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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 11, Issue 4 - Nov 2007
Volume 11, Issue 3 - Aug 2007
Volume 11, Issue 2 - May 2007
Volume 11, Issue 1 - Feb 2007
Selecting the target year
In-Cylinder Air Flow Measurements and Turbulent Kinetic Energy Analyses
Yoo, S.C. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 5~11
Study on Low Pressure Loop EGR System for Heavy-duty Diesel Engine to Meet EURO-5 NOx Regulation
Lee, K.S. ; Baek, M.Y. ; Park, H.B. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 12~17
Recently, many small and medium size diesel vehicles have been equipped with turbocharger and EGR system to get high performance and reduce
emissions but its application to heavy-duty diesel engine is not common yet. In this work, the simulation model for EURO-3 engine was developed using WAVE and then its performance and emission level were verified by comparing with experimental results. The possibility of current EURO-3 engine equipped with LPL EGR system which would be satisfied the EURO-5 regulation are examined. ESC 13 mode was chosen as the primary engine test mode, and the injection timing and fuel quantity were changed to compensate the lost engine performance caused by EGR. The system developed in this study shows that the current EURO-3 engine could satisfy EURO-5
regulation by applying LPL EGR.
Effects of intake flows on spray structure of a high pressure multi-hole injector in a second generation direct-injection gasoline engine
Kim, S.S. ; Kim, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 18~25
Characteristics of Exhaust Emission by Impinging Spray of Diesel Engine
Jin, Y.S. ; Kim, J.D. ; Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 26~31
Recently, study on the improvement of combustion performance for the diesel engine by using the impinging spray in the combustion chamber has been actively studied. The purpose of this study is to examine the variation of exhaust emission between the trial engine with impinging plate and the prototype engine in accordance with change of fuel injection timing and fuel injection pressure. The concentration of nitrogen oxide of trial engine decreased more than 50% compared to prototype engine. However, smoke of trial engine indicated very high concentration compared to prototype engine. The effect of fuel injection timing on the nitrogen oxide and smoke indicated different results, that is, the concentration of nitrogen oxide decreased as the degree of fuel injection start become slower, whereas the concentration of smoke decreased as the degree of fuel injection start become faster.
A Study of Bubble Pump that is applied Solar Heating Water System
Park, G.T. ; Song, L. ; Shim, K.J. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 32~37
Regarding the need of energy in advance and the depletion of fossil fuel energy, all researches around the world now are trying to extract energy from many alternative sources especially the renewable one. Solar, ocean tidal, wind and geothermal energy are renewable energy fields which many researches are focused on. This paper explains about effort to replace electric pump used in solar water heating system by bubble pump. The utilization of bubble pump in this system is very efficient since it needs heat energy for its operation that can be obtained easily. In addition, it can also simplify the construction of the system. Bubble pump also functions as a controller to circulate water inside the system. Before the installation of bubble pump, the special quality and performance of bubble pump should be analyzed. The result got from the analysis could show the fluctuation of water flow rate occurred because it sensitively reacts to the heat quantity. Here the heat quantity is taken from the solar that, as we know, is not stable in a whole day. Problems often occurred are the flow rate in this system is very low moreover it could be stop if the pressure exceeds the limit.
The CFD Analysis Comparison of Several Snubbers with different Buffer Width
Lee, G.H. ; Shim, K.J. ; Lee, Y.H. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 38~43
Pulsation is an inherent phenomenon in reciprocating compressors. It interacts with piping to cause vibrations and performance problems. Indiscriminately connecting to a compressor can be dangerous and cost money in the form of broken equipment and piping, poor performance, inaccurate metering, unwanted vibration, and sometimes noise. Piping connected to a compressor can materially affect the performance and response. To minimize these detrimental effects, reciprocating compressor system should be equipped by pulsation suppression system. The system usually comprises bottle volume, called snubber. Snubber is one of the most important parts in hydrogen compressing system. It has installed reciprocating hydrogen compressor. One of these components is snubber which has function to reduce pulsation waveform and to remove the impurities in the hydrogen gas. A snubber has an inclined plate as a buffer, which is installed inside snubber. When the pressure loss and the pulsation of pressure within a snubber is minimized, the snubber could get more applicability. Therefore, a study to find an optimum geometric size on a several snubbers which have different buffer width, has been conducted using a numerical analysis.
