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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 32, Issue 8 - Nov 2008
Volume 32, Issue 7 - Nov 2008
Volume 32, Issue 6 - Sep 2008
Volume 32, Issue 5 - Jul 2008
Volume 32, Issue 4 - May 2008
Volume 32, Issue 3 - May 2008
Volume 32, Issue 2 - Mar 2008
Volume 32, Issue 1 - Jan 2008
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Space Fitting Design of LNG Fuel Tank for a Small Truck and BOG Analysis of LNG Tank
Minkasheva, Alena ; Kwon, O-Woon ; Kim, Sung-Joon ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 379~386
DOI : 10.5916/jkosme.2008.32.3.379
The 36 liter LNG tank is designed to fit in the limited installation space of a small truck. Two LNG tanks allow one ton truck to run about 432 km per fueling. which is about 1.8 times longer than CNG mileage for the same truck. The variation of BOG with car acceleration for the different fuel liquid/vapor ratios in a tank is analysed by the modified Fortran program "Pro-Heatleak". Computational analyses show that the relationship between the BOG and liquid/vapor ratio is linearly proportional at a given acceleration. Fuel consumption decreases the volume of liquid fuel in the tank but increases the specific BOG. BOG increases with increasing of car acceleration when fuel liquid/vapor ratio is greater than 0.5 and decreases with increasing of car acceleration when fuel liquid/vapor ratio is less than 0.5. The difference between maximum and minimum BOG for full tank is about 12 percents. For the fuel liquid/vapor ratio equal to 0.5 BOG does not depend on car acceleration.
Fundamental Study on the Probability of Oyster Shell Desiccant Cooling System Driven by Renewable Energy of Photo-Voltaic Effect
Kim, Myoung-Jun ; Yu, Jik-Su ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 387~393
DOI : 10.5916/jkosme.2008.32.3.387
This paper has dealt with the probability of oyster shell desiccant cooling system driven by renewable energy of photo-volatic effect with fundamental experiment. The test materials for desiccant are activated charcoal, silica-gel, hi-dry, and oyster shell. The experiments were mainly performed with focusing on the observation of surface features, adsorption amounts of the adsorbent species, and the effect of temperature. Oyster shell has sufficient probability for using as desiccant in a air-conditioning system. Moreover, the heat releasing device would be attached in the system, the system based with oyster shell can be operated with high efficiency.
Water Injection/Urea SCR System Experimental Results for NOx Reduction on a Light Duty Diesel Engine
Nam, Jeong-Gil ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 394~403
DOI : 10.5916/jkosme.2008.32.3.394
The effects of water injection (WI) and urea injection for NOx on a 4-cylinder Direct Injection (DI) diesel engine were investigated experimentally. For water injection, it was installed at the intake pipe and the water quantity was controlled at the intake manifold and Manifold Air Flow (MAF) temperatures while the urea injection was located at the exhaust pipe and the urea quantity was controlled by NOx quantity and MAF. The effects of WI system, urea-SCR system and the combined system were investigated with and without exhaust gas recirculation (EGR). Several experiments were performed to characterize the urea-SCR system, using engine operating points of varying raw NOx emissions. The results of the Stoichiometric Urea Flow (SUF) and NOx map were obtained. In addition, NOx results were illustrated according to the engine speed and load. It is concluded that the NOx reduction effects of the combined system without the EGR were better than those with the EGR-based engine.
Investigation on the Internal Flow Characteristics of the Low Specific Speed Centrifugal Pump with Circular Casing
Choi, Young-Do ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 404~412
DOI : 10.5916/jkosme.2008.32.3.404
As a suitable volute configuration in the range of low specific speed, circular casing is suggested in this study. The internal flows in a centrifugal pump with the circular and spiral casings are measured by PIV and analyzed by CFD. The results show that the head and efficiency of the pump by a circular casing of very small radius are almost same as those by the spiral casing. Even at the best efficiency point, the internal flow of the pump by circular casing is asymmetric, and vortex and strong secondary flow occurs in the impeller passage. The radial velocity becomes higher remarkably only near the region of the discharge throat. The flow in the impeller outlet is strongly controlled by the circular casing because the velocity distribution almost does not affected by the position of the impeller blades.
Effect of Blade Angle on the Performance of a Cross-Flow Hydro Turbine
Choi, Young-Do ; Lim, Jae-Ik ; Kim, You-Taek ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 413~420
DOI : 10.5916/jkosme.2008.32.3.413
In order to improve the performance of cross-flow hydro turbine, detailed examination of the effect of the turbine configuration on the performance is needed necessarily. Therefore, this study is aimed to investigate the effect of blade angle on the performance of the cross-flow hydro turbine. Analysis of the turbine performance with the variation of the blade angle has been made by using a commercial CFD code. The results show that inlet and outlet angles of runner blade give considerable effect on the performance of the turbine. Pressure on the surface of the runner blade changes remarkably by the blade angle both at the Stages 1 and 2. Moreover, relatively small blade inlet angle is effective to produce higher value of output power. Recirculating flow in the runner passage causes remarkable hydraulic loss.
