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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
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Journal DOI :
Korean Society of Marine Engineers
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Volume & Issues
Volume 35, Issue 8 - Nov 2011
Volume 35, Issue 7 - Nov 2011
Volume 35, Issue 6 - Sep 2011
Volume 35, Issue 5 - Jul 2011
Volume 35, Issue 4 - May 2011
Volume 35, Issue 3 - May 2011
Volume 35, Issue 2 - Mar 2011
Volume 35, Issue 1 - Jan 2011
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Performance Characteristics with Various Fuel Composition and Temperature for an External Type Fuel Pump in LPLi System
Nam, Deok-Woo ; Yoon, Jun-Kyu ; Lim, Jong-Han ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 566~575
DOI : 10.5916/jkosme.2011.35.5.566
Since LPG (Liquefied petroleum gas) fuel supply system has an advantage of low emission characteristics, many studies have been conducted. In spite of the advantage of LPG supply system, a higher vapor pressure and lower viscosity than diesel or gasoline fuel may cause unstable running of fuel pump by the deterioration in lubrication performance and chemical reaction with rubber parts than that of diesel and gasoline fuel. Therefore its physical properties can cause the deterioration of durability. In this research, we developed an external type LPG pump which has the advantage of the price competitiveness and the convenient maintenance for LPLi system. The experiments were carried out in order to assess characteristics of the external type fuel pump at different fuel composition and temperature. As a result, there aren't any differences between internal and external type pump performance. It is observed that the same level of efficiency was maintained for both pumps as flow rate was increased with higher fuel temperature and more contents of propane in the fuel. And the pressure difference in LPLi system is maintained at constant with the various fuel compositions and temperatures due to their own characteristics of fuel supply system.
Prediction of Adiabatic Capillary Tube Length of Heat Pump Using Carbon Dioxide
Oh, Hoo-Kyu ; Choi, Kwang-Hwan ; Jeon, Min-Ju ; Son, Chang-Hyo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 576~581
DOI : 10.5916/jkosme.2011.35.5.576
In this paper, the prediction of adiabatic capillary tube of heat pump using carbon dioxide is investigated theoretically and experimentally to offer the basic design data for the operating parameters of this system. The operating parameters considered in this study include evaporation temperature, cooling pressure of gas cooler, mass flowrate, and the length and diameter of capillary tube. Based on study results of several researchers, the correlation predicting the length of capillary tube of
heat pump was proposed. And the experimental results of evaporation temperature, mass flowrate and cooling pressure in adiabatic capillary tube have an good agreement to those calculated from Eq. (3) within 0.63~10.9%. Therefore, the prediction calculating the length of adiabatic capillary tube of
heat pump was proposed at the given conditions such as cooling pressure, evaporation temperature and capillary tube diameter.
A Study on Performance of Solid Oxide Fuel Cell System for Ship Applications
Park, Sang-Kyun ; Roh, Gill-Tae ; Kim, Mann-Eung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 582~589
DOI : 10.5916/jkosme.2011.35.5.582
The fuel cell technology has been considered as a technology to reduce greenhouse gases emission from a ship. In this research, internal reforming 500kW solid oxide fuel cell system fueled by methane for a ship were developed. Characteristics of gas temperature, stack power and system efficiency depending on the air flow rate,
flow rate, and system operation pressure are evaluated. As a result, air and
flow rate directly affect the temperature of inlet and outlet gas in the fuel cell stack. When the air and
flow rate increase, the stack power and system efficiency increases. However, the case of
flow rate increase, the efficiency decreases.
Performance Analysis of Methane Fueled Marine Solid Oxide Fuel Cell and Steam Turbine Hybrid Power System
Lee, Kyung-Jin ; Oh, Jin-Suk ; Kim, Sun-Hee ; Oh, Sae-Gin ; Lim, Tae-Woo ; Kim, Jong-Su ; Park, Sang-Kyun ; Kim, Mann-Eung ; Kim, Myoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 590~599
DOI : 10.5916/jkosme.2011.35.5.590
The electrification of the waste heat of fuel cell is necessary to enhance the efficiency of fuel cell system. For this purpose, the SOFC/ST(Solid oxide fuel cell/Steam turbine) hybrid system is suitable. The purpose of this work is to predict the performance of methane fueled SOFC/ST hybrid power system and to analyze the influence of operating temperature of stack, current density of stack, combustor outlet gas temperature, and boiler outlet gas temperature. According to the analysis, it is proved that making the best use of the waste heat of stack and minimizing the fuel consumption of combustor are essential for the high-efficiency of SOFC/ST hybrid system.
