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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 9, Issue 4 - Nov 2005
Volume 9, Issue 3 - Aug 2005
Volume 9, Issue 2 - May 2005
Volume 9, Issue 1 - Feb 2005
Selecting the target year
Experimental and FEM Approach to Develop Optical Engine
Lee, K.S. ; Baek, M.Y. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 5~13
An Experimental Study of Spray Behaviors of Biodiesel blended fuels in a Common Rail Injection System
Choi, S.H. ; Oh, Y.T. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 14~18
In this study, the spray characteristics of blended fuels with biodiesel were investigated. The experiments were performed for the effect of mixing ratio and injection pressures on the spray behavior. Conventional diesel fuel and biodiesel fuel and blended fuels were used as test fuels. Through the spray visualization system, composed of a Halogen lamp and High speed camera. The process of spray injection was visualized. Fuel containing biodiesel has different spray pattern on account of the high viscosity and large surface tension. Through this experimental result, we found that, after solenoid driving pulse generates, the increase of injection pressure enables delay time to get shorter, but the increase of mixing ratio makes delay time lengthen.
The Effects of Intake Pulsating Flow on Volumetric Efficiency in a Diesel Engine
Kang, H.Y. ; Koh, D.K. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 19~25
Empirical experiments have been undertaken to investigate the effects of Intake Pulsating Flow on volumetric efficiency in a diesel engine. Waves occurs in the manifolds of engine owing to the periodic nature of the induction and exhaust processes caused by piston motion. During induction process, as waves travel both directions, they are reflected and interacted each other and pressure waves are transmitted through it. Hence, the flow become more complex and unsteady flow. These pressure waves act upon intake pulsating flow and affects on volumetric efficiency. In this paper the effects of change in length of induction pipes and wide range of engine speed on volumetric efficiency was examined and evaluated. It was found that volumetric efficiency was affected by intake pulsating flow with engine speed and the pipe length. The results obtained were considered by adopting a theory of wave action.
Engine Cycle Simulation and FEM Validation for LHR Engine Design
Lee, K.S. ; Baek, M.Y. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 26~32
It has been an earnest wish for engineers to convert heat loss from engine into power, but it is almost impossible in actual application. The serious problem in engine operation without cooling is that the cylinder material is sometimes melted by exceeding melting temperature. Following the first law of thermodynamics, it is possible that heat loss to cooling water can be converted into mechanical work through crankshaft. In this study, LHR(Low Heat Rejection) engine coated with zirconia and made by quartz was introduced as one of the promising engine and several useful qualitative and quantitative data were drawn.
Mixed Convection between Inclined Parallel Plates with different Temperatures
Piao, R.L. ; Kwon, O.B. ; Bae, D.S. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 33~39
Experiments are performed to study the mixed convection flow and heat transfer in an inclined parallel plates with the upper part cooled and the lower part heated uniformly. The Reynolds number ranges from
, the angle of inclination,
, from 0 to 45 degree from the horizontal line, and Pr of the high viscosity fluid is 909. In this paper, the PIV(Particle image velocimetry) with TLC(Thermo-sensitive liquid crystal) tracers is used for visualizing and analysis. This method allows simultaneous measurement of velocity and temperature field at a given instant of time. Quantitative data of the temperature and velocity are obtained by applying the color-image processing to a visualized image, and neural network is applied to the color-to-temperature calibration. This paper describes the methods, and presents the quantitative visualization of mixed convection. From this study, it is found that the flow pattern can be classified into three patterns which are affected by Reynolds number and the angle of inclination.
A numerical analysis for internal fluid flow of a PCV valve by using moving mesh
Lee, J.H. ; Choi, Y.H. ; Lee, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 40~44
A great deal of exhaust gas inside a combustion room goes out through exhaust pipe but residual gas, is called "Blowby gas", enters the crankcase through a small gap between the piston and the cylinder wall. Here, if the crankcase isn't vented, this causes many bad effects such as lubricant oil contamination, corrosion by that and crankcase explosion by rising pressure. So, most automobiles are constituted with a PCV (Positive Crankcase Ventilation) system to prevent previous problems. PCV valve is the most important part in this ventilation system. When companies are manufacturing new engines, engineers are designing it depending on their experiments than theoretical knowledge. Mush efforts and times are needed for new development. This study will show quantitative results to increase the possibilities of reduction of developing time.
