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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
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Dec 2014
Volume 18, Issue 5 - Oct 2014
Volume 18, Issue 4 - Aug 2014
Volume 18, Issue 3 - Jun 2014
Volume 18, Issue 2 - Apr 2014
Volume 18, Issue 1 - Feb 2014
Selecting the target year
Technical Trend of Performance Analysis of Pilot Valve for Ultralow Temperature
Lee, Jung-Jin ; Yoon, Jung-In ; Son, Chang-Hyo ; Moon, Jung-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 5~10
DOI : 10.9726/kspse.2014.18.5.005
A Study on Distillation Property of Automotive Gasoline and Diesel Fuel
Youm, Kwang-Wook ; Kim, Sang-Jin ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 11~15
DOI : 10.9726/kspse.2014.18.5.011
Currently, there are active researches being conducted on a new combustion technology that can reduce emission quantity while enhancing vehicle performance as well as Improving fuel quality. In a gasoline engine that uses petroleum, high volatility makes it easy to jump spark ignition and prevent knocking phenomenon that occurs inside an engine. In a diesel engine that uses diesel fuel, high volatility reduces combustion residues and toxic gas and is therefore good for protecting the environment. Therefore, for fuel used in a vehicle, volatility is an important factor that influences not only engine performance but also environmental protection. This research conducted a distillation experiment using gasoline and diesel fuel for vehicles produced by domestic oil companies. The test was conducted in accordance with the method of distillation experiment described in KS M ISO3405. In addition, it used the result of analysis from the experiment to examine visual distillation characteristics of each fuel and developed a formula based on distillation temperature.
A study on Motion Characteristics of VLCO by Draft (Simple floating body)
Lee, Seung-Chul ; Bae, Sung-Yong ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 16~21
DOI : 10.9726/kspse.2014.18.5.016
The structure of the variable liquid column oscillator(VLCO) is analogous to that of the tuned liquide column damper used to suppress oscillatory motion in large structures like tall buildings and cargo ships. VLCO is the technology to absorb high potential energy made by process of accelerated motions to occur the effect of an air spring by installation of inner air chamber. So, the application of VLCO can obtain to improve efficiency of energy than wave energy converters made in Pelamis Company. In this research, the experiments were carried out for the motion characteristics of simple floating body by varying the amount of internal fluid. The experimental results were compared with the calculated results.
Performance Characteristic of Large Diameter Oval Finned-Tube Heat Exchanger for Dryer
Bae, Kyung-Jin ; Cha, Dong-An ; Kwon, Oh-Kyung ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 22~27
DOI : 10.9726/kspse.2014.18.5.022
The objectives of this paper are to obtain an empirical equations regarding the correlations between heat transfer and pressure drop of oval fin-tube heat exchanger having large diameter using wilson plot method. It was difficult to find any recommendable heat transfer and friction factor correlation available for our large diameter experimental cases. Overall heat transfer coefficients are composed of the heat transfer coefficients both inside and outside tubes. The resulting empirical correlations for the Nui and f-factor are given as
, respectively. The empirical correlations of the Nui and f-factors were developed for the large diameter oval finned-tube heat exchanger as a function of the Reynolds number. As the EG(Ethylene glycol) and air flow rate increases, the heat transfer rate and pressure drop is increased largely.
Optimum PI Controller Design for an Oil Cooler System Using GA
Jung, Young-Mi ; Jeong, Seok-Kwon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 28~34
DOI : 10.9726/kspse.2014.18.5.028
This paper deals with optimum PI controller design using genetic algorithm to improve control performance and robustness for an oil cooler system. The optimum PI gain was found to minimize an object function, integrated absolute error, and to satisfy control design specifications such as overshoot and settling time based on practical transfer function of the oil cooler system. The control performance and robustness were investigated by comparing indicial responses and Bode diagram analysis with respect to three kinds of PI gains obtained from different gain decision manners. Moreover, the robustness against to input disturbances, sinusoidal wave form and abrupt single pulse, was evaluated. The computer simulation results showed that the suggested optimum gain can establish desirable control performance and strong robustness with easy design process.
