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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
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 16, Issue 6 - Dec 2012
Volume 16, Issue 5 - Oct 2012
Volume 16, Issue 4 - Aug 2012
Volume 16, Issue 3 - Jun 2012
Volume 16, Issue 2 - Apr 2012
Volume 16, Issue 1 - Feb 2012
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Measurement of Soot and Temperature on Bio Diesel Flame by Two-Color Method
Kim, M.S. ; Kang, H.Y. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 5~11
DOI : 10.9726/kspse.2012.16.4.005
There were some papers for diesel engine performance tests using BDF, but few article deals with the temperature and soot concentration of Bio diesel flame. Since the flame temperature of diesel engines is so high and change rapidly, an optical method for measurement of flame temperature is known as the most effective one. The two-color method regarding the visible wavelength radiation for the soot particles in flame was applied on Bio diesel flame in order to measure flame temperature and soot concentration in a diesel engine. Photo detecting device was newly designed and employed TSL250R, photo-diode, to pick-up the light information emitted from the combustion flame. As a result, real flame temperature T, as a flame brightness temperature, through Ta1, Ta2, were obtained and finally the characteristics of KL value as a soot concentration reveal the difference of combustion information between diesel fuel, blending oil and Bio diesel fuel oil.
Calculation Effect of GPU Parallel Programing for Planar Multibody System Dynamics
Jun, C.W. ; Sohn, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 12~16
DOI : 10.9726/kspse.2012.16.4.012
In this paper, the equations of motions for planar multibody dynamics are established for considering the parallel programming based on GPU. Cartesian coordinates are used to formulate the equations of motion and implicit integration method called HHT-alpha is employed. Open chain multibody system is considered for computer simulation. CUDA toolkit is employed for establishing the GPU parallel programming. The exactness of the analysis is verified from the comparison with ADAMS. The results from parallel computing based on GPU are compared with the results from the sequential programming based on CPU in terms of calculation time. The multiple pendulum with bodies and joints is employed for the computer simulation. In the pendulum system that has 290 bodies, the parallel program indicates an improved efficiency of about 25.5 second(15.5% improvement). It is noted that the larger the size of system is, the time efficiency is better.
A Study on the Characteristic of Motion and Resistance Performance from the Body Plan of Planning Leisure boat at low speed
Park, C.H. ; An, N.H. ; Jang, H.Y. ; Kwon, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 17~23
DOI : 10.9726/kspse.2012.16.4.017
In this study, the numerical simulation and basin model test have been performed to evaluate sea worthiness and resistance performance for a small pre-planning three type of leisure boats which are U, V, Y shapes of hull forms. As a well known commercial CFD code, Maxsurf, was applied for modeling hull forms used as the solver of motion analysis. Also the model resistance test was carried out to estimate the effective power of boat in the basin tank. Numerical simulation and model test results show that Y-shaped hull is better than the other types in terms of heave and pitch motion, having a key effect on a boat sea worthiness. But V-type hull is more efficiency than others cases in resistance performance.
Numerical analysis of fluid flow and thermal fields in the vertical fluidized bed heat exchanger
Lee, B.C. ; Kang, H.K. ; Lee, M.S. ; Ahn, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 24~29
DOI : 10.9726/kspse.2012.16.4.024
The numerical analysis by using CFX 11.0 commercial code was done for prediction of fluid flow and thermal field in the vertical heat exchanger. The present experimental studies were also conducted to investigate the effects of circulating solid particles on the fluid flow and temperatures in the fluidized bed vertical shell and tube type heat exchanger with counterflow, at which the solid particles of glasses (3
) were used in the fluidized bed with a smooth tube. The effect of circulation on the distance(L) of tube inlet and baffle plate was also examined. The present experimental and numerical results showed that the particles in the distance (Ds) of 15 mm showed a more efficient circulation without stacked the space and the LMTD(Log Mean Temperature Difference) in the fluidized bed type was much lower than that in the typical type shell and tube heat exchanger.
