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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
Editor in Chief :
Volume & Issues
Volume 37, Issue 8 - Nov 2013
Volume 37, Issue 7 - Nov 2013
Volume 37, Issue 6 - Sep 2013
Volume 37, Issue 5 - Jul 2013
Volume 37, Issue 4 - May 2013
Volume 37, Issue 3 - May 2013
Volume 37, Issue 2 - Mar 2013
Volume 37, Issue 1 - Jan 2013
Selecting the target year
Burner combustion characteristics of hybrid type water mixing emulsion fuel
Kim, Cheol-Jeong ; Kim, Dong-Kwon ; Park, Kweon-Ha ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 308~315
DOI : 10.5916/jkosme.2013.37.4.308
Water emulsion technology has the problem of unstable combustion due to the rapid separation of water. To solve the problem, a hybrid mixing device was developed. The device attached on the burner was tested. As a result, the fuel consumption reduced to 12% in the similar condition of exhaust emissions and flame temperature, and 45.5%, 98.5% and 97.2% of NOx, CO, and smoke were reduced at the same inlet air and fuel flow rate.
Numerical study on the pressure drop and heat transfer enhancement in a flat-plate solar collector
Heo, Joo-Nyoung ; Shin, Jee-Young ; Lee, Dooho ; Son, Young-Seok ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 316~323
DOI : 10.5916/jkosme.2013.37.4.316
The use of artificial roughness in various forms of shapes and sizes is the most common and effective way to improve the performance of a flat-plate solar collector. In the present study, numerical analysis on heat transfer and pressure drop was performed in a rectangular channel with various rib arrays. The uniform heat flux is applied to the channel from the upper side. The forms of ribs considered in this study were rib
. Air is the working fluid, and the Reynolds number ranges from 3200 to 17800. Nusselt number and friction factor were investigated to predict the performance of the system with various type of ribs. The average Nusselt number and pressure drop were increased with the increase of velocity in all types of ribs. The highest heat transfer and pressure drop occurred for the baffle
, but highest performance factor considering heat transfer and pressure drop together occurred for the groove
. Therefore, heat transfer and pressure drop should be considered together when a flat plate solar collector is designed.
A study on the thermal performance of all glass evacuated tube collector and refrigerator using solar energy
Yoon, Jun-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 324~331
DOI : 10.5916/jkosme.2013.37.4.324
All evacuated tube collector is being constantly studied since it can reduce the conductive heat loss in absorber by using vacuum technology and has advantage of heat transport capacity and quick thermal response in comparatively small temperature difference. This study investigated the dynamic thermal performance of the solar collector with the control condition of solar irradiance and fluid temperature by using performance experimental apparatus which is combined with solar collector and refrigerator, examined the thermal characteristics in definite temperature range of fluid in constant temperature tank by simultaneously measuring refrigerating performance. As a result of it, I deducted the related equation of collector efficiency and found that mean collector efficiency has increased through quick heat transfer characteristics according to increase of outdoor temperature and irradiance in case of outlet temperature of constant temperature tank
when set outlet temperature of solar collector
with outlet temperature of constant temperature tank
. Also COP of refrigerator was acquired value of 6.2~7.1 at outlet temperature of constant temperature tank
Emission factors based estimation of exhaust emissions with biodiesel blended fuel from naval vessel propulsive diesel engine
Lee, Hyungmin ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 332~337
DOI : 10.5916/jkosme.2013.37.4.332
National investment was performed in the research and development of renewable energy because of climate change by air pollution, exhaustion of energy sources, energy security, and so on. Biodiesel fuel of the renewable energy is highlighted as friendly environment energy, it is possible to operate in regular diesel engines when it is blended with invariable ratios without making any changes. Emission factors have been estimated for commercial ship from various research institutes; however, it is difficult to develop emission factors for military vessels. In this work, biodiesel blended fuel emission factors for sulfur dioxide and carbon dioxide were quantitatively estimated from propulsive diesel engine installed on naval vessel using fuel property analysis. In addition, exhaust emissions were quantitatively calculated on the basis of fuel consumption rate with biodiesel content by percentage.
