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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society For Power System Engineering
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Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
Development Study on Vertical Axis Helical Savonius Wind Turbine
Yun, Dae-Jhoong ; Lee, Young-Tae ; Yang, Hyun-Bong ; Lim, Hee-Chang ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 5~12
DOI : 10.9726/kspse.2013.17.2.005
An analysis of wake effect in a wind farm
Ko, Kyung-Nam ; Park, Mi-Ho ; Huh, Jong-Chul ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 13~20
DOI : 10.9726/kspse.2013.17.2.013
A Study of Numerical Analysis on Wall Impinging Spray
Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 21~28
DOI : 10.9726/kspse.2013.17.2.021
Phenomenon of droplet impingement with high temperature wall needs to be investigated because atomization process of droplet and cooling process of the wall by the impingement are very important in industry, thus studies concerned with temperature of piston wall have been conducted in spray characteristics analysis of diesel engine. Hence, in this study, we defined
superheat degree of the wall by difference between
considering surface temperature of piston in the actual engine and
saturation temperature of the fuel and then investigated spray behavior of wall impinging with variance of the boiling process. In this study, in order to analyze wall impingement of droplet in accordance with difference of boiling condition, calculational conditions were set as
(transition boiling), and
(film boiling). As a result, it can be found that fuel vapor increases and droplet mass decreases in the order of the nucleate boiling, transition boiling, and film boiling.
An Experimental Study on Application of Biofuel to Diesel Engine
Yeom, Jeong-Kuk ; Ha, Hyeong-Soo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 29~37
DOI : 10.9726/kspse.2013.17.2.029
Compared to gasoline engines, diesel engines with a relatively simple ignition system are more advantageous in the application of biodeisel fuel to engine. Then in this study the comparative analysis on the spray characteristics and combustion emissions characteristic between the biodiesel(soybean oil) and diesel, the fuel for commercial diesel engine, was performed with common rail injection system. Injection pressure and ratio of biodiesel blended fuel were selected as main experimental variables. Consequently, it can be found that there is no significant difference in the macro characteristics of the spray behavior(spray penetration and spray angle) in response to change in the blend ratio of soybean oil and diesel at a fixed injection pressure, in particular, soot creation in combustion emissions in the region of low pressure was greatly affected by the blend ratio of soybean oil, however, the creation in the region of high pressure was almost unaffected by the blend ratio because of promoted atomization.
The Fabrication and Trial Performance of Injector Driver for CRDI
Kim, Sang-Am ; Wang, Woo-Gyeong ; Kim, On ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 38~45
DOI : 10.9726/kspse.2013.17.2.038
In this study, for carrying out the spray and combustion experiment using a Common Rail Direct Injection(CRDI) system, the controller was fabricated to drive a high speed camera, a injector and a laser beam sequentially at a low cost. CB280 module of one-chip micro processer was used for the controller. In order to confirm responsibility and utility of the controller, the current drive performance, the spray behavior and the injection rate were tested and analyzed under various experimental conditions. As this research results, we found that the fabricated controller was able to control the devices for the spray experiment precisely with the input value in program and it had the dynamic load responsibility and repetition. Also, we found that the injection rates of our experimental results were higher than those of others at the same injection pressure and the controller connected with the laser system and the data acquisition system had validity for carrying out the spray visualization experiment.
Free Vibration Analysis of Axisymmetric Cylindrical Shell by Sylvester-Transfer Stiffness Coefficient Method
Choi, Myung-Soo ; Yeo, Dong-Jun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 46~55
DOI : 10.9726/kspse.2013.17.2.046
In this paper, the computational algorithm for free vibration analysis of an axisymmetric cylindrical shell is formulated by the Sylvester-transfer stiffness coefficient method (S-TSCM) which combines the Sylvester's inertia theorem and the transfer stiffness coefficient method. After the computational programs for obtaining the natural frequencies and natural modes of the axisymmetric cylindrical shell are made by the S-TSCM and the finite element method (FEM), the computational results which are natural frequencies, natural modes, and computational times by both methods are compared. From the computational results, we can confirm that S-TSCM has the reliability in the free vibration analysis of the axisymmetric cylindrical shell and is superior to FEM in the viewpoint of computational times.
