marine Offshore
Chung-Seob Yi(이중섭),Byung-Ho Lee(이병호),Do-Hun Chin(진도훈) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.2
This study is about distributions of heat transfer in air conditioning duct used for marine and oil drilling ship. As the convective heat transfer coefficient increased, heat transfer was conducted dynamically to inside as it exited to the outlet of duct. So, it was checked that the amount of heat transfer generated at duct increased as the convective heat transfer coefficient increased. In case the convective heat transfer coefficient was low, the temperature of duct showed the relatively high temperature distribution due to the temperature influence of internal fluid as the heat transfer between the outside and inside of the duct. In case of temperature distribution generated the volume of the duct along the change of the convective heat transfer coefficient, it was found out that the temperature descended as heat transfer was promoted and the convective heat transfer coefficient increased.
A Study on the Flow Analysis of Ventilation Louver for Polar Ship
Chung-Seob Yi(이중섭),Do-Hun Chin(진도훈) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5
This study is about flow distribution in ventilation systems used in marine louvers. The flow analysis on a louver installed on the vent of a vessel results in the following conclusions: (a) as the velocity of the fluid entering the louver increases, the pressure drop increases; (b) as the pressure drop increases, it tends to increase following a quadratic function. The velocity was confirmed to decrease at the entrance of the louver. This indicates that as the pressure increases, the velocity decreases, and the velocity of the moving fluid is increasing as it passes through the louver vanes.
이중섭(Chung-Seob Yi),진도훈(Do-Hun Chin) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
This study is about the distributions of flow in an air conditioning duct used for marine and oil drilling ships. Three-dimensional steady state turbulence was assumed as a governing equation for describing the flow in the air conditioning duct in this study. We compared the flow field with the pressure distribution according to the inlet velocity for two types of air conditioning duct, and stress and safe factors were simulated using ANSYS W/B. The result of fluid analysis showed an increased pressure drop in the duct according to the inlet velocity. Furthermore, secondary flow and complicated flow characteristics occurred at the bellows zone.
이중섭(Chung-Seob Yi),진도훈(Do-Hun Chin) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.1
This study is about distributions of flow in a ventilation system used in a louver for marine. In this study, to describe the flow in the ventilation opening louver, 3-dimensional steady-state turbulence was assumed to govern the equation. The flow field with pressure distribution according to the inlet velocity at the louver types is also compared. Flow analysis was performed for the louver numerical analysis on two types. The numerical analysis results in the louver blade indicated increased flow resistance at type-1.