A Study on The Flame Stability of Pellet Combustor Using Swirling Flow
Lee, Do-Hyung ; Yun, Bong-Seok ; Wang, Zhen-Wei ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 35~41
DOI : 10.9726/kspse.2014.18.5.035
The wood pellet, which is one of the woody biomass energy, has very high economic efficiency and combustion efficiency during their combustion. The existing pellet burner have many problems such as low combustion efficiency, flame stabilization, ash problem and ignition time etc. We developed cyclonic wood pellet burner aim to 20,000kcal/hr boiler and measured temperature profiles and exhaust gases in order to investigate the flame stability and optimum combustion condition at any air flow conditions. As results, we confirmed the reappearance and the isotropy of the experimental results in the burner. At the first air flow inlet condition of excess air ratio
, second air flow
had the best combustion condition when pellet supplied 30g. This result means that we need much air supply only for the swirling of second air flow. So we tested various second air flux at first air excess air ratio
condition. At this condition, we could find out that we don't need much second air and total air flux compared to the former condition. We will continuously test this work of air flow distribution, and swirl effect of first air flow, and ash elimination.
Performance Comparison of Supercritical Heat Pump for a Variety of Refrigerants
Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ; Jeon, Min-Ju ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 42~47
DOI : 10.9726/kspse.2014.18.5.042
In this paper, the cycle performance analysis for the COP of supercritical heat pump using various refrigerants is presented to offer the basic design data for the operating parameters of the system. The working fluids are R134a, R22, R32, R290, R600, R600a, R1270 and R744. The operating parameters considered in this study include superheating degree of evaporator, temperature of gas cooler inlet and outlet, compressor efficiency and evaporating temperature in the supercritical heat pump system. The main results were summarized as follows : Superheating degree, temperature of gas cooler inlet and outlet, compressor efficiency and evaporating temperature of supercritical heat pump system have an effect on the COP of this system. With a thorough grasp of these effect, it is necessary to design the supercritical heat pump using R134a. And, in comparison of COP of supercritical heat pump using various refrigerants, R32 and R600 is the highest, and R744 is the lowest among other refrigerants. From these results, it is confirmed that the COP of supercritical heat pump using R744 is higher than that using freon refrigerants such as R32 and R134a.
Performance Comparison of Hot-gas Bypass Types with the Variation of Refrigeration Load
Baek, Seung-Moon ; Yoon, Jung-In ; Son, Chang-Hyo ; Heo, Jung-Ho ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 48~54
DOI : 10.9726/kspse.2014.18.5.048
In this paper, three refrigeration systems bypassing hot-gas to compressor outlet, compressor and condenser outlet and evaporator inlet are theoretically compared to offer basic design data for performance depending on cooling load using a HYSYS program. The main results are summarized as follows : First, the COP of third system is the highest. Next, the COP of second system is higher than first one. And, the temperature of compressor inlet of third system is constant for all cooling load. Compared to first and second system, the compressor inlet temperature of the first system is higher than second one for all cooling loads. From the above results, third system, which is bypassing hot-gas to evaporator inlet, is more advantageous when considering the precise temperature control and excellent performance of oil and water cooler of industrial machine.
A Study on the Humidity Paper for Indicating Moisture Absorbed in R-22
Kim, Si-Young ; Ju, Chang-Sik ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 55~59
DOI : 10.9726/kspse.2014.18.5.055
This study performed experimental research to visualize the moisture content absorbed in R-22, refrigerant of refrigerator. Sulfuric acids were mixed with bromothylmol blue solution to make indicating solutions, and humidity papers were prepared by impregnation of the indicating solutions into solid supporters. Prior to the impregnation, small amount of lithium chloride was added into indicating solution. Moisture measuring cell was composed to test sensitivity of the humidity papers. Color changing characteristics of the humidity papers were also examined at various moisture contents in R-22. Color of the humidity paper varied linearly with the moisture content in R-22 in the range from 150 ppm to 300 ppm. The humidity papers showed complete color change to yellow at the moisture content of 300 ppm within 8 hours.