Identification of the Properties of Soils and Defect Detection of Buried Pipes Using Torsional Guided Waves
Park, Kyung-Jo ; Kim, Chung-Yup ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 56~62
DOI : 10.9726/kspse.2013.17.2.056
A technique is presented that uses a circular waveguide for the measurement of the bulk shear (S-wave) velocities of unconsolidated, saturated media, with particular application to near surface soils. The technique requires the measurement of the attenuation characteristics of the fundamental torsional mode that propagate along an embedded pipe, from which the acoustic properties of the surrounding medium are inferred. From the dispersion curve analysis, the feasibility of using fundamental torsional mode which is non-dispersive and have constant attenuation over all frequency range is discussed. The principles behind the technique are discussed and the results of an experimental laboratory validation are presented. The experimental data are best fitted for the different depths of wetted sand and the shear velocities are evaluated as a function of depths. Also the characteristics of the reflected signal from the defects are examined and the reflection coefficients are calculated for identifying the relation between defect sizes and the magnitude of the reflected signal.
Vibration Attenuation of a Drum-Typed Washing Machine Using Magneto-Rheological Dampers
Cha, Sang-Tae ; Baek, Woon-Kyung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 63~69
DOI : 10.9726/kspse.2013.17.2.063
Most washing machines are now produced as a drum-type, where a washing drum mounted on a suspension system with springs and dampers, to minimize the transmittance of the vibration from the drum to the frame. A low-cost MR damper, using magneto-rheological fluids, can produce variable damping forces by changing the current values in the magnetic coil. Experimental results show the comparison of the vibration attenuation performances between two different dampers. One test set-up uses a passive damper and another one uses a MR fluid damper. The test results showed that the vibration amplitude of the washing machine with the MR damper is much smaller than the case with the passive damper.
A Study on the Heat Transfer Enhancement of Miniature loop Heat Pipes by Using the Cu Nanofluids
Kim, Young-Sik ; Jeong, Hyo-Min ; Chung, Han-Shik ; Tanshen, Md.Riyad ; Lee, Dae-Chul ; Ji, Myoung-Kuk ; Bae, Kang-Youl ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 70~77
DOI : 10.9726/kspse.2013.17.2.070
An experimental study was carried out to understand the heat transfer performance of a miniature loop heat pipes using water-based copper nanoparticles suspensions as the working fluid. The suspensions consisted of deionized water and copper nanoparticles with an average diameter of 80 nm. Effects of the cupper mass concentration and the operation pressure on the average evaporation and condensation heat transfer coefficients, the critical heat flux and the total heat resistance of the mLHPs were investigated and discussed. The pressure frequency also depends upon the evaporator temperature which has been maintained from
. The Investigation shows 60% filling ratio gives the highest inside pressure magnitude of highest number pressure frequency at any of setting of evaporator temperature and 5wt% results the lowest heat flow resistance.
Investigation of Thermal Conductivity and Convective Heat Transfer of Alumina Nanofluids under Laminar Flow
Seung-Il, Choi ; Hafizur-Rehman, Hafizur-Rehman ; Eom, Yoon-Sub ; Ji, Myoung-Kuk ; Kim, Jun-Hyo ; Chung, Han-Shik ; Jeong, Hyo-Min ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 78~86
DOI : 10.9726/kspse.2013.17.2.078
In this research, dilute colloidal suspension alumina nanofluids were prepared by dispersing alumina nanoparticles in DI water and ethylene glycol as base fluids. Particle size analyzer and TEM test results revealed that the size of the alumina nanofluids(3wt% and 5wt%) with dispersion time 3hrs were 46nm and 60nm respectively. Thermal conductivity of these alumina nanofluids was measured by means of hot wire technique using a LAMBDA system. For water based alumina nanofluids, thermal conductivity enhancement was from 2.29% to 3.06% with 5wt% alumina at temperatures ranging from 15 to
. Whereas in case of ethylene glycol based alumina nanofluids under the same temperature range, thermal conductivity enhancement was from 9.6% to 10% with 5wt% alumina. An enhancement of 37% average convective heat transfer was achieved with 5wt% alumina nanofluids at Re of 1,100.
Performance analysis of an organic Rankine cycle for waste heat recovery of a passenger car
Kim, Hyun-Jin ; Moon, Je-Hyeon ; Yu, Je-Seung ; Lee, Young-Sung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 87~94
DOI : 10.9726/kspse.2013.17.2.087
Applicability of organic Rankine cycle for a passenger car with 3.5 L gasoline engine to convert low grade waste heat to useful shaft power has been numerically studied. Working fluid is R134a, and the Rankine cycle is composed of boiler for recovering engine cooling water heat, super heater for recovering exhaust gas heat, scroll expander for converting waste heat to shaft power, condenser for heat emission, internal heat exchanger, and feed pump. Assuming efficiencies of 90% for the heat exchangers, 75% for the scroll expander, and 80% for the feed pump, the Rankine cycle efficiency of 5.53% was calculated at the vehicle speed of 120 km/hr. Net expander shaft output after subtracting the power required to run the pump was 3.22 kW, which was equivalent to 12.1% improvement in fuel consumption. About the same level of improvement in the fuel consumption was obtained over the vehicle speed range of 60 km/hr~120 km/hr.
