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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 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 by CFD and Aerodynamic Design of 100kW Class Radial Turbine Using Waste Heat from Ship
Mo, Jang-Oh ; Kim, You-Taek ; Kim, Mann-Eung ; Oh, Cheol ; Kim, Jeong-Hwan ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 175~181
DOI : 10.5916/jkosme.2011.35.2.175
The purpose of this study is to secure the design data for the optimization of the radial turbine and heat cycle system, by using the CFD analysis technique and the design of 100kW class radial turbine applicable to waste heat recovery generation system for ship. Radial turbine was comprised of scroll casing, vane nozzle with 18 blades and rotor with 13 blades, and analysis grid was used to about 2.3 million. Mass flow rate and rotational speed was 0.5kg/s, 75,0000rpm, respectively. Eight kinds of inlet pressure was set between 195 and 620kPa. As the flow accelerated through the nozzle passage to the throat, the pressure level at the pressure and suction sides becomed similar to about Mach number of 0.35. When the inlet temperature and pressure was
, 352kPa respectively, the isentropic efficiency and mechanical power showed the analysis results of 74% and 108kW.
Development of Cascade Refrigeration System Using R744 and R404A - Analysis on Performance Characteristics -
Oh, Hoo-Kyu ; Son, Chang-Hyo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 182~188
DOI : 10.5916/jkosme.2011.35.2.182
In this paper, analysis on the performance characteristics of R744-R404A cascade refrigeration system is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooling and superheating degree, compressor efficiency, and condensing and evaporating temperature in R404A high- and R744 low-temperature cycle, respectively. The main results were summarized as follows : It was observed that the highest COP of the system is achieved by higher superheating degree in R744 cycle than that in R404A cycle. The COP of the system increased by giving the subcooling degree in both cycles. The COP of the cascade system is the highest value when the system is operated at an optimum evaporation temperature.
Development of cascade refrigeration system using R744 and R404A - Prediction and comparison on maximum COP(Coefficient of Performance) -
Oh, Hoo-Kyu ; Son, Chang-Hyo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 189~195
DOI : 10.5916/jkosme.2011.35.2.189
In this paper, prediction and comparison on COP(coefficient of performance) of R744-R404A cascade refrigeration system are presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooling and superheating degree, compressor efficiency, and condensing and evaporating temperature in the R404A high- and R744 low-temperature cycle, respectively. The main results were summarized as follows : The prediction for performance of R744-R404A cascade refrigeration system have been proposed through multiple regression analysis and compared with other researcher's correlations. As a result, prediction proposed in the study shows disagreement with existing equations. Therefore, it is necessary to propose the more accurate correlation predicting the COP of R744-R404A cascade refrigeration system through an addition experiments.
Effects of the Wire-screen Rib on Heat Transfer and Friction Factors
Oh, Se-Kyung ; Ahn, Soo-Whan ; Lee, Dae-Hee ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 196~203
DOI : 10.5916/jkosme.2011.35.2.196
Experiments to determine heat transfer coefficients and friction factors are conducted on a stationary transverse parallel wire-screen rib roughened rectangular channel. The test section consists of 198 mm (W) x 40 mm (H) x 712 mm (L). The channel has the aspect ratio of 4.95 and hydraulic diameter of
=6.66 cm. Four wire screen ribs and a solid rib are used. 0.1 mm-thick-stainless steel foil heaters and thermocouples (T type) are used to measure the heat transfer coefficients. Reynolds numbers studied range from 20,000 to 60,000. The wire-screen rib height (e) to hydraulic diameter (
) ratio (
) is 0.075; spacing (p) to height ratio (p/e) is 10. Results indicate that the solid rib produces the greatest Nusselt number and friction factor.
A Study on the Flame Configuration and Flame Stability Mechanism with a Nozzle Diameter of Laminar Lifted Jet Flame
Kim, Tae-Kwon ; Kim, Kyung-Ho ; Ha, Ji-Soo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 204~215
DOI : 10.5916/jkosme.2011.35.2.204
Flame stability is the one of the main mechanism of laminar lifted flame and flame propagation velocity becomes a yardstick to measure the flame stability. Bilge has presented the flame propagation velocity of the triple flame and the flame stability mechanism related the flame configuration and mixture fraction. However, there was not able to observe all process of flame ignition and extinction for small nozzle diameter. In this paper, we have subdivided the flame configuration and stability mechanism and classified the flame behavior with a nozzle diameter. Also we have subdivided the 'triple flame propagation opened' and the 'triple flame propagation closed' from the triple flame propagation of triple flame criterion.