Numerical Analysis on Posterior Prosthesis of Implant Temporary Teeth Combination Bridge
Seo, Kyung-Hyo ; Lee, Chi-Woo ; Moon, Byung-Cheol ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 60~65
DOI : 10.9726/kspse.2014.18.5.060
This research examined an immediate loading capable of providing a masticatory function and financial affordability while satisfying every requirement of a useful immediate loading. In this research, numerical value analysis was performed on couple-type posterior teeth implants developed by making up for the problems of extant implants. As a result of examining the effects of external impacts on extant implants and their deformation, relatively lager deformations separated from a molar were found concerning molar deformation implant with the maximum deformation level being approximately 1.657mm. In this research, the improved implant showed much improvement in terms of impact analysis in its deformation dispersion status after unloading the impulsive load from a punch. As for the case of hepf, about 1.657mm occurred but the improved model showed about 0.9217mm, exhibiting 55.6% advancement.
Damage Behavior of Elbow Pipe with Inner or Outer Local Wall Thinning under Internal Pressure
Kim, Soo-Young ; Nam, Ki-Woo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 66~73
DOI : 10.9726/kspse.2014.18.5.066
This study was considered to occur the local wall thinning at elbow which is flowing the steam and high-pressure water of high-temperature. The angle of elbow is
. The damage behaviors of inner or outer wall thinning elbow under internal pressure were calculated by FEA(finite element analysis). We compared the simulated results by FEA with experimental data. The FEA results are as follows: In the FEA results of three types of wall thinning ratio, the circumferential and longitudinal stresses show the similar values regardless of the angle of elbow, respectively. The circumferential strain was greater at elbow of small angle, but the longitudinal strain was nearly same. The FEM stress of outer wall thinning elbow was slightly higher than that of the inner wall thinning elbow, and strain was also slightly higher. In the experiments, the circumferential strain was increased with the increase in the internal pressure, and increased rapidly on about 0.2% of strain. The longitudinal strain was small. The strain at break was much smaller than 0.2%. In the relation between pressure and eroded ratio, the criteria that can be used safely under operating pressure and design pressure were obtained. The results of FEA were in relatively good agreement with those of the experiment.
Effect of Applied Load and Sliding Speed on Wear Behavior of Thermally Sprayed STS316 Coating
Lee, Jae-Hong ; Kim, Yeong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 74~79
DOI : 10.9726/kspse.2014.18.5.074
This article aims at investigating the effect of applied load and sliding speed on wear behavior of thermally spraryed STS316 coating. STS316 coatings were fabricated by flame spray process according to optimal parameters on steel substrates. Dry sliding wear tests were performed on STS316 coating using four different applied load as 10, 15, 20 and 25 N and four different sliding speed as 15, 30, 45 and 60 rpm. Wear behavior on worn surface was investigated using scanning electron microscope(SEM) and energy disperive X-ray spectroscopy(EDS). The dominant wear mechanism of STS316 coating under low applied load and sliding speed was oxidation on worn surface. However, under high applied load and sliding speed the principal wear mechanism was abrasion on oxidation film and damage of oxidation film.
Failure Behavior of T-joint Pipe with Outer Local Wall Thinning under Internal Pressure
Kim, Soo-Young ; Nam, Ki-Woo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 80~87
DOI : 10.9726/kspse.2014.18.5.080
The pipelines are apt to erosion or corrosion because of the high-speed flow of water and steam with high temperatures or high pressures. This study was carried out a finite element analysis (FEA) and an experimental for the fracture behavior of T-joint pipes with local wall thinning under internal pressure. Local wall thinning was machined on the pipes in order to simulate erosion and corrosion of the metal. The configurations of the eroded area included an eroded ratio of d/t=0.80~0.963 and an eroded length of l=25 mm, 50 mm, and 102 mm. Three-dimensional elastic-plastic analyses were also carried out using FEA, which accurately simulates failure behaviors. In regards to the relationship between pressure and eroded, the criterion that indicates what can be used safely under operating pressure and design pressure were obtained from FEA. The FEA results were in relatively good agreement with that of the experiment.