Characteristic analysis of flowfield around a square prism having a detached splitter plate using the PIV
Ro, Ki-Deok ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 338~343
DOI : 10.5916/jkosme.2013.37.4.338
The Flowfield characteristics of a square prism having a detached splitter plate at the wake region were investigated by visualization of the flow field using PIV. The experimental parameters were the width ratios(H/B=0.5~1.5) of the splitter plate to the prism width and the gap ratios (G/B=0~2) between the prism and the splitter plate. As the results the Strouhal number measured at the wake region of the detached splitter plate was decreased with the width ratio and the gap ratio. The clockwise vortex at the upside of the splitter plate and counterclockwise vortex at the downside were represented, the size of these vortices were increased with the width of the splitter plate. The reverse flow was represented at the wake region of the square prism having a detached splitter plate, the size of this reverse flow was increased with the width of the splitter plate.
Fluid-structure interaction analysis on a low speed 200 W-class gyromill type vertical axis wind turbine rotor blade
Cho, Woo-Seok ; Choi, Young-Do ; Kim, Hyun-Su ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 344~350
DOI : 10.5916/jkosme.2013.37.4.344
The purpose of this study is to examine the structural stability of a low speed 200 W class gyromill type vertical axis wind turbine system. For the analysis, a commercial code is adopted. The pressure distribution on the rotor blade surface is examined in detail. In order to perform unidirectional FSI(Fluid-Structure Interaction) analysis, the pressure resulted from CFD analysis has been mapped on the surface of wind turbine as load condition. The rotational speed and gravitational force of wind turbine are also considered. The results of FSI analysis show that the wind turbine reveals an enough structural margin. The maximum structural displacement occurs at trailing edge of blade and the maximum stress occurs at the strut.
Visualization for racing effect and meniscus merging in underfill process
Kim, Young Bae ; Kim, Sungu ; Sung, Jaeyong ; Lee, MyeongHo ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 351~357
DOI : 10.5916/jkosme.2013.37.4.351
In flip chip packaging, underfill process is used to fill epoxy bonder into the gap between a chip and a substrate in order to improve the reliability of electronic devices. Underfill process by capillary motion can give rise to unwanted air void formations since the arrangement of solder bumps affects the interfacial dynamics of flow meniscus. In this paper, the unsteady flows in the capillary underfill process are visualized and then the racing effect and merging of the meniscus are investigated according to the arrangement of solder bumps. The result is shown that at higher bump density, the fluid flow perpendicular to the main direction of flow becomes stronger so that more air voids are formed. This phenomenon is more conspicuous at a staggered bump array than at a rectangular bump array.
Porous modeling for the prediction of pressure drop through a perforated strainer
Jung, Il-Sun ; Park, Jae-Hyun ; Bae, Jae-Hwan ; Kang, Sangmo ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 358~367
DOI : 10.5916/jkosme.2013.37.4.358
In the present paper, we apply a porous modelling technique to accurately predict the pressure drop through the strainer by replacing all or some of the filter composed of perforated plates with porous media and there imposing the streamwise and transverse loss coefficients required according to the Forchheimer law and then confirm its effectiveness. At first, the streamwise coefficient is obtained by performing a simple simulation on the pipe flow mimicking the hole flow. Subsequently, the transverse coefficient is obtained by setting a unit pattern to have common flow loss characteristics with the repeated shape patterns in the filter, then performing numerical simulations on the prototype and porous model of the unit shape pattern, and finally comparing their results of pressure drop. To validate the applied modeling technique, we perform the numerical simulation with the two specified loss coefficients on a whole shape of strainer and compare the modeling results with those of the corresponding prototype numerical simulation. Comparison indicates that the modeling technique can predict the pressure drop and flow characteristics comparatively accurately and save the number of nodes closely related to the computational cost (CPU and memory) by about 3~4 times compared with the prototype simulation.
Wall flow characteristics with static mixer position and housing geometry for preventing urea-salt deposition
Lee, Banguk ; Lee, Jeekeun ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 368~377
DOI : 10.5916/jkosme.2013.37.4.368
The Urea-SCR system commercialized shows a remarkable performance to reduce NOx emission in heavy duty diesel engines. However, Urea-water solution injected upstream a mixer, which is set up inside a exhaust pipe to promote exhaust gas-atomized droplet mixing, bumps up against the wall of a exhaust pipe as the droplets flow downstream through the exhaust gas. The urea deposited on the wall of the exhaust pipe is changed into the Urea-salt, resulting in the decreased life-time of the SCR catalysts. Therefore, the development of the urea deposition avoidance technologies is being treated as an important issue of the Urea-SCR systems. An experimental study was carried out to investigate the effects of the wall flow characteristics around the mixer-housing assembly with the variation of the mixer housing surrounding and supporting the mixer, which is designed to increase the wall flow and then to reduce droplet deposition. The flow characteristics was investigated by using a hot-wire anemometry for 2-D simplified duct model, and the housing tilt angles and the position of the mixer were changed : angle of
, and mixer positions of 0L, 0.5L, 1L. The results showed that the wall flow onto the exhaust pipe was improved with changing the tilt angle of the mixer housing, and the wall flow improved more when the position of the mixer was on 1L.