Numerical Analysis for the Internal Flow of Thermal Vapor Compressor with real gas equation of state
Kang, Wee-Kwan ; Choi, Du-Yeol ; Shin, Jee-Young ; Kim, Moo-Geun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 216~223
DOI : 10.5916/jkosme.2011.35.2.216
TVC is a kind of ejector which entrains low pressure working fluid by using the high pressure working fluid. While most papers relating with ejectors treat the working fluid as an ideal gas for convenience, the fluid doesn't behave as the ideal gas when phase change occurs. In this study, numerical analysis is conducted by applying Redlich-Kwong equation of state instead of ideal gas equation of state. Two turbulent models are compared for the better prediction and SST k-
model is preferred rather than realizable k-
model by comparison. Energy loss at the diffuser inlet and throat using the real gas equation of state is relatively greater than that using ideal gas law. For the real gas case, pressure increase due to shock train at the diffuser outlet is relatively smaller than the ideal gas case, but both cases have the same pressure increase due to a pseudo shock.
Numerical Analysis on the Heat Transfer and Pressure Drop Characteristics of a Channel with Pin-fin Structure
Heo, Joo-Nyoung ; Kim, Ji-Hoon ; Son, Young-Seok ; Shin, Jee-Young ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 224~231
DOI : 10.5916/jkosme.2011.35.2.224
Heating and/or cooling of the channel with pin-fin structure is a promising choice for the efficient heat transfer. Complex pin-fin structure shows highly irregular behavior like porous media. This study shows the numerical analysis on the characteristic of heat transfer and pressure drop of a channel with pin-fin structure. It predicts the experimental data quite well at the high porosity region with large diameter. Low porosity activates the rigorous flow disturbance and, consequently, the enhanced heat transfer. However, the concept of optimum design should be carefully reviewed because the pressure drop is also increased with decreasing porosity at low porosity region.
A Study on the Heat Flow Change of Vacuum Jacket Valve According to Pressure Change and Jacket Thickness
Kim, Si-Pom ; Lee, Kwon-Hee ; Jeon, Rock-Won ; Do, Tae-Wan ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 232~237
DOI : 10.5916/jkosme.2011.35.2.232
Recently, continuous research on cryogenic valves is being carried out with the rapid development of the cryogenic valve-related industry, and especially, high performance of cryogenic valves is being promoted due to the breakthrough development and demand of users, etc., of the mechanical, shipbuilding, semiconductor and display industry and the aerospace industry field, but it is the reality that technical development and research on cryogenic application equipment on vacuum insulation are insufficient. The present research focused on interception of heat exchange with the outside by keeping low pressure after installing a jacket pipe outside a stem and also considered heat transfer properties on changes in pressure of a vacuum part and radius of a jacket which can reduce heat exchange for effective heat transmission control by studying it in a three-dimensional numerical analysis method.
The Characteristic Study of Capacity Control of an Industrial Cooler Using an Invertor Compressor with Varing the Ambient Temperatures
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 2, 2011, Pages 238~243
DOI : 10.5916/jkosme.2011.35.2.238
The ambient temperature of the experimental conditions changes by varying the speed of the compressor and the electronic expansion valve opening. The effects of changing valve opening to the entire system has been investigated. The results show that the ambient temperatures of
controlled at 30Hz must be avoided. The capacity control range of the control compressor with changing speed is about 43~100% at
, 43~100% at
and 48~100% at
, respectively. The results show the capacity control range decreases with decreasing ambient temperature.
FEA of Pipe Rolling Process Using Planetary Rolling Mill for Stainless Steel
Lee, Jung-Kil ; Kim, Kwan-Woo ; Cho, Hae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 244~251
DOI : 10.5916/jkosme.2011.35.2.244
Pipe rolling process using the planetary rolling mill for AISI 304 stainless steel has been studied by using finite element method. Mannesmann method using three-roll is applied to this rolling process. Commonly, rolling process has started from the cold working and finished to the hot working. This rolling process has more advantage that make reduction of process and cost than existing extrusion process. This process includes various and complex process parameters. Each of the process parameters affects forming result. Therefore, all of the process parameters should be considered in FEA. In this study, possibility and productivity of forming pipe for AISI 304 stainless steel had been investigated. Also, preheating process and variations of rotation velocity and product thickness were considered in FEA. Rolling process for AISI 304 stainless steel pipe was successfully simulated and it should be useful to determine optimal rolling condition.
A Study on the Surface Treatment of Magnesium for marine engine systems
Yun, Yong-Sup ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 252~257
DOI : 10.5916/jkosme.2011.35.2.252
Magnesium thin films for marine engine parts such as the engine block and the cylinder head cover etc. were prepared on the magnesium alloy(AZ91D) substrate by Thermo-electron activated Ion-plating method. The influence of gas pressure and substrate bias voltages on the crystal orientation and morphology of the films was investigated with X-ray diffraction and field emission scanning electron microscope(FE-SEM), respectively. Moreover, the effect of crystal orientation and morphology of the magnesium films on the its hardness property was investigated as well. From the results, the hardness of the films was increased in Ar gas pressure due to the grain boundary strengthening and occlusion effects.