Performance Characteristics of OTEC(Ocean Thermal Energy Conversion) Power Cycle with Vapor-Liquid Ejector
Yoon, Jung-In ; Son, Chang-Hyo ; Kim, Hyeon-Uk ; Ha, Soo-Jung ; Lee, Ho-Saeng ; Kim, Hyun-Ju ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 88~93
DOI : 10.9726/kspse.2014.18.5.088
In this paper, the performance analysis of condensation and evaporation capacity, turbine work and efficiency of the OTEC power system using vapor-liquid Ejector is presented to offer the basic design data for the operating parameters of the system. The working fluid used in this system is
. The operating parameters considered in this study include the vapor quality at heat exchanger outlet, pressure ratio of ejector and inlet pressure of low turbine, mass flow ratio of separator at condenser outlet. The main results were summarized as follows. The efficiency of the OTEC power cycle has an enormous effect on the mass flow ratio of separator at condenser outlet. With a thorough grasp of these effects, it is possible to design the OTEC power cycle proposed in this study.
Effect Analysis in Laser Metal Deposition of SKD61 by Track Pitch
Kim, Won-Hyuck ; Jung, Byung-Hun ; Oh, Myeong-Hwan ; Choi, Seong-Won ; Kang, Dae Min ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 94~99
DOI : 10.9726/kspse.2014.18.5.094
In this study, AISI M2 powder was selected primarily through various literature in order to improve the hardness and wear resistance. Among the laser metal deposition parameters, laser power was studied to improve the deposition efficiency in the laser metal deposition using a diode pumped disk laser. SKD61 hot work steel plate and AISI M2 powder were used as a substrate and powder for laser metal deposition, respectively. Fixed parameters are CTWD, focal position, travel speed, powder feed rate, etc. Experiments for the laser metal deposition were carried out by changing laser power. Through optical micrographs analysis of cross-section in LMD track, effect of the major parameters were predicted by track pitch. As the track pitch increased, so the reheated zone width, the overlap width and the minimum thickness was decreased. The hardness was decreased in the HAZ area, the hardness in the reheated HAZ area was decreased significantly and regularly in particular.
Feasibility Study of Sludge Detection inside Pipes Using Torsional Guided Waves
Park, Kyung-Jo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 100~105
DOI : 10.9726/kspse.2014.18.5.100
It has been previously reported that in principle sludge and blockages can be detected and even characterized by using guided ultrasonic torsional waves, based on an idealized model in which the sludge layer was simplified in terms of geometry and material properties. The work revealed that the presence of a layer inside a pipe scatters the guided wave propagating in the pipe and both the reflection and transmission of the guided wave can be used to effectively detect and characterize the layer. This paper proceeds the work by taking into account more realistic sludge characteristics, including irregular circumferential profiles of the sludge layer and imperfect bonding state between the sludge and the pipe. The influence of these issues is investigated to identify the critical factors that influence the detection and characterization capability of the two measurements.
A Study on the Mechanical Properties of Composite Materials of Polyurethane Resin and CuO
Kim, Eun-Bong ; Koo, Su-Jin ; Jeong, Sang-Gu ; Kim, Seok-Hyeon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 106~114
DOI : 10.9726/kspse.2014.18.5.106
For the purpose of development of polyurethane sealing material, polyurethane resins reinforced with CuO were prepared from polyol and MOAC(4,4'-Methylenebis(2-chlorobenzeneamine)). And the effects of compositions on the mechanical properties of the reinforced polyurethane resin were experimentally examined. The polyurethane resin got to be thermally decomposed at
and completely carbonized around
. Tensile strength, elongation and hardness of the polyurethane resin increased with the content of MOCA. CuO was uniformly dispersed in the polyurethane resin by 1 minute's ultrasonic radiation. Tensile strength, elongation and hardness of the polyurethane resin reinforced with CuO increased with the content of CuO. Tensile strength and hardness of the reinforced polyurethane resin increased with particle size of the CuO, but elongation decreased. CuO showed higher tensile strength and hardness than any other additives, and lowest elongation.