A Study on Hardening Characteristics of High Carbon Steel by using High Power Diode Laser
Hwang, Hyun-Tae ; Kim, Jong-Do ; So, Sang-Woo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 600~607
DOI : 10.5916/jkosme.2011.35.5.600
Recently, high carbon steel has become essential not only for shipbuilding parts, but also mass production. Its surface has been treated by carburizing, nitriding and induction hardening, but these existing treatments cause considerable deformation and increase the expense of postprocessing after treatment; furthermore, these treatments cannot be easily applied to parts that requiring the hardening of only a certain section. This is because the treatment cannot heat the material homogeneously, nor can it heat all of it. Laser surface treatment was developed to overcome these disadvantages, and when the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source. To estimate, microstructural changes and hardness characteristics of two parts (the surface treatment part, and parental material) are observed with the change of laser beam speed and surface temperature.
Experimental and CFD Simulations of Polluted Air Behavior in Rectangular Tunnels
Lee, Yong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 608~615
DOI : 10.5916/jkosme.2011.35.5.608
The objective of this study is to investigate the flow characteristics of polluted air behavior in rectangular tunnels using a PIV system and a commercial CFD program. The PIV experiments are simulated by using the olive oil as the tracer particles in scaled rectangular tunnels. Each model has one of four different outlet vents, each dimensionless L/H ratio of which is 0, 0.375, 0.75 and 1.125, respectively as the locations of each outlet are away from the vertical centerline through the inlet. A commercial CFD program, ANSYS CFX, was used to examine the velocity fields and the pressure distributions in numerical simulations. The kinematic viscosity of the air flow of
and the flow velocity of 0.3 m/s at the inlet are given under the same conditions in order to analyze the polluted air flow characteristics experimentally and computationally. This study is considered to examine the effect of the outlet locations in the naturally ventilated tunnel models.
Numerical Analysis of Thermal and Flow affected by the variation of rib interval and Pressure drop Characteristics
Chung, Han-Shik ; Lee, Gyeong-Wan ; Shin, Yong-Han ; Choi, Soon-Ho ; Jeong, Hyo-Min ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 616~624
DOI : 10.5916/jkosme.2011.35.5.616
The flow characteristics and heat transfer augment on the periodically arranged semi-circular ribs in a rectangular channel for turbulent flow has been investigated numerically. The aspect ratio of the rectangular channel was AR=5, the rib height to hydraulic diameter ratio were 0.07 and rib height to channel height ratio was set as e/H=0.117 for various PR(rib pitch-to-rib height rate) between 8~14, respectively. The SST k-
turbulence model and v2-f turbulence model were used to find out the heat transfer and the flow characteristics of near the wall which are suited to obtain realistic phenomena. The numerical analysis results show turbulent flow characteristics, heat transfer enhancement and friction factor as observed experimentally. The results predict that turbulent kinetic energy(k) is closely relative to the diffusion of recirculation flow. and v2-f turbulence model simulation results have a good agreement with experimental values.
The Flow Control by a Horizontal Splitter Plate for a Square Prism near a Wall
Ro, Ki-Deok ; Lee, Sang-Jun ; Lee, Gyeong-Yun ; Jang, Jae-Dong ; Jung, Yong-Gil ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 625~631
DOI : 10.5916/jkosme.2011.35.5.625
The passive control of fluid force acting on a square prism near a plane wall was studied by attaching horizontal splitter plate on the corner of the prism. The width of the splitter plate was 10% of the square width. The experiments were performed by measuring of fluid force on the prism and by visualization of the flow field using PIV. The experimental parameters were the attaching position and the space ratios G/B between the prism and wall. The flow between the prism and wall was remarkable and Karman vortex in the wake of the prism was considerable in the space ratio over 0.4. The point of inflection of average lift coefficient and Strouhal number on the prism were represented at the space ratio G/B=0.4 for the prototype prism and G/B=0.6 for the prism having horizontal splitter plate. The drag of the prism was reduced average 4.5% with the space ratios by attaching the horizontal splitter plate at the rear and lower corner on the prism. In this case, the size of the separated region on the upside of the prism was smaller than that of prism without the splitter plate.
