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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
Journal Basic Information
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
Selecting the target year
Performance Analysis of Freezing Desalination System using Seawater Heat Pump
Lee, Ho-Saeng ; Lee, Seung-Won ; Yoon, Jung-In ; Kim, Hyeon-Ju ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 373~378
DOI : 10.5916/jkosme.2011.35.4.373
The freeze desalination cycle with seawater heat pump system is simulated and designed for the basic data for the design of freeze desalination system. The basic model of seawater heat pump system is refrigeration cycle and indirect freeze desalination method is used for seawater desalination. The cycle performance of seawater heat pump such as COP, compressor work, condensing capacity was analyzed and the desalination performance such as fresh water productivity and energy per unit fresh water productivity was compared with respect to the seawater temperature of condenser inlet and ice ratio in the evaporator. The compressor work and condensing capacity decreased with respect to the decrease of seawater inlet temperature. The energy per unit fresh water productivity in case of
seawater inlet temperature showed 28.9% lower than that of
A Study on the Engine Performance and Emission Characteristics in a LP EGR System with Electronic Throttle Control
Park, Jun-Heuk ; Lim, Jong-Han ; Yoon, Jun-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 379~387
DOI : 10.5916/jkosme.2011.35.4.379
Research and development of LP EGR system for the performance improvement and emission reduction on diesel engine is proceeding at a good pace. LP EGR system seems to be helpful method to further reduce
emissions while maintaining PM emissions at a low level because the boost pressure is unchanged while varying EGR rate. This study is experimentally conducted on a 2.0L common rail DI engine at the medium load condition (2000 rpm, BMEP 1.0 MPa, boost pressure 181.3 kPa) that difficult to use large amount of EGR gas because of deteriorations of performance and fuel consumption. And we investigated the characteristics of performance and fuel consumption while varying EGR systems. The overall results using LP EGR system equipped with ETC identified benefits on reduction of PM and improvement of fuel consumption and thermal efficiency while keep the
level compared to HP EGR and LP EGR with back pressure valve.
Thermodynamic Analysis on Steam Reforming of Hydrocarbons and Alcohols for Fuel Cell System
Oh, Jin-Suk ; Lee, Kyung-Jin ; 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 4, 2011, Pages 388~396
DOI : 10.5916/jkosme.2011.35.4.388
The strengthened regulations for atmospheric emissions from ships have caused a necessity of new, alternative power system in ships for the low pollutant emissions and the high energy efficiency. Recently, new kinds of propulsion power system such as fuel cell system, which use hydrogen as an energy source, have been sincerely considered. Fuel conversion system to hydrogen is an essential part for fuel cell ship. We have investigated thermodynamically the steam reforming characteristics of hydrocarbons and alcohols for the fuel conversion systems.
The Flow analysis and the Flame structure of Turbulent Premixed Flat Burner
Kim, Hun-Ju ; Yun, Bong-Seok ; Heo, Su-Bin ; Park, Jae-Min ; Lee, Do-Hyung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 397~405
DOI : 10.5916/jkosme.2011.35.4.397
Hydrogen energy, as part of eco-friendly alternative energy, is made mostly through reforming of fossil fuels. The turbulent premixed combustion type of metal-fiber flat burner which is recently used in industry was tested in this paper. We measured the mean temperature distributions, CO, HC,
concentrations to observe the flame structure and flame stability in some kind of experimental conditions. And also PIV and several flow analysis methods were compared to establish the numerical analysis model. The results of this paper will be the basis of the burner design of steam reformer.
A Study on Performance of Solid Oxide Fuel Cell Stack for Ship Applications
Park, Sang-Kyun ; Kim, Young-Jin ; Roh, Gill-Tae ; Kim, Mann-Eung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 406~413
DOI : 10.5916/jkosme.2011.35.4.406
Recently the fuel cell has been spotlighted as a technology to reduce greenhouse gases emission from a ship. In this research, internal reforming 500kW solid oxide fuel cell stacks fueled by methane for a ship were developed. Characteristics of power and efficiency depending on the number of cells in the stack, hydrogen conversion ratio, and active area of the cell are evaluated. Also the effects of air and methane supplying conditions on performance are analyzed. As a result, as the number of cells, hydrogen conversion ratio, active area of the cell, or supplied air flow rate increase, the stack power and efficiency increase. When the methane flow rate increases, the power increases. However the efficiency decreases. In addition, the case at the current of 976.4 A, voltage of 529.1 V, with corresponding power of 516.6 kW shows that the efficiency of fuel cell stack is 42.91%.
