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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 4, Issue 4 - Nov 2000
Volume 4, Issue 3 - Aug 2000
Volume 4, Issue 2 - May 2000
Volume 4, Issue 1 - Feb 2000
Selecting the target year
Nondestructive Evaluation on Safety Assurance of Structures and Defects - Effectivity and Goal of NDE, Defects of Material -
Nam, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 5~12
A Study on the Heat Transfer Reduction due to the Clinker in the Thermal Poorer Plant
Kang, H.C. ; Lee, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 13~19
This study was conducted for the heat transfer reduction due to the clinker formed in the furnace of the thermal power plant. The thermal properties of clinker such as thermal conductivity, specific heat, density and void fraction were measured. The thermal conductivities of the clinker were ranged
and the average specific heat and the void fraction were
and 0.36 respectively. The thermal resistance of clinker was the greatest among the thermal resistances. It was found that the clinker reduces more than 90% of the heat transfer if the clinker is thicker than 10 cm.
Characteristics Measurement of Pneumatic Elements Using Isothermal Chamber
Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 20~25
In this study, methods for the characteristics measurement of pneumatic elements using isothermal chamber, the methods for the flow rate and dynamic characteristic measurement of pneumatic control valve, are proposed. An isothermal chamber is a chamber in which the steel wool is stuffed and isothermal condition can almost be realized. Therefore, the instantaneous flow rate could be measured only from the pressure response using the state equation of gas. Effectiveness and simplicity of the proposed method are confirmed by comparing the measured results obtained by proposed methods with the methods defined JIS and the ISO standards.
A Study on the Heat Transfer Performance Using Various Grooved Heat Transfer Tubes
Han, K.I. ; Chung, W.K. ; Ye, S.S. ; Park, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 26~32
Single-phase heat transfer performance and pressure drop for internally grooved tubes with angles were studied. Experiments were carried out in a counter flow heat exchanger with water as a working fluid. Two commercially available internally grooved tubes and smooth tube were tested. The internal diameter of the smooth tube was 16.5mm and the internal diameters of grooved tubes were 15.4mm, 14.9mm, 15.0mm, 16.7mm, respectively. Grooved angles in the tubes were
, respectively. An experimental device to measure the friction factor and heat transfer coefficient was constructed. The experimental results were obtained for the fully developed turbulent flow of water in tube on the condition of uniform heat flux. As the increase of flow rate, Reynolds number, numbers of groove and grooved angle led to the increase of pressure drop. Also this paper showed that heat transfer rate increased with increasing numbers of groove and grooved angle. An empirical relation taken from this study represented most of the data within
A Study on the Characteristics of Jet Pump Having Exteriorly Connected Multi-nozzles
Kim, M.K. ; Kwon, O.B. ; Kim, H.G. ; Lee, C.G. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 33~38
The characteristics of center-driver jet pump which have multi-nozzle were studied in this research. Jet nozzles are connected outside of the bend rather than inserted in the bend in order to transport solid materials or fish without any harm. Jet pumps having one nozzle, two nozzles, four nozzles, and sixteen nozzles were tested in this study. The efficiencies and performances of jet pumps were studied for several nozzles shape, for three different mixing chamber shapes, for two suction area shapes. All the efficiency curves for these cases are presented in this paper.
A Study on the Characteristics of Flame Structure in Coaxial Diffusion Combustor With Swirl
Kim, K.S. ; Lee, W.S. ; Kang, I.G. ; Lee, D.H. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 39~44
The purpose of this study is to investigate the flame structure and combustion characteristics in the model gas turbine combustor changing equivalence ratio. For this purpose, temperature and ion current were measured and these data were analyzed by the PDF and power spectra technique. We found that the flame length is longer while increasing the equivalence ratio in experimental condition, and especially
, combustion reaction was active by the stable swirl flow. and these flames were governed by the random three dimensional eddy.