Abnormal Vibration Diagnosis of High Pressure LNG Pump
Kim, H.E. ; Choi, B.K. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 45~49
Liquefied natural gas takes up six hundredths of the volume of natural gas, which makes storage and transportation much easier. To send out natural gas via a pipeline network across the nation, high-pressure LNG pumps supply highly compressed LNG to high-pressure vaporization facilities. The Number of high-pressure LNG pumps determined the send-out amount in LNG receiving terminal. So it is main equipment at LNG production process and should be maintained on best conditions. In this paper, to find out the cause of high beat vibration at cryogenic pumps, vibration and motor current signal analysis have been performed. High vibration of cryogenic pumps could be reduced due to the modification of motor rotor.
A Study on the Durability of Glass Fiber Reinforced Plastics Rebars
Moon, C.K. ; Kim, Y.H. ; Park, Y.H. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 50~56
The mechanical properties of glass fiber reinforced polymer reinforcing bars(rebar) in various environment conditions such as moisture, chloride, alkali and freeze-thaw actions at temperature ranging from room temperature(
) to high temperature of up to
have been studied. The test results indicated that tensile strength and interfacial shear strength of GFRP bar were decreased with the increasing of temperature and holding time of each environment condition. The degradation in alkali environment. was more serious than those in the other environments.
Friction and Wear Characteristics of Carbon Fiber Reinforced Composites against Lay-up Orientation
Koh, S.W. ; Choi, Y.K. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 57~64
This paper is the study on dry sliding wear behavior of carbon fiber reinforced epoxy matrix composites against lay-up orientation. Tests were investigated on the effect of the lay-up orientation, fiber sliding direction, load and sliding velocity when circumstance keep continuously at
, 60%RH. Pin-on-disk dry sliding wear tests for each experimental condition were carried out with a carbon fiber reinforced plastic pin on stainless steel disk in order to search the friction and wear characteristics. The wear rates and friction coefficients against the stainless steel counterpart were experimentally determined and the wear mechanisms were microscopically observed. The effect on friction and wear behavior are observed differently, according to various conditions. When sliding took place against counterpart, the highest wear resistance and the lowest friction coefficient were observed in the
lay-up orientation at anti-parallel direction.
Robust Sampled-Data Controller Design for a Flexible Beam
Choe, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 65~72
A new approach is presented to design a robust sampled-data controller for an experimental flexible beam carrying an unknown payload at its free end. The purpose of this paper is to move the free end of the beam to a desired position in the specified time under vibration suppression. We derive a transfer function nominal model for the beam and quantitative description of model uncertainties based on experimentally obtained frequency response data. Robust controllers are designed by applying the sampled-data
, in which two types of uncertainties, structured and unstructured uncertainties, are adopted for satisfactory performance in terms of hinge position regulation and vibration damping, besides obviously asymptotic stability. The effectiveness of the proposed method is confirmed through simulation and experimentation.
A Study on the Performance Test and Verification of Heat Transfer characteristics in Automobile Rear Window Heater
Juen, H.Y. ; Lee, C.K. ; Bae, H.J. ; Lee, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 73~80
Both theoretical and experimental investigations were conducted to analyze defrosting behavior of a window heater operating in the low outdoor temperature(
). To achieve this purpose, first a warm-chamber experiment(
) was performed to measure inner and outer surface temperature of the rear window(heated by the electric heater supplying 195 W) as functions of both time and position. Secondly, a cold chamber experiment was made to continuously record defrosting process of the frosted window. From the comparisons of the two experimental results, it was found that there was a similarity between the spatial distributions of both temperature and remaining frost. Thus, the temperature data from the warm-chamber experiments can be utilized to predict an expected zone covered with remaining frosts, and this approach can also be adopted in the inspection process in order to economically guarantee optimized performance of the window heater. Finally, an analytical model based on one-dimensional, steady-state heat transfer theories was proposed and successfully predicted the outer surface temperature of the rear window surrounded by cold air(
) for the given operating conditions(heater power, inside and outside heat transfer coefficients, and surrounding air temperature, etc.).
