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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
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
A Study on the Performance Characteristic of Common Rail High Pressure Pump
Lee, Choon-Tae ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 5~10
DOI : 10.9726/kspse.2013.17.6.005
Diesel engines have the advantages of good fuel efficiency and low emissions. Therefore, car makers have been developed various kinds of diesel engine management system to clean up emissions while improving fuel efficiency. One of them is the common rail system. In the common rail system, diesel fuel is injected into the combustion chamber at ultra high pressures up to 1,800 bar to ensure more complete combustion for cleaner exhaust gas, and highly precise multiple injection reduces NOx emission, combustion noise and vibration. Generally speaking, common rail system consists of booster pump, high pressure pump, common rail, injectors, control valves, and sensors. The high pressure pump receives low pressure fuel from the booster pump and supply high pressure fuel to injectors through the high pressure common injection rail. Therefore, high pressure pump has an important role in common rail system. In this paper, we have investigated the performance of high pressure pump of common rail system.
Combustion Characteristic of Non-esterified Bio-diesel Oil at Lower Common Rail Pressure
Lee, Sang-Deuk ; Koh, Dae-Kwon ; Jung, Suk-Ho ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 11~17
DOI : 10.9726/kspse.2013.17.6.011
Esterified bio-diesel oil is normally used as blend oil of 3% that and 97% diesel fuel in Korea. Since specifics of it is similar to that of diesel fuel, availability of non-esterified bio-diesel oil that has a lower expenses of manufacturing is worthy of attention. However, bio-diesel oil has a demerit which it emits typically more NOx emission than diesel fuel. In this study, characteristic tests using blending oil with 95% gas oil and 5% bio-diesel oil were achieved at lower common rail pressure in order to improve this demerit. It was noticed that non-esterified bio-diesel oil has more similar characteristics to diesel fuel than esterified bio-diesel oil and it emits more NO emission by fuel NO mechanism.
The Effects of Partially Premixed Pilot Injection Timing on the Combustion and Emission Characteristics in a Common Rail Diesel Engine
Yoon, Sam-Ki ; Choi, Nag-Jung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 18~24
DOI : 10.9726/kspse.2013.17.6.018
An experimental study was performed to investigate the characteristics of combustion pressure and exhaust emissions when the pilot injection timing and EGR rate were changed in a CRDI 4-cylinder diesel engine. The pilot injection timing and EGR rate have a significant impact on the combustion and emission characteristics of diesel engine. In this study, the pilot injection timing and EGR rate variation were conducted to 2000rpm of engine speed with torque 50Nm. Combustion pressure and heat release rate were decreased under high EGR rate conditions but increased under the pilot injection timing
(BTDC). IMEP and the maximum pressure in cylinder(Pmax) were decreased under the same injection timing with the increase of EGR rate. The NOx emission was decreased with increasing the EGR rate. On the other hand, in the same injection timing conditions, CO, HC,
emissions were increased with increasing the EGR rate.
The Characteristics on the Engine Performance for Variation of Fuel Injection Timing in DI Diesel Engine Using Biodiesel(II)
Jang, Se-Ho ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 25~32
DOI : 10.9726/kspse.2013.17.6.025
Biodiesel is technically competitive with it and offers technical advantages over conventional petroleum diesel fuel. Biodiesel is an environment friendly alternative liquid fuel that can be used in any diesel engine without modification. In this study, (dP/dCA)max and heat release, emission characteristics with different fuel injection timings are compared between diesel fuel and biodiesel in the D.I. diesel engine with T/C. The engine was operated at five different fuel injection timings from BTDC 6deg to 14deg at 2deg intervals and with four different loads at engine speed of 1800rpm. The experiments in a test engine showed that ranges between low and high of (dP/dCA)max got narrower, as the engine load increased, BD blend rate increased, and fuel injection timing was delayed. Cumulative heat release increased with the advanced fuel injection timing. NOX emissions decreased with the delays of fuel injection timing.