A numerical study on the aerodynamic characteristics of a variable geometry throttle valve(VGTV) system controlling air-flow rate
Cho, Hyun-Sung ; Kim, Chul-Ho ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 378~383
DOI : 10.5916/jkosme.2013.37.4.378
A butterfly throttle valve has been used to control the brake power of an SI engine by controlling the mass flow-rate of intake air in the induction system. However, the valve has a serious effect on the volumetric efficiency of the engine due to the pressure resistance in the induction system. In this study, a new intake air controlling valve named "Variable Geometry Throttle Valve(VGTV)" is proposed to minimize the pressure resistance in the intake system of an SI engine. The design concept of VGTV is on the application of a venturi nozzle in the air flow path. Instead of change of the butterfly valve angle in the airflow field, the throat width of the VGTV valve is varied with the operating condition of an SI engine. In this numerical study, CFD(computational fluid dynamics) simulation technique was incorporated to have an aerodynamics performance analysis of the two air flow controlling systems; butterfly valve and VGTV and compared the results to know which system has lower pressure resistance in the air intake system. From the result, it was found that VGTV has lower pressure resistance than the butterfly valve. Especially VGTV is effective on the low and medium load operating condition of an SI engine. The averaged pressure resistance of VGTV is about 49.0% lower than the value of the conventional butterfly throttle valve.
A study on designing a level gauge for cryogenic liquefied storage vessel by using a differential pressure sensor
Choi, Dong-Joon ; Lim, Hyung-Il ; Doh, Deog-Hee ; Cho, Jong-Rae ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 384~390
DOI : 10.5916/jkosme.2013.37.4.384
The sizes of cryogenic vessels and storage tanks are becoming bigger due to strong demands from semiconductor and LCD industry as well as high-tech electronic industry. Conventional level and pressure gauges used for cryogenic vessels were analog types which made exact measurement difficult for the remained quantity at lower levels due to their poor accuracy. In this study, a design for a digital type gas level gauge which can measure the pressure and level inside of the cryogenic liquefied gas storage tanks has been proposed by using a differential pressure sensor, in which the measured data are monitored by a host PC and are transferred to a mobile printer for data confirmation at local station.
Development of a drive control system of a hull cleaning robot reflecting operator's convenience
Kang, Hoon ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 391~398
DOI : 10.5916/jkosme.2013.37.4.391
Fuel consumption in a vessel can be reduced by a hull cleaning which has been performed by the industrial robot. It is most important to attach safely and travel on the hull surface for a hull cleaning robot. In this study, therefore, we have developed a drive control system of the hull cleaning robot that enables a stable drive. In addition, operator's conveniences were reflected on the drive control system for comfort robot operation. Through a drive control experiments conducted at a hull test-bed, we demonstrated the drive control performance and conveniences of the developed drive control system.
A study on the robot for mining of underground resources
Noh, Jong-Ho ; Shin, Suk-Shin ; Park, Jong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 399~403
DOI : 10.5916/jkosme.2013.37.4.399
Mining diggers have been substituted with the robots for the mining works in dangerous and narrow tunnel, and those demands are increased in nowadays. In this study, experimental research on the remote controlled robots to perform after the development of the robot. According to the test results, performances of the developed robot and its working devices have been modified several times. It has been considered that the robot keeps its optimum performance in states as follows; driving speed 1.0 km/h, crawl angle
, spiking cycle 500bpm and breaking power
. And also it has been found that sufficient cooling for the robot's working parts is essential to extend those working periods longer than 3 hours steadily under rating condition.