Numerical Investigation on Freezing in Ballast Tank of Ship Navigating in Ice-bound Sea
Kang, Ho-Keun ; Kim, Ki-Pyoung ; Ahn, Soo-Whan ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 95~102
DOI : 10.9726/kspse.2013.17.2.095
For vessels operating in the cold climate regions, the ballast water inside or hopper tanks above the waterline may be frozen, starting at the top of the tank and at the side walls. Therefore, countermeasures against freeze-up of the ballast tank such as air-bubbling system, hot steam injecting system, heating coil system and water circulating system are taken to prevent freeze-up phenomenon; however, there are no rigorous investigations of anti-freezing to examine the effectiveness and validity of systems against freeze-up of the ballast tank, in which the temperatures are about
(ambient air temperature) and
(sea water), respectively. In this paper, to ensure reasonable specifications for cold regions if the measures from the above-mentioned systems against freeze-up are effective, the phenomenon of ballast tank freeze-up is simulated and discussed in low temperature conditions. With the results using the commercial CFD code, CFX 14, the most cost-effective solution is conducted to prevent being frozen along the outer surface.
An experimental study on motions of a VLCO for wave power generation(1. Simple floating body)
Lee, Seung-Chul ; Goo, Ja-Sam ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 103~107
DOI : 10.9726/kspse.2013.17.2.103
The structure of a variable liquid column oscillator(a VLCO) is analogous to that of the tuned liquid column damper used to suppress oscillatory motion in large structures like tall buildings and cargo ships. The VLCO is a system absorbing high kinetic energy of accelerated motions of multiple floating bodies in the effect of air springs occurred by installation of inner air chambers. Thus, VLCO can improve the efficiency of energy than wave energy converters of the activating object type made in Pelamis Company. In this research, the experiment was performed that a simple floating body was filled with internal fluid of same draft. The characteristics of motions were evaluated in each case of the opening or closing of the upper valves.
A Study on Bloating of Porous Ceramic
Kim, Gui-Shik ; Kim, Hyeon-Gwan ; Jeong, Ji-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 108~113
DOI : 10.9726/kspse.2013.17.2.108
In this study, lightweight aggregate was made from basalt stone powder sludge. Clay and glass powder were respectively added from 0 to 20 wt% and from 0 to 100 wt%. The glass powder helped to form glassy phase which trapped generating gas in the materials.
helping bloating process was added from 0 to 10 wt%. It was possible to produce lightweight aggregate at range from
. The specimen was heated in furnace at 1100, 1150 and
for 15 min, respectively, to sinter aggregates. Chemical composition of materials were determined, and characteristics were analyzed, including specific gravity, water absorption. Lightweight aggregate which was heated at
had specific gravity of
, water absorption of 3.08%, and this value satisfied KS L 8551 standard.
Relationship Between Mechanical Properties and Damping Capacity in Stainless Steel with Two Phases of Reversed Austenite and Deformation Induced Martensite
Namgung, Won ; Jung, Mok-Hwan ; Lee, Hyang-Beak ; Kim, Jae-Nam ; Kang, Chang-Young ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 114~120
DOI : 10.9726/kspse.2013.17.2.114
This study was carried out to investigate the relationship between mechanical properties and damping capacity in high manganese austenitic stainless steel with two phase mixed structure of reversed austenite and deformation induced martensite. Reversed austenite of ultra-fine grain size less than
was obtained by reversion treatment. Two phase structure of deformation induced martensite and reversed austenite was obtained by annealing treatment at range of
for various time in cold rolled high manganese austenite stainless steel. In stainless steel with two phase mixed structure of martensite and austenite, damping capacity decreased rapidly with the increasing hardness and strength. With the increasing elongation, damping capacity was increased rapidly and then, slowly increased.
Effectiveness of a Heat Transfer Characteristics of an Auxiliary Chamber for Performance of an Air Spring
Jang, Ji-Seong ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 2, 2013, Pages 121~127
DOI : 10.9726/kspse.2013.17.2.121
The air spring is used widely because of the easy change of spring constant, and, a superior vibration and shock insulation performance. Among the apparatus using the merits of that, the air spring connected an auxiliary chamber has been developed and used as a component of suspension system for an automobile and a railroad car. The purpose of this study is to suggest a design method reflecting heat transfer effect for an air spring system connected auxiliary chamber. In order to do so, this study investigates change of reaction force along with variations in heat transfer coefficient, and, analyzes an effectiveness of a heat transfer characteristics of an auxiliary chamber for external force attenuation characteristics and impedance characteristics of an air spring connected an auxiliary chamber.