Dynamic Response Analysis of Cylindrical Shell with Axisymmetric Loading
Choi, Myung-Soo ; Yeo, Dong-Jun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 33~39
DOI : 10.9726/kspse.2013.17.6.033
It is very important to analyze the dynamic responses of the shell structures from the viewpoint of the design of shell structures with a variety of axisymmetric loadings. In this paper, the computational algorithm for the dynamic response analysis of an cylindrical shell with axisymmetric loading is formulated by the transfer mass coefficient method based on the transfer of mass coefficient. After the computational programs for obtaining the dynamic responses of cylindrical shells with axisymmetric loading are made by the transfer mass coefficient method and the finite element method, the computational results by both methods are compared. From the computational results, we can confirm that the transfer mass coefficient method has the effectiveness in the dynamic response analyses of cylindrical shells with a variety of axisymmetric loadings.
Vibration transfer characteristic of foaming sponge seat with the auxiliary member for movie theater chair
Kim, Sung-Hwan ; Kang, Hwa-Joong ; Moon, Deok-Hong ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 40~46
DOI : 10.9726/kspse.2013.17.6.040
This paper describes the suggestion of the special seat with the auxiliary plastic member for movie theater chair. In the previous paper, we have reported on the development of foaming sponge seat with the auxiliary spring member. And we have confirmed that it was more effective on vibration transfer than the chair seat of foaming sponge only. In this study, we have examined the major design parameters needed in the development of a foaming sponge seat in which the mesh type plastic member are inserted to improve the vibration transfer effect of a chair seat. By applying experimentation to the prototype as well as the experimental modal analysis method, we made sure that the effect of the vibration transfer could be improved through the use of a mesh type plastic member as similar as the auxiliary spring member.
Experimental Investigations on the Temperature Characteristics of Oscillating Heat Pipe with Various Filling Ratio
Jeong, Hyo-Min ; Chung, Han-Shik ; Lee, Kwang-Sung ; Tanshen, Md.Riyad ; Lee, Tae-Jin ; Lee, Sin-Il ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 47~53
DOI : 10.9726/kspse.2013.17.6.047
The article focuses on the Temperature characteristics inside single loop oscillating heat pipe (OHPs). In this paper, heat pipe is experimentally studied thereby providing vital information on the parameter dependency of their thermal performance. The impact depiction has been done for the variation of tube model of the device. OHPs are made of copper capillary tubes of outer diameter 6.25 mm, inner diameter 4 mm heated by constant temperature water bath cooled by ambient temperature. Using four types of OHPs of copper capillary tubes length of 1500mm and HP length 650mm inside tubes working fluid is R-22 Pressure 8 bar and mass 34g,32g,28g,16g. The results indicate a strong influence of filling ratio on the performance.
A Numerical Study on the Design of Exchanger for Desiccant Dehumidifier
Kim, Chi-Wan ; Ahn, Young-Chull ; Kim, Gil-Tae ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 54~62
DOI : 10.9726/kspse.2013.17.6.054
A numerical analysis is performed to evaluate mass flow balance in the heat exchanger for the dehumidifier. To improve the mass flow balance for maximum heat transfer performance, inlet, outlet and baffle are changed. Mass flow balance is evaluated by non-uniformity of flow which is the same concept with the standard deviation. Usually, there will occur many paths between the inlet and the outlet, however, it will follow shortest and low resistance ways. The uniform distribution of flow is numerically analyzed for several types of heat exchangers. Making the shortest way between the inlet and the outlet is most important factor. Two types of heat exchangers are installed in the dehumidifier and 4 cases of Type A heat exchangers and 3 cases of Type B heat exchangers are evaluated and optimized. The result of this research is applied to design heat exchanger for commercial dehumidifiers.