Investigation of a Thermal Stress for the Unit Cell of a Solid Oxide Fuel Cell
Kim, Young-Jin ; Park, Sang-Kyun ; Roh, Gill-Tae ; Kim, Mann-Eung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 414~420
DOI : 10.5916/jkosme.2011.35.4.414
Thermal stress analysis of a planar anode-supported SOFC considering electrochemical reactions has been performed under operating conditions where average current density varies from 0 to 2000
. For the case of the 2000
operating condition, Structural stress analysis based on the temperature distributions obtained from the CFD analysis of the unit cell has also been done. From this one way Fluid-Structure Interaction(FSI) analysis, Maximum Von-Mises stress under negligible temperature gradient fields occurs when cell components are perfectly bonded. The maximum stress of the electrolyte, cathode and anode in a unit cell SOFC is 262.58MPa, 28.55MPa and 15.1MPa respectively. The maximum thermal stress is critically dependent on static friction coefficient.
Flow Analysis and an Experimental Study on Formation of Slurry Ice in the Reversing Flow Layer
Oh, Cheol ; Choi, Young-Gyu ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 421~428
DOI : 10.5916/jkosme.2011.35.4.421
Thermal energy storage(TES) cooling system using cheaper electricity of off-peak time has been applied to relieve a significant portion of the peak demand of electricity during the daytime in summer. Slurry ice type thermal energy storage cooling system is one kind of more efficient ice-thermal energy storage cooling system than Ice-on-Coil type or Encapsulated type TES cooling system, even though, which are more popular TES system. This experimental study was carried out to observe flow pattern and formation of slurry ice in reversing flow layer to improve efficiency of heat transfer between fluid and freezing tube and to disturb ice adhesion on tube surface. The reversing flow layer was made by using reversing materials in heat exchanger section(test section) to disturb ice adhesion. At this experiment, styrofoam balls and poly propylene balls were used as reversing materials, and a 20wt% solution of ethylene glycol was used as reversing flow layer. The experimental apparatus was constructed of the test section for making/storing slurry ice, the brine tank, pumps for circulating of a 20wt% solution of ethylene glycol and brine, a flow-meter, a data logger for measuring the temperature. The experiments were carried out under various conditions, with volumetric flow rate, ball filling rate and air filling rate.
Characteristics of On-off Control and Hot-Gas Bypass Control in an Industrial Cooler
Baek, Seung-Moon ; Moon, Choon-Geun ; Kim, Eun-Pil ; Jeong, Seok-Kwon ; Yoon, Jung-In ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 429~435
DOI : 10.5916/jkosme.2011.35.4.429
In this study the operational characteristics of the temperature control system between an on-offemployed cooler and a bypass type cooler is analyzed. Currently an on-off controller employed coolerwhich is the industry's leading type on the market for industrial coolers is used. The new type cooler isused a bypass controller at discharge gas. The COP of the bypass controlled cooler with discharge gas is at least 8% higher than the on-off controlled cooler. The maximum COP difference is about 20%. Based on the results, the bypass control with discharge gas shows the possible temperature control with high precision.
Estimation of Engine Output for Marine Diesel Engines
Jung, Kyun-Sik ; Lee, Jin-Uk ; Jung, Jin-Ah ; Choi, Jae-Sung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 436~442
DOI : 10.5916/jkosme.2011.35.4.436
To obtain the engine output correctly is basically very important factor for estimating a engine performance. But, it has been reported that the IHP measured from electronic indicator such as MIPS(Mean Indication Pressure System) has a deviation compared to mechanical indicator. It was reported by authors that the uncertainty of crank angle for TDC position could be one of the reasons. In this paper, the uncertainty of crank angle for TDC position and its influence to engine output were investigated respectively about M/E and G/E for marine diesel engines. For the purpose, two sampling methods of pressure in cylinder were considered which were 'angle base sampling' and 'time base sampling'. Angle base sampling is real crank angle acquired from angle encoder which is attached to crank shaft and time base sampling is crank angle calculated by detected revolution with Z-pluse of encoder. Time base sampling is same method of MIPS. This paper concluded that time base sampling method is not suitable for obtaining the output of marine diesel engine on board because of instantaneous speed variation and load fluctuation. Also it is verified that the variation of engine speed by load fluctuation should be one of reasons additionally in case of M/E.