Design of Scroll Expander for Electric Power Generation System using Organic Rankine Cycle with Biomass Energy Source
Moon, J.H. ; Yu, J.S. ; Kim, H.J. ; Cho, N.J. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 30~36
DOI : 10.9726/kspse.2012.16.4.030
A scroll expander has been designed to produce a shaft power from a R134a Rankine cycle for electricity generation. Heat was supplied to the Rankine cycle through a heat exchanger, which received heat from another cycle of water. In the water cycle, water was heated up in a boiler using biogenic solid fuel. The designed scroll expander was a horizontal type, and a trochoidal oil pump was employed for oil supply to bearings and Oldham-ring keys. For axial compliance, a back pressure chamber was created on the backside of the orbiting scroll base plate. Numerical study has been carried out to estimate the performance of the designed scroll expander. The expander was estimated to produce the shaft power of about 2.9 kW from a heat supply of 36 kW, when the temperature of R134a was
at the evaporator and condenser of the Rankine cycle, respectively. The expander efficiency was about 70.5%. When the amount of heat supply varied in the ranges of 7.5~55 kW, the expander efficiency changed in the range of 45.6~70.5%, showing a peak efficiency of 70.5% at the design shaft speed.
Forced convective Heat Transfer in rectangular channel
Lim, T.W. ; You, S.S. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 37~43
DOI : 10.9726/kspse.2012.16.4.037
This paper performed experimental research in order to measure boiling heat transfer coefficient of water in microchannel with hydraulic diameter of
. Tests were conducted within the ranges of heat fluxes from 100 to 400 kW/
, vapor qualities from 0 to 0.2, and mass fluxes of 200, 400, and 600 kg/
. From the experimental results, it was found that flow boiling heat transfer coefficient is not dependent on mass flux or vapor quality, but instead on heat flux to a certain degree. The measured data of heat transfer are compared to a few available correlations proposed for mini-channels. Among them, Sun and Mishima's correlation is found to predict the present data well, within the mean absolute error of 17.84%.
Numerical analysis of heat transfer and friction factors in a duct having circular perforated baffles
Oh, S.K. ; Ahn, S.W. ; Ary, Bachtiar Krishna Putra ; Bae, S.T. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 44~50
DOI : 10.9726/kspse.2012.16.4.044
The present numerical study was performed to determine how the two perforated baffles( Inclined angle=
; perforation diameter=2cm) placed at a rectangular duct affect heat transfer and associated friction factors. The parametric effects of perforated baffles(3, 6 and 12 holes) and flow Reynolds number ranging from 28,900 to 61,000 on the heated target surface are explored. As for the investigation of heat transfer behaviours on the local Nusselt number with two baffles placed at
of the edge baffles, it is evident that the average Nusselt number increases with increasing number of holes, but the friction factor decreases with an increase in the hole number placed at baffles. The numerical results by commercial code CFX 10.0 are confirmed with the experimental data.
Three-Dimensional Computational Flow Analysis of a Sirocco Fan for a Package Air Conditioner by LES
Kim, J.K. ; Oh, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 51~59
DOI : 10.9726/kspse.2012.16.4.051
The computational flow analysis using LES technique was carried out to investigate the flow characteristics of a sirocco fan under the maximum flowrate condition. The commercial SC/Tetra software was used for this unsteady and three-dimensional numerical analysis. In consequence, because a flow is unstable within the range of about 50% of a housing depth from a bellmouth around the cutoff region, the passing flow through the blade cascade occurred on the X-Y plane is a slow or a reverse with approaching to the housing inlet. Also, the secondary flow shows on the radial plane of a housing, and its vortex center exists within about 33% of a housing depth from a bellmouth except the cutoff region. Moreover, the flow occurring on the exit plane of a sirocco fan shows a complex secondary flow.
Effect of Reverse Transformation on the Damping Capacity of High Manganease Austenitic Stainless Steel
Kang, C.Y. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 60~65
DOI : 10.9726/kspse.2012.16.4.060
This study was carried out to investigate the effect of reverse transformation on the damping capacity in high manganese austenitic stainless steel.
-martensite was formed with the specific direction and surface relief by deformation. Over 95% of the austenite phase was transformed to deformation-induced
-martensite by 70% cold rolling. Reverse transformation became rapid above an annealing temperature of
, but there was no significant transformation above
. In addition, with increasing annealing time at
, reverse transformation was induced rapidly, but the transformation was almost completed at 10 min. Damping capacity was increased up to
, and than unchanged with the increasing annealing temperature. Damping capacity increased steeply with an increasing reverse treatment time up to 10min, whereas there were no significant change with a treatment time of more than 10 min. Damping capacity increased with an increasing the reversed austenite and was strongly affected by reversed austenite.
Influences of Post Weld Heat Treatment on Fatigue Crack Growth Behavior of Transverse TIG Welded Al6013-T4 Aluminum Alloy Joint
Haryadi, Gunawan Dwi ; Kim, Seon Jin ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 4, 2012, Pages 66~73
DOI : 10.9726/kspse.2012.16.4.066