Dust Collection Characteristics of Multi-layer Multi-stage Porous Plate System with Ionizer and Dielectric-substance
Yoa, Seok-Jun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 63~72
DOI : 10.9726/kspse.2013.17.6.063
The main purpose of this study is to analyze the collection characteristics of multi-layer multi-stage porous plate system with ionizer and dielectric-substance experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with experimental parameters such as applied voltage, inlet velocity, stage number and inlet particle concentration, etc. In results, for multi-layer multi-stage porous plate system of inflow type, at 5 stage and
Experimental Study on the Aerodynamic Performance Characteristics of a Small-Size Axial Fan with the Different Depths of Bellmouth
Kim, Jang-Kweon ; Oh, Seok-Hyung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 73~78
DOI : 10.9726/kspse.2013.17.6.073
A Small-size axial fan(SSAF) has widely been utilized to circulate a cooling air in a refrigerator, etc. Generally, the aerodynamic performance of SSAF is strongly dependent upon the depth between SSAF and bellmouth, and it includes axial, partially stalled, mostly stalled and radial flow regions according to the flow coefficient. In this study, four kinds of bellmouth depths were considered to analyze the aerodynamic performance of SSAF. As a bellmouth depth increases, a maximum flowrate decreases, but a maximum static pressure increases. Also, stall region includes an inflection point in all aerodynamic performance curves. Finally, a static pressure efficiency shows the maximum value of 37%.
A Study on the Enhancement of Cooling Efficiency for the Cabinet of Automatic Controller in the Interior of Industrial Building
Kim, Soon-Ho ; Park, Hyun-Jung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 79~87
DOI : 10.9726/kspse.2013.17.6.079
The improvement of cooling efficiency for the cabinet of automatic controller is the most efficient method of it`s application. Therefore, this study has been analyzed and investigated the improvement of cooling efficiency and reduction of energy for the cabinet of automatic controller, respectively. So this study was conducted to enhancement of cooling efficiency for the cabinet of automatic controller by making a structure which produces difference of air pressures in the entrance tube of external air. And the structure has capacity of the pyrogen source (PTC elements) to make temperature range from
. Consequently, temperatures of the upper, the lower in the interior of the cabinet of automatic controller and the exhaust part were revealed
(average temperature of the exhaust part in case of existing method :
) in target test of this study, respectively. It was found that the cabinet of the automatic controller has better cooling ability than the cabinet of automatic controller by using an existing method.
An Experimental Study on Applying Heat Pump System to Facility Horticulture House
Kim, Jae-Dol ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 88~94
DOI : 10.9726/kspse.2013.17.6.088
As the results of analysis that are applying a heat pump using underground water as heat source of facility horticulture house, temperature change in house, growth of cultivated plants and the crop characteristic, the conclusion can be acquired as follows. It was possible to maintain the chamber temperature through operating heat pump with setting goal temperature at
and temperature variation at
. And cooling and heating coefficient of performance in heat pump system are different from setting room temperature and operation condition of equipment, totally in case that the setting temperature in house is low, the coefficient of performance and the in case that temperature departure is low. In case that the house does not heated, the result of the growth characteristic of cucumber planted last 50days is that cucumber grown in house equipped with heat pump is the most favorable growth characteristic due to maintaining a constant room temperature. After 90 days, the quantity and weight cucumber harvested in each house are averagely 9.8%, 13.1% increase and more heavy weight respectively. So it is researched that crop characteristic is superior.
Experimental Investigation on the Drag Reduction Mechanism of Outer-layer Vertical Blades Array using Stereoscopic Time-Resolved PIV
Lee, Inwon ; Park, Seong-Hyeon ; Chun, Ho-Hwan ; Hwang, Arom ; An, Nam-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 95~101
DOI : 10.9726/kspse.2013.17.6.095
A stereo PIV measurements in a circulating water channel has been performed to investigate the skin friction reduction mechanism of the outer-layer vertical blades first devised by Hutchins. In a recent PIV measurement study, considerable skin friction reduction was achieved as much as 2.73%~7.95% by outer-layer vertical blades array. In the present study, the influence of vertical blades array upon the characteristics of the turbulent coherent structures was analyzed by proper orthogonal decomposition method. It is observed that the vortical structures are cut and deformed by blades array and also the turbulent intensity and the Reynolds stress were weakened by the blades. These phenomena strongly associate the skin-friction drag reduction mechanism in the turbulent boundary layer flow.