Design of Anti-Surge Valve for FPSO Fuel Gas Compressor System
Park, Hyung-Wook ; Cho, Jong-Rae ; Lee, Seung-Min ; Park, Jong-Jin ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 443~450
DOI : 10.5916/jkosme.2011.35.4.443
Fuel gas compressor system is applied to medium FPSO. In order to avoid surge, this system used the anti-surge valves. When surge occurs it may lead to system's fracture. So anti-surge valves are evaluated structural strength and structural safety. Especially, in emergency mode, valves are must be guaranteed structural safety. In this study, structural strength and structural safety of anti-surge valve was evaluated using the numerical simulation. Unigraphics NX 4.0 was used as Geometrical models, structural strength and structural safety calculation were carried out by ANSYS Workbench 12.1. The ASME Boiler & Pressure Vessel Code is refer to allowable strength and safety factor of the valves.
A Study of Mechanical Properties for Austenite Stainless Steel of Cryogenic Liquied Nitrogen Storage Tank
Choi, Dong-Jun ; Park, Hyung-Wook ; Cho, Jong-Rae ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 451~459
DOI : 10.5916/jkosme.2011.35.4.451
Austenitic stainless steels of 300 series are widely used as the structural material due to excellent their cryogenic mechanical properties at cryogenic temperature. There are 316 steel which molybdenum is added to improve the austenitic stability, 316L which carbon contents is reduced to decrease the grain boundary precipitation during welding process, and 316LN which nitrogen is added to improve the austenitic stability and the mechanical strength. But material researches for the welding conditions and mechanical properties at the cryogenic temperature were insufficient so far. In this paper, the characteristics of mechanical properties considering the effect of welding conditions and cryogenic temperature are studied.
Optical Observation of Cavitation Phenomena in Diesel Fuel Injection Pumps
Ryu, Seung-Hyup ; Kim, Dong-Hun ; Kim, Byung-Seok ; Park, Tae-Hyung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 460~467
DOI : 10.5916/jkosme.2011.35.4.460
Cavitation phenomena during the spill process of the Bosch type fuel injection pump for medium-speed diesel engine were investigated by optical observations. Typically, these phenomena can cause a surface damage with material removal or round-off at the plunger and barrel port etc., and may shorten their expected life time. The images, which were recorded with high speed CCD camera and borescope, show that the plunger damage is mainly affected by fountain-like cavitation generated before the end of delivery. And the damages of barrel port and deflector are caused by jet-type cavitation generated after end of delivery.
Characteristics of Flow Field around Baffle Located Sudden Expansion and Contraction Open Channel using PIV Measurements
Lee, Cheol-Jae ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 468~474
DOI : 10.5916/jkosme.2011.35.4.468
The flow field around baffle located sudden expansion and contraction channel was measured by PIV method and the effect according to height change of baffle built in the flow field was evaluated. The inlet flow velocity and the baffle height influence mutually to the size and flow pattern of the recycle flow of the back of the baffle and the size of the area of the water power jump passing the upper part of the baffle. In case of Reynolds number
, the critical value of baffle height is estimated around h/H=1.6 and there was a decreasing tendency as the inlet flow velocity was increased.
Numerical Analysis on Performance Improvement for Wind Blade by the Groove
Hong, Cheol-Hyun ; Seo, Seong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 475~482
DOI : 10.5916/jkosme.2011.35.4.475
This study, a basic study to improve aerodynamic characteristic of a wind blade, explored through CFD how much the lift to drag ratio improves according to the shape of groove formed on the surface of airfoil NACA0015. This study found out that the ratio improves by 8.7% when the ratio between boundary layer(
) and the depth of groove(h), the ratio between the depth of groove(h) and the width of groove(d) and the ratio between the length(p) from one groove to the other and the width of groove are 1.1, 0.1 and 1.2 respectively. The number of grooves is two. It was also confirmed that the improvement of the lift to drag ratio is maintained after certain angle of attack.