An Experimental Investigation on Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Alloy 617/Alloy 617 Weld Joints
Choi, Pil-Ho ; Kim, Seon-Jin ; Kim, Woo-Gon ; Kim, Min-Hwan ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 115~121
DOI : 10.9726/kspse.2014.18.5.115
Alloy 617 is the one of the leading candidate materials for intermediate heat exchangers(IHX) of a very high temperature reactor(VHTR) system. Some of the components are joined by many welding techniques and therefore the welded joints are inevitable in the construction of systems. In the present paper, the low cycle fatigue(LCF) behaviors of Alloy 617 base metal(BM) and the gas tungsten arc welded (GTAWed) weld joints(WJ) are investigated experimentally under strain controlled LCF tests. Fully axial total-strain controlled tests have been conducted at room temperature with total strain ranges of 0.6, 0.9, 1.2 and 1.5%. The weld joints have shown a lower fatigue lives compared with base metals at all the testing conditions. The weld joints have shown a higher cyclic stress response behavior than base metal. Both BM and WJ exhibited cyclic strain hardening behavior, depending on the total strain range. In addition, the strain-life parameters for BM and WJ were determined, based on Coffin-Manson equations.
Evaluation of Fatigue Life on Alloy 617 Base Metal and Alloy 617/Alloy 617 Weld Joints under Low Cycle Fatigue Loading
Dewa, Rando Tungga ; Kim, Seon-Jin ; Kim, Woo-Gon ; Kim, Min-Hwan ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 122~128
DOI : 10.9726/kspse.2014.18.5.122
Generally, the mechanical components and structures are joined by many welding techniques, and therefore the welded joints are inevitable in the construction of structures. The Alloy 617 was initially developed for high temperature applications above
. It is often considered for use in aircraft and gas turbines, chemical manufacturing components, and power generation structures. Especially, the Alloy 617 is the primary candidate for construction of intermediate heat exchanger (IHX) on a very high temperature reactor (VHTR) system. In the present paper, the low cycle fatigue (LCF) life of Alloy 617 base metal (BM) and the gas tungsten arc welded (GTAWed) weld joints (WJ) are evaluated by using the previous experimental results under strain controlled LCF tests. The LCF tests have been performed at room temperature with total strain ranges of 0.6, 0.9, 1.2 and 1.5%. The LCF lives for the BM and WJ have been evaluated from the Coffin-Manson and strain energy based life methods. For both the BM and WJ, the LCF lives predicted by both Coffin-Manson and strain energy based life methods was found to well coincide with the experimental data.
Improvement on Sensorless Vector Control Performance of PMSM with Sliding Mode Observer
Wibowo, Wahyu Kunto ; Jeong, Seok-Kwon ; Jung, Young-Mi ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 129~136
DOI : 10.9726/kspse.2014.18.5.129
This paper proposes improvement on sensorless vector control performance of a permanent magnet synchronous motor (PMSM) with sliding mode observer. An adaptive observer gain and second order cascade low-pass filter (LPF) were used to improve the estimation accuracy of the rotor position and speed. The adaptive observer gain was applied to suppress the chattering intensity and obtained by using the Lyapunov's stability criterion. The second order cascade LPF was designed for the system to escalate the filtering performance of the back-emf estimation. Furthermore, genetic algorithm was used to optimize the system PI controller's performance. Simulation results showed the effectiveness of the suggested improvement strategy. Moreover, the strategy was useful for the sensorless vector control of PMSM to operate on the low-speed area.