Effects of Particle Concentrations on Friction Factors and Pressure Drops in a Horizontal Pipe
Ahn, S.W. ; Lee, B.C. ; Kang, H.K. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 44~49
Generally, the economic concept of optimized design and operating conditions in fluidized bed heat exchangers can hardly be realized. Because the lack of fundamental knowledge about the particle flows, the optimum design of the fluidized bed heat exchanger is rather limited. In the present work, measurements are made on pressure drops and friction factors in the horizontal circular tube with solid particles in the circulating water. Two different solid particles of diameters of 3mm and 4mm are covered. The Reynolds numbers are ranged from 10,000 to 45,000. It is concluded that the friction factors for the particles of 4mm diameter are much higher than those for the particles of 3mm diameter. And at the lower particle concentration, the friction factors are strongly influenced by the fluid velocity rather than the particle concentration; However, the effect of the particle concentration on friction factors is also significantly higher at a higher particle concentration operating condition.
The Characteristic of Propane(R290)-Ethane(R170) as Refrigerant in the Cascade Refrigeration System
Kim, P.H. ; Lee, B.H. ; Jeong, H.M. ; Chung, H.S. ; Kim, C.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 50~55
Nowadays, demands on super low temperature condition for industrial and commercial uses are thriving. Considering of its wide application in the present and the future, study of the super-low temperature refrigeration system should be actively carried out. This study is aimed to investigate refrigeration capacity and coefficient of performance(COP) of the cascade refrigeration system, as well as to get the system which can reach evaporator temperature of
. For this purpose, R290 and R170 are charged in high stage and low stage respectively. Finally the characteristics of system using R290 and R170 will be proposed. Additionally, In this experiment, the flow rate of air flowing through the LS evaporator and the compressor inlet pressure were varied to investigate the refrigeration capacity and coefficient of performance characteristics.
Characteristics of the Mixed Convection Flow and Heat Transfer in a Channel with Open Cavity
Ko, Y.C. ; Bae, D.S. ; Kim, N.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 56~64
A numerical simulation is carried out mixed convection in horizontal channel with a heat source from below of rectangular cavity. Finite volume method was employed for the discretization and PISO algorithm was used for calculating pressure term. The parameters governing the problem are the Reynolds number (
), the Rayleigh number (
), the Prandtl number (
), the aspect ratio (
) and the angle of inclination (
). Mean Nusselt number distributions were obtained and effect of Reynolds number, Rayleigh number and Prandtl number on mixed convection in the horizontal channel with rectangular cavity were investigated.
Vibration Characteristics of Worm Gear Faults for Elevators
Lee, S.J. ; Yang, B.S. ; Lee, S.S. ; Park, S.T. ; Son, J.D. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 65~71
According to the survey, abnormal condition of the system is the main source for interrupting an elevator service, especially faults in worm gears used for the traction machine. Worm gear is popularly used in traction machine for middle and low speed elevators. Elevators need high reliability and stability, because they are closely related to human life. Usually, traction machine is applied to drive the elevators that have height about 35 m and it is an important mechanical unit for riding quality in elevators. There are some research results about types of vibration fault for worm gear in International Association Elevator Engineers (IAEE). But this study concerns with diagnosis of various faults in elevator worm gear using vibration signal. The analysis of fault characteristics is compared with previous researches in traction machine.
A Study on the Development of a Resonator to Reduce the Ship Engine Room Noise
Yu, Y.H. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 72~77
It is known that elimination of ship engine room noise is impossible thing, so the working environment in the engine room is getting worse because ships are recently built with huge engines to take higher sailing power. In the yacht and cruise yacht, the engine room noise is more serious because they have bigger engines relative to their hull sizes. The noise generated from the main engine makes the employee to hearing loss and the transmitted noise make the uncomfortable conditions in the cabins of ship. The noise generated by ship engine must be attenuate for the employee and passenger. In yacht and cruise yacht, the noise levels in cabines are the most important criterions to the value of commodities. In this study, the noise absorbtion barrier which have resonators is experimentally studied by the 1/3 octave band noise elimination rates(%).