A Miniaturized Broadband Impedance Transformer Employing Periodic Ground Structure for Application to Silicon RFIC
Young, Yun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 483~490
DOI : 10.5916/jkosme.2011.35.4.483
Using a coplanar waveguide employing periodic ground structure (PGS) on silicon substrate, a highly miniaturized and broadband impedance transformer was developed for application to low impedance matching in broadband. Concretely, the multi-section transformer was designed using Chebyshev polynomials design technique for ultra broadband operation. Its size was 0.026
on silicon substrate, which was 8.7 % of the one fabricated by conventional coplanar waveguide on silicon substrate. The transformer showed a good RF performance over a ultra broadband from 8 - 49.5 GHz.
A Study on the DGPS Radiobeacon Propagation Measurement of Domestic Ferry Lines
Jeon, Joong-Sung ; Lee, Seo-Jeong ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 491~499
DOI : 10.5916/jkosme.2011.35.4.491
Starting with maritime DGPS base stations of Palmido, Ochongdo which have been operated since 1999, truly our nation has become the most powerful country possessed with total of 17 DGNSS base stations in the field of DGNSS operation infrastructure. This paper examines into the country's DGNSS services as measuring the service range of the maritime DGPS base stations in the domestic ferry lines which sections are from Jeju to Incheon, from Busan to Jeju, from Jeju to Nokdong, the propagation characteristics of the radio waves of 300 kHz bands on sea and land path. As a result of identifying the service range of the DGPS in the sea routes of the southern sea and the western sea, the measured results of the DGPS signals are confirmed more than 100 NM(recommended service range). It can be possible to practical use the position information, which is safe navigation and various marine traffic management systems. It will be useful an expansion of maritime DGPS reference station in the near future.
Micro-optic Submersion Detection Systems using In-line Fiber Collimator
Sohn, Kyung-Rak ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 500~505
DOI : 10.5916/jkosme.2011.35.4.500
In this paper, two types of micro-optic submersion detection systems are proposed and demonstrated. The structures are based on the transmission and reflection of incident light, respectively. Two collimators are separated by 10 mm and installed face to face in straight line. The incident light transmits from one side of collimator to the other through the air, but the optical loss is below 1 dB. On the other hand, when the sensors are submersed into water, most of optical power scattered into water. The systems monitor the dramatical power change to alarm the submersion. Reflection type of sensor system has a Bragg grating at the end of the sensor for back-reflection of sensing signal. This is for simple configuration of systems. The performance of two sensor systems are described in detail.
Low Power Rectenna for Wireless Power Transmission at 900MHz
Kim, Yea-Ji ; Park, Dong-Kook ; Sohn, Kyung-Rak ; Kang, In-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 506~511
DOI : 10.5916/jkosme.2011.35.4.506
In this paper, a rectenna for wireless power transmission at 900MHz is proposed. Rectenna is a device transforming RF power into DC power and it may consist of a antenna, rectifying and charging circuits. In this paper, we designed a slot antenna to receive 900MHz signal, a rectifying circuit of about 40% efficiency at 0dBm input, and a charging circuit to store a weak power signal and supply constant voltage to load. From the experiment using a RFID reader as a transmitter for 1W power, it was found that the proposed rectenna receiving about 0dBm power can supply 3.3V constant voltage to 50
load during 280sec.
Current Activities of Navigation & Communication Equipments Industry and R&D
Mun, Seong-Mi ; Son, Joo-Young ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 4, 2011, Pages 512~518
DOI : 10.5916/jkosme.2011.35.4.512
The marine equipment industry in Korea has been growing along with shipbuilding industry since early 1980s. Major shipbuilding might be predicted to shift to China in the near future. Moreover, new paradigm of e-navigation is about to get geared in the real world, which was specifically noted by IMO (International Maritime Organization). In order to catch up with rapid changes in the environments, the industry sector should move fast, the public sector should setup proper measures, and the academic sector should spur the research and development of new technologies. In this paper, international marin equipment markets and standardization trends are presented along with several representative R&D activities.