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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of ILASS-Korea
Journal Basic Information
Journal DOI :
Institute for Liquid Atomization and Spray Systems-Korea
Editor in Chief :
Volume & Issues
Volume 7, Issue 4 - Dec 2002
Volume 7, Issue 3 - Sep 2002
Volume 7, Issue 2 - Jun 2002
Volume 7, Issue 1 - Mar 2002
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Numerical and Experimental Study on Spray Atomization Characteristics of GDI Injector
Lee, C.S. ; Rhyu, Y. ; Kim, H.J. ; Park, S.W. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 1~6
In this study numerical and experimental study on the spray atomization characteristics of a GDI injector is performed. To carry out numerical analysis, four hybrid models that are composed of conical sheet disintegration model, LISA model, DDB model, and RT model are used. The experimental results to evaluate the prediction accuracy of hybrid models are obtained by using phase Doppler particle analyzer and spray visualization system. It is shown that the prediction accuracy of hybrid model concerning spray developing process and spray tip penetration is good for all hybrid models, but the hybrid breakup models show different prediction of accuracy in the case of local radial SMD distribution.
Comparison of the Combustion Characteristics of Methane-Air and Gasoline-Air Mixtures
Park, M.H. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 7~11
Comparison of the combustion characteristics of methane-air and gasoline-air mixtures has been conducted experimentally by a spherical bomb technique. The results indicate 1) the burning velocity of gasoline is slightly higher than that of methane, but their basic behavior of combustion characteristics, positive dependence on temperature and negative one on pressure, are the same, and 2) 20 vol.% addition of hydrogen to methane enhances the burning velocity by about 30%, but does not come to reverse the tendency of pressure dependence to that of pure hydrogen.
Characteristics of the Spray and Combustion in the Liquid Jet
Youn, H.J. ; Lee, G.S. ; Lee, C.W. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 12~17
In this paper, spray and combustion characteristics of a liquid-fueled ramjet engine were experimentally investigated. The spray penetrations were measured to clarify the spray characteristics of a liguid jet injected transversely into the subsonic vitiated airstream, which is maintained a high velocity and temperature. The spray penetrations are increased with decreasing airstream velocity, increasing airstream temperature, and increasing air-fuel momentum ratio. To compensate our results of penetrations, the new experimental equation were modified from Inamura's equation. In the case of insufficient penetration, the combustion phenomenon in ram-combustor were unstable. Therefore, the temperature distribution was slanted to the low wall of the ram-combustor. These trends gradually disappeared as the length and air temperature of the combustor became longer. Combustion efficiency increased when the length of the combustor was long and the air temperature was high. Especially, stable flame region is enlarged when the length of the combustor was long and the air temperature was high. Type Abstract here. Type Abstract here.
A Study on the Characteristics of an Evaporating Diesel Spary Using LIEF Technique
Kim, Y.R. ; Kim, M.S. ; Cho, H. ; Min, K.D. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 18~23
An evaporating diesel spray of a common rail lnjector was visualized by LIEF technique. This technique makes it possible to separate the vapor and liquid phase images. The experiment was conducted in a constant volume vessel to make a high temperature and high pressure condition. Three images(vapor and liquid phase images from LIEF and a liquid phase image from Mie scattering) were taken simultaneously in one spray event. The major experimental parameters are the injection pressure and the ambient gas pressure. Also, a relative SMD distribution in a liquid phase was obtained by the ratio of the intensities of the fluorescence and the Mie scattering. The results show that the injection pressure and the ambient gas pressure have a close relation with the spray development and air-fuel muting process.
Study on Measurement Errors due to Attenuation in Plannar Image technique
Jeon, J.Y. ; Kim, D.J. ; Koh, H.S. ; Yoon, Y.B. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 24~30
In the analysis of the mass distribution and SMD(Sauter Mean Diameter), planar laser imaging technique is a convenient and useful one when compared to the mechanical pattemator or PDPA (Phase Doppler Particle Analyzer). But recorded signals at cameras and intensity of laser are distorted by attenuation. Using experimental datum and assumptions, we study measurement errors due to attenuation in plannar image technique.
An Combustion Diagnosis Using Optical Measurement in D. I Diesel Engine with Dual Fuel Stratified Injection System
An, H.C. ; Kang, B.M. ; Yeom, J.K. ; Chung, S.S. ; Ha, J.Y. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 31~37
In previous study, diesel-methanol stratified injection system is manufactured and applied to a D.I. diesel engine in order to realize combustion improvement using methanol, which is oxygenated fuel with large latent heat. We know that NOx and soot is reduced by stratified injection of diesel fuel-methanol. Therefore, in the present study, combustion diagnosis using optical measurement is tried to make clear effect of methanol on simultaneous reduction of NOx and soot. Two-color method is used to measure flame temperature and KL value, which is approximately proportional to the soot consentration along the optical path. Laser induced scattering method was used to measure distribution of soot at two dimensional area. Also, it is compared exhaust characteristics of NOx and soot with results of optical measurement.
The Effect of Property of Emulsified Fuel and Injection Pressure on the Spray Characteristics for Super-Critical-Pressure Burner
Lee, I.S. ; Jung, J.W. ; Cha, K.J. ; Kim, D.J. ;
Journal of ILASS-Korea, volume 7, issue 3, 2002, Pages 38~44
The purpose of this study is to investigate the effect of the volume fraction of water and injection pressure on the spray characteristics of water/oil emulsified fuel injected from the pressure swirl atomizer. The mixture of light oil and water by using impeller mixer was performed. The spray characteristics such as SMD and velocity were measured using PDPA. The injection pressures were 7.5, 100, 200 and
and volume fractions of water in emulsified fuel were 0, 10, 20 and 30%, respectively. The measurement sections were at 30, 60 and 90mm from injection nozzle tip. SMD and velocity of emulsified fuel were larger gradually by increasing the volume fraction of water in emulsified fuel. The spray angle was decreased and axial velocity was increased with increase in water content. It was found that the relative SMD ratio was increased more greatly than the relative axial velocity ratio in super critical pressure. The relative SMD ratio was increased and the relative axial velocity ratio was decreased with increase injection pressure at spray downstream.