In-Plane Vibration Analysis of General Plates
Choi, M.S. ; Yeo, D.J. ; Byun, J.H. ; Suh, J.J. ; Yang, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 78~85
In order to analyze accurately the vibration of a structure by using the finite element method (FEM), we have to model a analytical structure as a numerical model with many degrees-of-freedom. However, in this case, the FEM needs much computation time and storage. The authors developed the finite element-transfer stiffness coefficient method (FE-TSCM) for overcoming the drawback of the FEM. In this paper, the authors apply the FE-TSCM to the in-plane vibration analysis of general plates with various shapes. Two numerical examples, a rectangular plate and a triangular plate, are used to compare the results of the FE-TSCM and the FEM. Through the numerical calculation, we confirm that the FE-TSCM can be applied to the in-plane free or forced vibration analysis of the general plates with various shapes and is effective to in-plane vibration analysis of general plates.
Effect of Subzero Treatment on the Mechanical Properties and Damping Capacity of Austempered Ductile Cast Ironn
Lee, K.H. ; Kwon, M.K. ; Kim, C.G. ; Kang, C.Y. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 86~91
This study was investigated to know the effect of subzero treatment in austempered ductile cast iron. Retained austenite transformed to martensite by subzero treatment. With decreasing subzero treatment temperature, more volume fraction of retained austenite transformed to martensite and transformed to martensite above 30% by subzero treatment temperature at
. With decreasing subzero treatment temperature, the value of strength and hardness increased but the value of elongation and impact value decreased. In case of subzero treatment at
, hardness value increased about 18% and impact value decreased by above 20%. We could find that subzero treated specimens had a little of effect on the tensile properties but had very much effect on the hardness and value of the impact.
Effects of Counterpart Materials on Wear Behavior of Thermally Sprayed Ni-based Self-flux Alloy Coatings
Kim, K.T. ; Kim, Y.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 92~97
This study aims at investigating the wear behavior of thermally sprayed Ni-based self-flux alloy coatings against different counterparts. Ni-based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then heat-treated at temperature of
. Dry sliding wear tests were performed using the sliding speeds of 0.2 and 0.8 m/s and the applied loads of 5 and 20 N. AISI 52100,
balls were used as counterpart materials. Wear behavior of Ni-based self-flux alloy coatings against different counterparts were studied using a scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy (EDX). It was revealed that wear behavior of Ni-based self-flux alloy coatings were much influenced by counterpart materials.
A Study on the Measurement Method of Leakage for Pneumatic Cylinder
Jang, J.S. ; Ji, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 98~102
In this study, a measurement method of leakage flow-rate for pneumatic driving apparatus is proposed. The existing measurement methods of leakage flow-rate of air need disassemble the test component. Therefore, there is no effective method to measure the leakage flow-rate while operating pneumatic driving apparatus. In this study, the leakage flow-rate is measured from the pressure change in an isothermal chamber that can realize isothermal conditions by stuffing the steel wool into it. Therefore, a wide range of flow-rate could be measured only from the pressure response and the leakage flow-rate can be measured during operating pneumatic driving apparatus. The effectiveness of the proposed method is proved by experimental results.
Measurement and Control of Swing Motion Using Image Sensor
Kim, Y.B. ; Kawai, H. ; Choi, Y.W. ; Lee, K.S. ; Chae, G.H. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 4, 2007, Pages 103~108
In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In many papers reported by us, we suggested a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. The measuring system is based on laser sensor or others. However it is not so useful in real world. Especially, in this paper, the image sensor is used to measures the motions of the spreader and the measured data are fed back to the controller in real time. The applied image processing technique is a kind of robust template matching method which is named Vector Code Correlation (VCC) and devised to consider the real environmental conditions. And the
based control technique is applied to suppress swing motion of the crane. And the experimental result shows that the proposed measurement system based on image sensor and control system is useful and robust to disturbances.