Performance Characteristics of a Mixed Refrigerant OTEC Power Cycle Using Hot Waste Water
Yoon, Jung-In ; Son, Chang-Hyo ; Heo, Jeong-Ho ; Ye, Byoung-Hyo ; Kim, Hyun-Ju ; Lee, Ho-Saeng ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 102~107
DOI : 10.9726/kspse.2013.17.6.102
In this paper, the performance analysis for evaporation capacity, total work and efficiency of the ocean thermal energy conversion(OTEC) power system using mixed refrigerant(R32,R152a) is conducted to find the effect of hot wasted water on OTEC power system. The system in this study is applied with two stage turbine, regenerator, cooler and separator on Organic Rankine Cycle. The commercial program HYSYS is used for the performance analysis. The main results were summarized as follows : The efficiency of the OTEC power cycle has a largely effect on the evaporation capacity and total work. As increasing temperature of heat source water, evaporator`s capacity is decreased but total work increase. Otherwise, using hot wasted water bring effects not only increasing system efficiency but also declining evaporator`s capacity. Thus With a thorough grasp of these effect, it is necessary to find way to use hot wasted water emitted by power plant and so on.
Process Optimization for Co-based Self-flux Alloy Coating by Taguchi Method
Lee, Jae-Hong ; Kim, Yeong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 108~114
DOI : 10.9726/kspse.2013.17.6.108
This paper describes process optimization for thermal-sprayed Co-based self-flux alloy coating by Taguchi method. Co-based self-flux alloy coatings were fabricated according to
orthogonal array using flame spray process. Hardness test and wear test were performed, the results were analyzed by analysis of variance(ANOVA) considering a multi response signal to noise ratio(MRSN). From the results of ANOVA, the optimal combination of the flame spray parameters on Co-based self-flux alloy coating could be predicted. The calculated hardness and wear rate of the coatings by ANOVA were found to be close to that of confirmation experimental result.
Effect of Hot Forging on the Hardness and Toughness of Ultra High Carbon Low Alloy Steel
Kim, Jong-Beak ; Kang, Chang-Yong ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 115~121
DOI : 10.9726/kspse.2013.17.6.115
This study was carried out to investigate the effect of hot forging on the hardness and impact value of ultra high carbon low alloy steel. With increasing hot forging ratio, thickness of the network and acicular proeutectoid cementite decreased, and than were broken up into particle shapes, when the forging ratio was 80%, the network and acicular shape of the as-cast state disappeared. Interlamellar spacing and the thickness of eutectoid cementite decreased with increasing forging ratio, and were broken up into particle shapes, which then became spheroidized. With increasing hot forging ratio, hardness, tensile strength, elongation and impact value were not changed up 50%, and then hardness rapidly decreased, while impact value rapidly increased. Hardness and impact value was greatly affected by the disappeared of network and acicular shape of proeutectoid cementite, and became particle shape than thickness reduction of proeutectoid and eutectoid cementite.
Effect of Ni and Mn on Strain Induced Martensite Behavior of 22Cr Micro-Duplex Stainless steel
Park, Jun-Young ; Kim, Gi-Yeob ; Ahn, Yong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 122~129
DOI : 10.9726/kspse.2013.17.6.122
The microstructure and deformation behavior in 22Cr-0.2N micro-duplex stainless steels with various Ni and Mn contents were compared using by OM, TEM, and XRD. The 22Cr-0.2N duplex stainless steel plates were fabricated and hot rolled, followed by annealing treatment at the temperature range of
. All the samples showed the common strain hardening behaviour during the tensile test at a room temperature. The steels tested at the temperatures of
showed a distinct inflection point in the stress-strain curves, which should be resulted from the formation of strain-induced martensite(SIM) of austenite phase. This was confirmed by TEM observations. The onset strain of a inflection point in a stress-strain curve should be depended up the value of
. With the decrease of the tensile test temperature, the inflection point appeared earlier, and the strength and fracture strain were higher. The tensile behaviour was discussed from the point of austenite stability of the micro-duplex stainless steels with the different Ni and Mn content.