A study on the pressure controller design of multiple control valve structure
Shin, Suk-Shin ; Park, Jong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 404~408
DOI : 10.5916/jkosme.2013.37.4.404
In this Study, another way to accomplish the goal of meeting large steam-flow requirements is the use of multiple valves. Multiple valves can provide better control in meeting the precision pressure controller requirements. Simulation demonstrates the effectiveness of the pressure controller. The key point of this study is to precisely control the position of the control valve on the outside of the electro-hydraulic system using a special PID controller. Simulation and experiments verify the performance of the controller.
A study on the hybrid communication system to remove the communication shadow area for controller system of navigational aids
Jeon, Joong Sung ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 409~417
DOI : 10.5916/jkosme.2013.37.4.409
Mu-communication board supported by multi-communication is designed with Atxmega 128A1 which is a low power energy consuming of 8-bit microcontroller. ATxmega128A1 microcontroller consists of 8 UART(Universal asynchronous receiver/transmitter) ports which can be setting appropriate user interface having command line interpreter(CLI) program with each port, 2 kbytes EEPROM, 128 kbytes flash memory, 8 kbytes SRAM. 8 URAT ports are used for the multi communication modem, GPS module, etc. and EEPROM is used for saving a configuration for program running, and flash memory of 128 kbytes is used for storing a Firm Ware, and 8 kbytes SRAM is used for stack, storing memory of global variables while program running. If we uses the hybrid communication of path optimization of VHF, TRS and CDMA to remote control AtoN(aid to navigation), it is able to remove the communication shadow area. Even though there is a shadow area for individual communication method, we can select an optimum communication method. The compatibility of data has been enhanced as using of same data frame per communication devices. For the test, 8640 of data has been collected from the each buoy during 30 days in every 5 minutes and the receiving rate of the data has shown more than 99.4 %.
Simulation for sensor network packet routing protocols based on distributed-event
Chung, Kyung-Yul ; Lim, Byung-Ju ; Lee, Hoo-Rock ; Rhyu, Keel-Soo ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 418~424
DOI : 10.5916/jkosme.2013.37.4.418
Both simulation and physical implementation are valuable tasks in sensor network routing protocols. In this paper, we propose an efficient underground utilities monitoring method within several constraints using wireless sensor network. First, in order to physically implement protocol of network which is applied, the distributed event-based simulation, which applies an existing nesC codes of sensor network routing protocols, is implemented and analyzed. Also, we have performed the simulation and analyzed the execution results for application model of routing protocols for monitoring underground utilities in the VIPTOS(Visual Ptolemy and TinyOS) environments which combine TOSSIM and Ptolemy II based on distributed event.
A study on the short-range underwater communication using visible LEDs
Sohn, Kyung-Rak ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 425~430
DOI : 10.5916/jkosme.2013.37.4.425
Robust and high speed underwater communication is severely limited when compared to communications in terrestial. In free space, RF communication operates over long distances at high data rates. However, the obstacle in seawater is the severe attenuation due to the conducting nature. Acoustic modems are capable of long range communication up to several tens of kilometers, but it has low data-rate, high power consumption and low propagation speed. An alternative means of underwater communication is based on optics, wherein high data rates are possible. In this paper, the characteristics of underwater channel in the range of visible wavelength is investigated. And the possibility of optical wireless communication in underwater is also described. The LED-based transceiver and CMOS sensor module are integrated in the system, and the performance of image transmission was demonstrated.
An experimental study on the fireproof performance of fire damper in accordance with insulation conditions on the coaming and blade
Choi, Tai-Jin ; Kim, Joung-Sik ; Choi, Kyeong-Kwan ; Lim, Young-Soo ; Kim, You-Taek ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 4, 2013, Pages 431~437
DOI : 10.5916/jkosme.2013.37.4.431
In this paper, Fire resistance test was carried out to obtain class H-120 thermal insulation of fire dampers according to a hydrocarbon fire conditions. Specimens were fabricated three different types according to the change of the insulation system applied to damper blade and coaming which were measured surface temperature by performing the fire resistance test. As a test result, specimen-1, 2 of an uninsulated damper blade were exceeded thermal insulation acceptance criteria at 21 minutes, 46 minutes respectively, but specimen-3 of an insulated damper blade was satisfied thermal insulation acceptance criteria during 120 minutes. The test results showed that the insulation of the damper blade is an important factor in the fireproof performance of fire dampers concerning the coaming length minimum 500 mm on the unexposed side as specified test standard.