A Study on the Correlation Analysis of the Present Status of Positive Displacement Pumps Installed in Ships
Lee, Sang-Il ; Kim, You-Taek ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 421~429
DOI : 10.5916/jkosme.2008.32.3.421
Various kinds of ship are operated to transport cargo or passengers at sea in the world. Most of the important auxiliary machineries installed in those ships are fluid machineries such as pumps, compressors, and fans. A large percentage of fluid machinery is pumps which are classified turbo and positive displacement pumps. This paper analyzes only positive displacement pumps. This thesis has two aims: (a) to analyze the present status of pumps installed in merchant and training ships and (b) to find the correlation among sea going pump kW, port pump kW, total pump kW, GE kW, ME MCR, number of pumps, ME kgf, pump kgf. Based on ship's type, this paper seeks to find special characteristics as a result of analyzing head, flow rate, and kW. Moreover this paper analyzes and compares number of pumps, pump kW/ME MCR, pump kW/GE kW under the conditions of seagoing and berthing according to ship's type.
Implementation of Power Line MODEM for TDC Pulse Detection of SEPA
Yang, Hyun-Suk ; Lee, Byung-Yong ; Kim, Yoon-Sik ; Seo, Dong-Hoan ; Kim, Sung-Hwan ; Kwon, Yeong-Gwal ; Lee, Sung-Geun ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 430~436
DOI : 10.5916/jkosme.2008.32.3.430
Recently, there are many cases to use a ship's engine performance analyzer(SEPA) to measure pressure in cylinder and top dead center(TDC) of piston of engine, and analyze its performance such as fuel injection time and horsepower as well as wear of piston ring. But, SEPA needs TDC pulses(
) generated when pistons of engine are located to the TDC position (
), these pulses are gathered from sensors connected to gear wheel of the propeller shaft in the remote distance from the measurement point. Therefore, operators need a long wire cable(WRC) to TDC detecting sensor to get these pulses, but this method is a very uncomfortable and expensive in case of installation, and it might decrease user's purchase desire. In this paper, we design and fabricate a small and inexpensive MODEM cable(M0C) so that it may be available to transmit TDC pulse generated from sensor in propeller shaft through existing power line. We also verify the facts that this MOC can be applied to SEPA and the effectiveness of the system through the experiments.
Hardware Implementation of High-Speed Active Vibration Control System Based on DSP320C6713 Processor
Kim, Dong-Chan ; Choi, Hyeung-Sik ; Her, Jae-Gwan ; You, Sam-Sang ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 437~445
DOI : 10.5916/jkosme.2008.32.3.437
This paper deals with the experimental assessment of the vibration suppression of the smart structures. First. we have presented a new high-speed active control system using the DSP320C6713 microprocessor. A peripheral system developed is composed of a data acquisition system, N/D and D/A converters, piezoelectric (PZT) actuator/sensors, and drivers for fast data processing. Next, we have tested the processing time of the peripheral devices, and provided the corresponding test results. Since fast data processing is very important in the active vibration control of the structures, we have focused on achieving the fast loop times of the control system. Finally, numerous experiments were carried out on the aluminum plate to validate the superior performance of the vibration control system at different control loop times.
A Study on the Safe Position from the Local Fire in the Ship's Engine Rooms
Kim, Mann-Eun ; Lee, Kyoung-Woo ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 446~454
DOI : 10.5916/jkosme.2008.32.3.446
Control devices for fire safety systems located in a engine room are to be arranged at a safe position which is easily accessible during a fire. To develop an interpretation for the safe position in engine rooms, calculation and experiments are carried out to determine a correlation between radiant heat and distance from fire in this paper. On the basis of results of this research, the control devices for a main engine are to be installed in the behind side of an obstruction to reduce radiant heat from the fire of the main engine. In case of other control devices, they are also to be provided in the same manner of control devices for the main engine or are to be placed with 5 meters far from fire hazards.
A Study on the Effectiveness of Flammable Gas Monitoring System in the Cargo Pump Room of Tanker
Kim, Mann-Eung ; Lee, Kyoung-Woo ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 455~460
DOI : 10.5916/jkosme.2008.32.3.455
The flammable gas monitoring system is to be provided in cargo pump rooms of tankers in accordance with the requirements of SOLAS regulations, and flammable gas detectors are to be arranged in a proper position. In this paper, simulation tests and CFD analysis are carried out under the actual ventilation conditions of pump rooms in the ship in service. Based on the results, a new guidelines for an arrangement of flammable gas detectors are suggested.
The Influence of AlN Buffer Layer Thickness on the Growth of GaN on a Si(111) Substrate with an Ultrathin Al Layer
Kwon, Hae-Yong ; Moon, Jin-Young ; Bae, Min-Kun ; Yi, Sam-Nyung ; Shin, Dae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 3, 2008, Pages 461~467
DOI : 10.5916/jkosme.2008.32.3.461
It was studied the effect of a pre-deposited ultrathin Al layer as part of a buffer layer for the growth of GaN. AlN buffer layers were deposited on a Si(111) substrate using an RF sputtering technique, followed by GaN using hydride vapor phase epitaxy (HVPE). Several atomic layers of Al were deposited prior to AlN sputtering and the samples were compared with the others grown without pre-deposition of Al. And it was also studied the influence of AlN buffer layer thickness on the growth of GaN. The peak wavelength of the photoluminescence (PL) was varied with increasing the thickness of the GaN and AlN layers. The optimum thickness of AlN on a Si(111) substrate with an ultrathin Al layer was about
. Scanning electron microscope (SEM) images showed coalescent surface morphology and X-ray diffraction (XRD) showed a strongly oriented GaN(0002) peak.