A Study on Characteristics of Performance by Heavy-Duty Diesel Engine on Construction Machine with EGR Cooler System
Oh, Sang-Ki ; Kim, Jin-Iyul ; Lee, Seung-Ho ; Song, Ho-Young ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 130~135
DOI : 10.9726/kspse.2013.17.6.130
It is a research about the change in reduction efficiency and performance resulting from installation of the EGR cooler, which is the core technology reducing NOx in response to standards been tightened of exhaust controls for off-road vehicle. It can reduce NOx by altering combustion temperature and oxygen concentration by recycling high-temperature exhaust gas. The target engine was large diesel engine for construction machine through by which we were able to verify a rate of change in output and capabilities for a heat-exchange within cooler itself depending on the existence of EGR cooler system. We have acquired a emission reduction technology for a construction machine by testing the reduction performance and rate of change in output.
A study on the availability of underground air for heating/cooling energy in volcano-stratigraphic
Kim, Yong-Hwan ; Kim, Sung-Man ; Lee, Dong-Won ; Hyun, Myun-Taek ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 136~141
DOI : 10.9726/kspse.2013.17.6.136
This study introduces and analyzes the energy for heating and cooling system in region with volcano-stratigraphic. The thermodynamic properties of air through the air blower installed at the entrance of borehole are measured. It estimates the availability of underground air for heating and cooling system through experimental data and theoretical analysis. Based on our conclusion from these calculations we predict possibility of over 40kW steady and stable energy source from underground. Therefore this underground air can be utilized in region with volcano-stratigraphic.
Development of a High-power Ultrasonic System for Sonochemistry Reaction
Lee, Yang-Lae ; Kim, Hyun-Se ; Baek, Min-Hyuck ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 142~148
DOI : 10.9726/kspse.2013.17.6.142
High-power ultrasonic promotes a chemical reaction by its own energy, thus it has been used for sonochemistry applications. For example, it has been mostly used for mixing, reaction catalyst, dispersion and disintegration. High-power ultrasonic transducer is made with structure based on a Bolt-clamped Langevin type Transducer (BLT), But it has difficulty in the development because degradation of piezoelectric ceramic by the heat generation of BLT. In this study, for a development of the transducer of 25 kHz and 1000 W used in sonochemistry and industrial cleaning, BLT with a hole in its center and tubular type waveguide of the transducer were designed based on finite element method (FEM). The transducer was fabricated based on the design parameter, and the impedance characteristics are measured experimentally and compared with the numerical results.
Optimization of NOx Emission with Blends of Bio-diesel Oil and Diesel Fuel Using Design of Experiments
Lee, Sang-Deuk ; Kim, Kyong-Hyon ; Lee, Han-Seong ; Jung, Suk-Ho ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 6, 2013, Pages 149~155
DOI : 10.9726/kspse.2013.17.6.149
Since bio-diesel oil has a merit that it satisfies both demand of substitution for fossil fuel and reduction in carbon dioxide emission, it is widely used in diesel engines by blending in gas oil in small quantity. It is needed to reduce in NOx emission in some way or others if blending ratio of bio-diesel oil is going to increase, because it is demerit that bio-diesel oil emits more NOx emission than gas oil. In this study, it was accomplished to optimize 3 factors what effect on NOx emission as blending ratio of bio-diesel oil, injection timing and common rail pressure with an introduction of a design of experiments, in order to minimize a number of tests. It was cleared that to introduce the design of experiments was very available in NOx optimization.