Study on the Motion of Floater Structure for Design of Wave Energy Generation in Ocean
Li, Kui Ming ; Parthasarathy, Nanjundan ; Park, Young-Kyu ; Jung, Ho-Yun ; Choi, Yoon-Hwan ; Lee, Yeon-Won ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 632~639
DOI : 10.5916/jkosme.2011.35.5.632
In order to design a wave energy generate system, a 6-Degree of freedom motion analysis technique was applied to the three-Dimensional CFD analysis on two floating body and the behavior was interpreted according to the nature of the incoming wave. The waves are generated by the same type of wave in the model of tank using the piston type, but due to the shallow water that is generated from the bottom of the wave energy is attenuated by Ekman boundary layer. According to the wavelength of waves generated by the result of evaluating the behavior of floating body, it is concluded that 0.3m is the maximum amplitude of wavelength of 5m, and 0.15m is the minimum amplitude of wavelength of 1m. 1.06m is the maximum distance between the two floaters of wavelength of 6m.
Effect of Salinity on Dissolved Oxygen Characteristics in an Ejector-Aerator
Yang, Hei-Cheon ; Park, Sang-Kyoo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 640~646
DOI : 10.5916/jkosme.2011.35.5.640
Dissolved oxygen (DO) refers to the volume of oxygen that is contained in water, and is a major indicator of water quality. The objective of this paper was to investigate the effect of salinity on the dissolved oxygen characteristics in an ejector-aerator. An experimental aeration system composed of a motor-pump, an ejector, a motor-blower, a set of aeration and recirculation tank and a control panel. The dissolved oxygen concentrations decreased with the water salinity. The volumetric mass transfer coefficient increased with increasing the water salinity.
Development of An Information Exchange Software Supporting Multiple Media Communications in Vessels
Mun, Seong-Mi ; Jang, Won-Seok ; Son, Joo-Young ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 647~653
DOI : 10.5916/jkosme.2011.35.5.647
In vessels, various communication systems are now working with different vendor-specific ways, which are apt to cause the inter-operability problems. That, of course, leads to needs of standardization of communication network systems for vessels. The e-navigation system introduced by IMO also takes the standardization process as expected. In this paper, a 4S multiple media communication switching server for seamless communications among existing media for vessels is introduced, and the development of a information exchange software for the sever and its functionality verification results are presented as well.
Design Guide of Surface and Watertight LED Luminaires for Naval Vessels
Kil, Gyung-Suk ; Kim, Il-Kwon ; Cho, Hyang-Eun ; Kwon, Hyuk-Sang ; Cho, Heung-Gi ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 654~660
DOI : 10.5916/jkosme.2011.35.5.654
This paper dealt with a design guide of LED luminaires to replace the surface and watertight fluorescent lamp (FL) fixtures for naval vessels. Several standards such as Korean Industrial Standard (KS), Korea Defence Standard (KDS) and US Military Standard (MIL) were compared in terms of safety and performance of lighting fixtures. The electrical and optical characteristics like power consumption, total luminous flux, and illumination distribution of the FL fixtures were experimentally analyzed to acquire design rules for LED luminaires. Based on the results, four types of LED luminaires were fabricated, and we proposed a design guide of LED luminaires for naval vessels which save power consumption of 44~51 [%] and increase total luminous flux of 8~13 [%].