A Comparative Study on Lightning Characteristics and Lightning Damage to Wind Turbines of Jeju and Gangwon Region
Yang, Dal-Seung ; Kim, Kyoung-Bo ; Ko, Kyung-Nam ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 137~143
DOI : 10.9726/kspse.2014.18.5.137
An investigation on lightning characteristics and damage to wind turbines was performed on Jeju and Gangwon regions. The lightning data from January 2010 to September 2013 detected by IMPACT ESP were collected and analyzed in detail. Hangyeong and Seongsan wind farms of Jeju province and Taebaek, Changjuk, Taegisan and Gangwon wind farms of Gangwon province were selected for this study. Lightning rates and lightning damage events at the six wind farms were compared with each other. Lightning maps for the two regions were drawn using lightning frequency data. As a result, lightning frequency of Gangwon region was higher than that of Jeju region, while lightning strength of Gangwon was weaker than that of Jeju. Lightning rates were assessed to be good for all of the six wind farms. No lightning damage to wind turbines occurred at the two wind farms of Jeju, while some lightning damage to wind turbines took place at the four wind farms of Gangwon.
A Study on the Design and Testing of 155mm Howitzer Silencer
Yeo, Chul-Mo ; Park, Sung-Ho ; Lee, Hae-Suk ; Kim, Young-Seop ; Chung, Han-Shik ; Jeong, Hyo-Min ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 144~149
DOI : 10.9726/kspse.2014.18.5.144
The silencer of 155mm caliber howitzer is developed to reduce its firing loud noise. This kind of research of a large gun was seldom because its big firing noise does not make significant effect even if to use silencer. Nowadays, military facilities became closely located civilian residential area. The noise would be regarded environmental pollution. So the noise reducing research becomes reconsidered. The previous silencer researches were only dealt with small guns as pistols and rifles moreover their theories was not properly analyzed for a large caliber silencer. The reason was previous researches of a large caliber silencer as 155mm howitzer were limited because their data based on simulation results without actual test by using computational fluid dynamics. In this study, the entire processes of silencer of 155mm caliber howitzer which were design, manufacturing, actual firing test, and analysis of its theories, were performed and showed. In particular, the actual noise of with silencer and without was measured and the results were compared to analyze the effect of silencer.
The Characteristic of Inverter Control by Variation of Refrigeration Load and Outdoor Temperature on Industrial Cooler
Baek, Seung-Moon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 150~155
DOI : 10.9726/kspse.2014.18.5.150
This paper presents The performance analysis of inverter control type-industrial cooler with respect to refrigeration load and outdoor temperature. Aside from materials about simulations and foundation data regarding inverter control compressors, currently, data about commercial coolers with inverter control still lack information for performance comparison. Thus, in this paper, the experiments are done to see characteristics of condensation capacity, evaporation capacity, compressor power and COP with respect to outdoor temperature and load by using a commercial inverter control cooler model. As a result, COP difference of the inverter control cooler with respect to load is 30% at the outdoor temperature of
, 29% at the outdoor temperature of
, 34% at
A Study of Behavior Characteristics of Biodiesel Fuel Spray
Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 5, 2014, Pages 156~163
DOI : 10.9726/kspse.2014.18.5.156
Diesel engine is most suitable one for biodiesel fuel because the compression-ignition diesel engine has desirable fuel consumption due to higher thermal efficiency and in addition, the improvement of the fuel consumption also leads to a reduction of
emission and then it does not need to have spark-ignition system, which means that there is less charge on the technic and complexity. In this study, the spray behavior characteristics of the vegetable palm oil were analyzed by using a common-rail injection system of commercial diesel engine and the results were compared with those obtained for the diesel fuel. The injection pressures and blend ratios of palm oil and diesel(BD3, BD5, BD20, BD30, BD50, and BD100) were the main parameters. The experiments were conducted for different injection pressures: 500bar, 1000bar, 1500bar, and 1600bar by setting injection duration to
. Consequently, it was 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 palm oil and diesel at a fixed injection pressure. In particular, all experiments showed the spray angle about