Contactless DC Circuit Breakers Using MOS-controlled Thyristors
Sim, D.Y. ; Kim, C.D. ; Nho, E.C. ; Kim, I.D. ; Kim, Y.H. ; Jang, Y.S. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 45~50
Circuit breakers have traditionally employed mechanical methods to interrupt excessive currents. According to power semiconductor technology advances in power electronic device, some mechanical breakers are replaced with solid state equivalents. Advantages of the contactors using semiconductor devices include faster fault interrupting, fault current limiting, no arc to contain or extinguish and intelligent power control, and high reliability. This paper describes the design of a static
and 0 to 50A DC self-protected contactor with 85A "magnetic tripping" and 100A interruption current at
short circuit of load condition using a new power device the HARRIS MCT (600V-75A). The self-protection circuit of this system is designed by the classical ZnO varistor for energy absorption and turn-off snubber circuit ("C" or "RCD") of the MCT.
Dynamic Behaviour Analysis of a Hydraulic Control System for Vehicle Active Suspension
Jung, Y.G. ; Lee, I.Y. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 51~59
Active suspension systems have been using for improving ride quality and stability for vehicles. An active suspension system is composed of a hydraulic pump, pressure control valves, hydraulic dampers, vehicle body, tires and other components. In this study, the mathematical model for the active suspension system based on the quarter car concept is derived, and a program for analysing the dynamic behaviour of the suspension system is developed. The computed results by the developed program are compared with the experimental results for confirming the reliability and usefulness of the developed program.
Vibration Analysis of Geared Rotor System
Kim, K.D. ; Kim, Y.H. ; Yang, B.S. ; Lee, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 60~67
As the speed of rotating machines increases and also their weight decreases, the coupling between lateral and torsional vibrations must be considered. In the past, rotordynamics and geardynamics have tended to treat the lateral and torsional vibrations of the system elements as separate and decoupled mechanisms. In the paper, the coupled lateral-torsional free and forced vibration of rotors trained by gears is analyzed using finite element method. Also the complicated variation of the meshing stiffness as a function of contact point along the line of action is estimated correctly. The gear mesh model is assumed to be linear with constant average mesh stiffness.
A Study on the Use of Hierarchical Elements
Kim, J.W. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 68~73
A mixed degree finite element solutions using hierarchical elements are investigated for convergences on a 2-D simple cases. Elements are generated block by block and each block is assigned an arbitrary solution degree. The numerical study showed that a well constructed blocks can increase the convergence and accuracy of finite element solutions. Also, it has been found that for higher order elements, the convergence trends can be deteriorated for smaller mesh sizes. A procedure for a variable fixed boundary condition has been included.
Effect of Ni on the High Strength Characteristic of 9Cr Ferritic Heat Resistant Steel Applied to the Power Plants
Kang, C.Y. ; Miyahara, K. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 74~80
This present study was investigated effect of Ni contents on the high temperature strength characteristic in 9Cr ferritic heat-resistant steel added 1.7%W in place of Mo in order to restraint laves phase formation. Precipitation amount of carbide, number of particle per unit area and particle size of carbide were decreased with increase of Ni content. In the steels, carbides of
type was mainly precipitated, but laves phases could not precipitated. Tensile and yield strength, creep strength and creep rupture time was decreased, but elongation were increased due to decreasing of particle number per unite area and carbide amount precipitated with increase of Ni content.
A Study of Fatigue Crack Threshold Characteristics in Pressure Vessel Steel at Low Temperature
Park, K.D. ; Ro, T.Y. ; Kim, Y.T. ; Kim, H.J. ; Oh, M.S. ; Lee, K.L. ; Kim, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 1, 2000, Pages 81~87
In this study, CT specimens were prepared from ASTM SA516 Gr. 70 which was used for pressure vessel plates for room and low temperature service. And we got the following characteristics from fatigue crack growth test carried out in the environment of room and low temperature at
and in the range of stress ratio of 0.05 by means of opening mode displacement. At the constant stress ratio, the threshold stress intensity factor range
in the early stage of fatigue crack growth (Region I) and stress intensity factor range
in the stable of fatigue crack growth (Region II) was increased in proportion to descend temperature. It assumed that the fatigue resistance characteristics and fracture strength at low temperature is considerable higher than that of room temperature in the early stage and stable of fatigue crack growth region. The straight line slope relation of logarithm
in Region II, that is, the fatigue crack growth exponent m increased with descending temperature at the constant stress ratio. It assumed that the fatigue crack growth rate
is rapid in proportion to descend temperature in Region II and the cryogenic-brittleness greatly affect a material with decreasing temperature.