A Study for Improving the Performance of Savonius Wind Turbine
Hong, Cheol-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 258~263
DOI : 10.5916/jkosme.2011.35.2.258
This study is aimed at obtaining basic design data for Savonius wind turbine, available in the domestic wind environments. To the end, the flow field characteristics around the wind turbine attached with 1/4 wind shield were monitored along with numerical analysis. On the top of this, numerical analysis and experiments on the rpm of the turbine rotor were conducted. As a result, this study found that the numerical analysis results squares with the experiment results and the rpm improves by over 70%.
The Visualization of the Flowfield around Three Circular Cylinders in the Tandem Arrangement by the PIV
Ro, Ki-Deok ; Jang, Dong-Hyu ; Bae, Hung-Sub ; Kim, Won-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 264~270
DOI : 10.5916/jkosme.2011.35.2.264
The Characteristics of the flowfield around three circular cylinders in tandem arrangement was investigated by PIV. Strouhal numbers, vorticity, velocity vectors and velocity profiles were observed at centre-to-centre space ratios of P/D=1.25~3.75, and Reynolds number of Re=
. As the results the Strouhal numbers measured in the rear region of 3rd the cylinder were distinguished three kind of regions with the space ratios and The flow pattern in the wake of each cylinder was different according to these regions. The time averaged flow at region of each cylinder was almost stagnated and the size of the stagnated region was small in order of 1st, 2nd and 3rd cylinder. The direction of vortex at the front and rear region of 2nd cylinder was opposed each other with the small difference(
) of the attack angle
Identification of Damping Matrix for a Steel Bar by the Genetic Algorithm
Park, Sok-Chu ; Park, Young-Bum ; Park, Kyoung-Il ; Je, Hye-Kwang ; Yi, Geum-Joo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 271~277
DOI : 10.5916/jkosme.2011.35.2.271
An identification method of the structural damping matrix for a steel bar by the genetic algorithm is proposed. Supposing the damping matrix were in proportion to the stiffness matrix, the proportional factors can be identified from the curve fitting of the experimental frequency response function(FRF) by the genetic algorithm. Applying the identified damping matrix to FEM of a beam model, the values of the objective function could be reduced to about 1/60 in comparison with conventional FEM model without damping. The damping matrices of some sub-structures which have large damping partly could be identified by the algorithm, and they could be used as some parts of the FEM model for a whole structure.
A Study on Implementation of NMEA 2000 based Integrated Gateway using FPGA
Park, Dong-Hyun ; Hong, Ji-Tae ; Kim, Kyung-Yup ; Kim, Jong-Hyu ; Yu, Yung-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 278~287
DOI : 10.5916/jkosme.2011.35.2.278
NMEA 2000 protocol known as IEC 61162-3 of Multi-talker, Multi-listener and Plug and Play network communication has been adopted as standard network for SOLAS(Safety of Life at Sea) ship by IMO. This paper focuses on the implementation of FPGA and MicroBlaze for NMEA 2000 based gateway, which is able to convert NMEA 2000 protocol into various types of network protocol such as Ethernet, UART and USB using Vertex4-based ML401 board. Each communication module and the stack of NMEA 2000 are mounted on FPGA. To be able to receive each communication data, ML401 board is configured to handle required communication speed. PC based NMEA 2000 monitoring program is developed to verify that data on different networks are correctly converted each other in real time.
A Study of NMEA 2000 Protocol Application for Ship Electrical Power Converter Monitoring System
Hong, Ji-Tae ; Park, Dong-Hyun ; Yu, Yung-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 2, 2011, Pages 288~294
DOI : 10.5916/jkosme.2011.35.2.288
In this paper, the FPGA-based SoC board (Xilinx Virtex-4 ML401 EVM) is adopted to control electrical power inverter system. For marine application, its performance is shown on PC-based system for monitoring electrical characteristics of a power inverter using by the NMEA 2000 protocol. This power inverter system is achieved in Real-Time monitoring and control by dual micro-processor operation on embedded FPGA-based SoC board. One micro processor is for control (Control processor) electrical power inverter using by PWM signal. And the other microprocessor (Communication processor) is for communication with PC-based monitoring system. The two-processor is communicating each other using by dual-port ram (DPRAM). PC-based system user can control and monitor information of the electrical power inverter via NMEA 2000 based communication processor. Control and monitoring information includes the inverter status and configuration. SoC board converts this information to Parameter Group Numbers (PGNs) in the NMEA 2000 protocol. This system can be applied to marine power electronics for distributed power generation, transmission or regulation systems on the ship.