Design of Multi-channel Anti-Fouling System for Marine Traffic Facilities
Oh, Jin-Seok ; Kuak, Jun-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 661~666
DOI : 10.5916/jkosme.2011.35.5.661
Recently, there are active research activities regarding to power systems of marine traffic facilities using a hybrid generation system which includes a photovoltaic generation system and a wave power generation system. However, when the marine traffic system is operated on a maritime environment for a substantial period of time, it was reported that the shellfish was adhered inside the water column. To tackle this problem, researches on the AFS (Anti-Fouling System) are on the progress. However, use of the single channel AFS resulted in frequent replacement of anode. Thus, the paper proposes a multi-channel method on AFS and experiments have been taken place correspondently. To improve the reliability of the experiment, the melting anode result was applied to our simulation program. The outcome of the simulation illustrates that the proposed multi-channel AFS's anode in the buoy have been ionized equally.
A Routing Protocol of Optimal Medium per Hop based on a Max-Win Method (OMH-MW) for Overlapped Maritime Data Networks with Multiple Media
Son, Joo-Young ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 667~674
DOI : 10.5916/jkosme.2011.35.5.667
Data networks at sea will be overlapped networks with not only traditional carriers such as RF, satellites but also BWA like wireless LAN, WiBro, and WCDMA in near future. In this paper, an overlapped MANET model for data networks at sea, and a routing protocol (OMH-MW) selecting optimal transmission medium for each hop in routes are proposed. OMH-MW measures the optimality of each medium regarding the transmission characteristics of each application and those of the medium in together. The most suitable medium to each link is selected as the link in routes. Performances are compared with those of the MWR (Max-Win based Routing protocol searching optimal routes with only one medium).
Development of an Ultra-Violet Lamp and a Ballast for Ship's Ballast Water Treatment
Cheon, Sang-Gyu ; Park, Dae-Won ; Kil, Gyung-Suk ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 675~681
DOI : 10.5916/jkosme.2011.35.5.675
In this paper, we dealt with the design and fabrication of a medium pressure ultra-violet (UV) lamp and a magnetic ballast which are main components for ballast water treatment systems (BWTS). To acquire an optimal discharge condition of UV lamp, electrical and optical characteristics depending on the argon gas volume and the amount of mercury were experimentally analyzed. Rated voltage, current and power consumption of a prototype lamp were 490 [V], 8.6 [A] and 4.0 [kW], respectively. UV intensity of the lamp was 15 [%] higher than that of an equivalent lamp which is used in a BWTS. The magnetic ballast was designed in a UI core type through theoretical analysis and simulation. The open voltage and the rated power consumption of the ballast were 920 [V] and 8.5 [kVA] respectively. The disinfection efficacy which is carried out in a BWTS equipped with the UV lamp and magnetic ballast was over 99.99 [%], and this satisfy the IMO regulations.
Development of Long Period Wave Observation System based on GPS
Kim, Tae-Hee ; Gang, Yong-Soo ; Lee, Won-Boo ; Kim, Dae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 682~689
DOI : 10.5916/jkosme.2011.35.5.682
Recently, there are frequent disasters by Swell-like Wave in the coastal area, Korea peninsula. This phenomenon (Swell-like Wave) has long period above 10 seconds compared with wind wave. To prevent these disasters by the long-period wave in advance, it's necessary to observe it in real time. But existing instruments for wave observation can not observe long-period wave because they mainly are aimed to measure the short-period wind wave. Therefore, in this research it is tried to develop the GPS based Long Period Wave Observation System which real time operation can be realzied in the sea.
Stability Analysis of Mooring Lines of a Submersible Fish Cage System Using Numerical Model
Kim, Tae-Ho ; Hwang, Kyu-Serk ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 5, 2011, Pages 690~699
DOI : 10.5916/jkosme.2011.35.5.690
A numerical model analysis was performed to analyze the stability of the mooring lines of an automatic submersible fish cage system in waves and currents. The fish cage system consisted of a 12-angled rigid frame, net cage, cover net, 12 upper floats, 12 tanks(for fixed and variable ballast), mooring lines, anchors, and a control station. Simulations were performed with the cage at the surface of the water and at a depth of 20 m. A Morison equation type model was used for simulations of the system in two configurations. The force parameters described both regular and random waves, with and without currents, and their values were input to the model. Mooring tension calculations were conducted on the mooring lines, grid lines and lower bridle lines of the cage. The stability of the mooring lines was checked under both static and dynamic conditions.