Numerical Analysis on the Increasing Temperature Characteristics of Vaporizer Fin for Liquefied Natural Gas with Super Low Temperature
Yi, C.S. ; Kong, T.W. ; Lee, H.D. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 81~87
This study is numerical analysis on the increasing temperature characteristics of vaporizer fin for liquefied natural gas with super low temperature. Existing LNG vaporizers use the direct contact heat transfer mode where the extreme super low temperature LNG of
flows inside of the tubes and about
air flows on outside of the fin. Recently, the vaporizers with great enhanced performance compared to conventional type have been developed to fulfill these requirements. The vaporizing characteristic of LNG vaporizer with air as heat source has a fixed iced. These characteristic cause a low efficiency in vaporizer, total plant cost and installing space can be increased. The vaporizing characteristics of LNG via heat exchanger with air are analytically studied for an air heating type vaporizer. This study is intended to supply the design data for the domestic fabrication of the thickness and angle vaporizer fin. Governing conservation equations for mass, momentum and energy are solved by STAR-CD based on an finite volume method and SIMPLE algorithm. Calculation parameter is fin thickness, setup angle and LNG temperature. If the vaporization performance of the early stage and late stage of operating is considered, the case of
was very suitable. In this paper was estimated that the heat transfer was most promoted in case of THF=2mm.
Thermal Performance Characteristics of Closed-Wet Cooling Tower
Sarker, M.M.A. ; Kim, E.P. ; Moon, C.G. ; Yoon, J.I. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 88~92
The experiment of thermal performance about closed-wet cooling tower was conducted in this study. A closed cooling tower is a device similar to a general cooling tower, but with cooling tower replaced by a heat exchanger. The test section for this experiment has the process that the cooling water flows from the top of the heat exchanger to the bottom side in the inner part of the tube, and spray water flows in the gravitational direction in the outer side. Air comes in direct contact with the spray water at the outer side of the tube while passing from the lower the upper part having a counterflow to the spray water. The heat transfer pipe used in this experiment is a bare-type tube having an outer diameter of 15.88mm. The heat exchanger is consisted of seven rows and fifteen columns. In this experiment, thermal performance of the cooling tower is derived from overall heat transfer coefficients between the process fluid and sprayed water and volumetric overall mass transfer coefficient between sprayed water and air.
Performance Characteristics of Small Sized Cross-flow Cooling Tower
Sarker, M.M.A. ; Kim, E.P. ; Kim, J.D. ; Jun, C.H. ; Moon, C.G. ; Yoon, J.I. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 93~98
The performance of cooling tower is dependent on the thermal performance of the packings. It's assessed by heat transfer rate and fan power. In this study, new packing was developed for application in compact type cross-flow cooling tower. The packing characteristic curve and the pressure drop curve were obtained by measuring packing characteristic values and pressure drops of small sized filler in comparison to existing mid-large sized filler. The heat transfer characteristics on small sized filler are about 66% higher than existing mid-large sized filler. The pressure drop characteristics on small sized filler are about two times of the pressure drop characteristics on existing mid-large sized filler.
Study on the Working Characteristics of Vaporizer for Super Low Temperature Liquefied Gas
Kong, T.W. ; Yi, S.B. ; Lee, S.C. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 99~105
LNG Vaporizers must be smaller, more efficient, and easier to operate and maintain. Recently, the vaporizers with greatly enhanced performance as compared to conventional type, have been developed to fulfill these requirements. The vaporizing characteristic of LNG vaporizer with air as heat source has fixed ice. These characteristic has efficient down and total plant cost and installing space can be increase. On that reasons must be optimize through tube and pipes analysis and experiments with enhanced type in this study. In this study performance to the workong characteristics for air heating type vaporizer for super low temperature liquefied gas.
Structural Design and Cost Evaluation of Double Hull Bulk Carrier
Song, H.C. ; Yum, J.S. ; Kim, B.I. ;
Journal of the Korea Society For Power System Engineering, volume 9, issue 2, 2005, Pages 106~111
After many casualties of conventional bulk carriers in recent years, a double hull bulk carrier was proposed to enhance the structural safety of a side shell and a transverse bulkhead. In this paper, two alternative structural designs of a double hull bulk carrier were carried out based on the Lloyd's rule. One has the double sided hull with longitudinal stiffeners and the other has that with a girder. The final structural design was examined in comparison with an existing single hull bulk carrier from the viewpoints of cargo hold capacity and the increases of weight and construction cost. Generally, the construction cost of a ship consists of the costs of material, labor and overhead cost. But, in this study, the relative construction cost concept was introduced to compare the economical validity more precisely. In this concept, fixed overhead cost is excluded in the assessment of construction cost, and only the variable overhead cost is added up to labor cost. As the result of this study, a double hull bulk carrier can be constructed within 1% increase of weight and construction cost.