Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of ILASS-Korea
Journal Basic Information
Journal DOI :
Institute for Liquid Atomization and Spray Systems-Korea
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Dec 2012
Volume 17, Issue 3 - Sep 2012
Volume 17, Issue 2 - Jun 2012
Volume 17, Issue 1 - Mar 2012
Selecting the target year
A Study of Injection and Combustion Characteristics on Gasoline Direct Injection in Constant Volume Chamber
Kim, Kyung-Bae ; Kang, Seok-Ho ; Park, Gi-Young ; Seo, Jun-Hyeop ; Lee, Young-Hoon ; Kim, Dae-Yeol ; Lee, Seong-Wock ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 113~120
DOI : 10.15435/JILASSKR.2012.17.3.113
It is being more serious problems that the pollutant and the greenhouse gas emitted from the internal combustion engines due to the increasing demand of automobiles. To counteract this, as one of the ways has been studied, GDI type engine, which is directly injected into the combustion chamber and burns by a spark ignition that chose the merits of both gasoline engine and diesel engine, was appeared. The combustion phenomena in this GDI engine is known to contribute to combustion stability, fuel consumption reduction and reductions of harmful substances of exhaust gas emission, when the fuel spray of atomization being favorable and the mixture formation being promoted. Accordingly, this study analyzed the affection of ambient temperature and fuel injection pressure to the fuel by investigate the visualization of combustion, combustion pressure and the characteristic of emission, by applying GDI system on the constant combustion chamber. As a result, as the fuel injection pressure increases, the fuel distribution in the combustion chamber becomes uniform due to the increase of penetration and atomization. And when ambient temperatures in the combustion chamber become increase, the fuel evaporation rate being high but the penetration was reduced due to the reduction of volume flux, and confirmed that the optimized fuel injection strategy is highly needed.
Experimental Study on Mixing Stability and Macroscopic Spray Characteristics of Diesel-gasoline Blended Fuels
Park, Sewon ; Park, Su Han ; Park, Sungwook ; Chon, Mun Soo ; Lee, Chang Sik ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 121~127
DOI : 10.15435/JILASSKR.2012.17.3.121
The study is to investigate the mixing stability, fuel properties, and macroscopic spray characteristics of diesel-gasoline blended fuels in a common-rail injection system of a diesel engine. The test fuels were mixed diesel with gasoline fuel, which were based volume fraction of gasoline from 0 to 100% in 20% intervals. In order to analyze the blended effect of gasoline to diesel fuel, the properties of test fuels such as density, viscosity, and surface tension were measured. In addition, the spray behavior characteristics were studied by investigating the spray tip penetration and spray angle using a spray images through a spray visualization system. It was revealed that the density, kinematic viscosity and surface tension of diesel-gasoline blending fuels were decreased with the increase of gasoline fuel. The injection quantity of test fuels were almost similar level at short energizing duration condition. On the other hand, the increase of energizing duration shows the decrease of injection quantity compared to short energizing duration. The test blending fuels have similar growth in Spray tip penetration and Spray cone angle.
Effect of Flame Spray Distance on Particle Behavior and Morphological Characteristics of
Lee, Jae Bin ; Shin, Dong Hwan ; Lee, Seong Hyuk ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 128~133
DOI : 10.15435/JILASSKR.2012.17.3.128
The present study aims to examine the influence of flame spray distance on the thermal behavior of micro-metal particles and the morphological characteristics of
layers coated on the preheated SCM415 substrates by using the conventional flame spray system. Commercially available nickel-based
particles with a mean diameter of
were used. In addition, CFD simulations using a commercial code (FLUENT ver. 6.3.26) were conducted to estimate temperature and velocity distributions of the continuous and discrete phases before impact on the substrate. From FE-SEM images of coated layers on the substrates, it was observed that as the spray distance decreased, the metal particle morphology showed splash-like patterns and such a short stretch shape, resulting from higher particle momentums and the impact of partially melted particles. Moreover, it was found that the spray distance should be considered as one of important parameters in controlling the porosity and the adhesion strength.
Comparison of Nano-particle Emission Characteristics in CI Engine with Various Biodiesel Blending Rates by using PPS System
Kwon, J.W. ; Kim, M.S. ; Chung, M.C. ; Lee, J.W. ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 134~139
DOI : 10.15435/JILASSKR.2012.17.3.134
The main purpose of this study is to analyze and compare the nano-particle emission characteristics by 3-different biodiesel blending rates in a CI engine. Nano-particle number density emitted from various operating conditions of compression ignition engine can be investigated by using the PPS (Pegasor Particle Sensor) system. Namely, some particle charged through the corona discharge in real-time can be measured by PPS system. Under the steady state operation of the 2.0L CRDi diesel engine with different operating condition and biodiesel blending rates, the nano-particle number density was analyzed at the downstream position of DOC system. As this research result, more engine load speed and higher the concentration of biodiesel blending rate showed that the nano-particle number density decreases. Also we found that DOC system for clean diesel engine is effectively useful instrument to reduce diesel particulate matter as resource of nano-particle generation.
Effects of Injector Design Parameter on Nozzle Coking in Diesel Engines
Kim, Yongrae ; Song, Hanho ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 140~145
DOI : 10.15435/JILASSKR.2012.17.3.140
Recent common-rail injector of a diesel engine needs more smaller nozzle hole to meet the stringent emission regulation. But, small nozzle hole diameter can cause nozzle coking which is occurred due to the deposits of post-combustion products. Nozzle coking has a negative effect on the performance of fuel injector because it obstructs the fuel flow inside a nozzle hole. In this study DFSS (Design for six sigma) method was applied to find the effect of nozzle design parameter on nozzle coking. Total 9 injector samples were chosen and tested at diesel engine. The results show that nozzle hole diameter and K-factor have more effect on nozzle coking than A-mass and hole length. Large hole diameter and A-mass, small hole length and K-factor give more positive performance on nozzle coking in these experimental conditions. But, a performance about nozzle coking and exhaust gas emission shows the opposite tendency. Further study is needed to find the relation between nozzle coking and emission characteristic for the optimization of injector nozzle design.
Particle Emission Characteristics of Heavy-duty Diesel Engine using Aftertreatment Systems
Kwon, Sangil ; Park, Yonghee ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 146~151
DOI : 10.15435/JILASSKR.2012.17.3.146
This study was primarily focused on the experimental comparison of the particle emission characteristics for heavy duty engine. PM and particle number from various heavy duty engines and DPF type were analyzed with a golden particle measurement system recommended by the Particle Measurement Program. And the repeatability and reproducibility between test mode was analyzed. This study was conducted for the experimental comparison on particulate emission characteristics between the European and World-Harmonized test cycles for a heavy-duty diesel engine. To verify the particulate mass and particle number concentrations from various operating modes, ETC/ESC and WHTC/WHSC, both of which will be enacted in Euro VI emission legislation, were evaluated. Real-time particle formation of the transient cycles ETC and WHTC were strongly correlated with engine operating conditions and after-treatment device temperature. A higher particle number concentration during the ESC mode was ascribed to passive DPF regeneration and the thermal release of low volatile particles at high exhaust temperature conditions.
The Effect on the Combustion and Emission Characteristics of HCNG Engine According to the High Purity Hydrogen Contents
Lee, Jong-Tae ; Lim, Yun-Sung ; Kim, Hyung-Jun ; Lee, Seong-Wook ; Lee, Jang-Hoon ; Kim, Jong-Geu ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 152~157
DOI : 10.15435/JILASSKR.2012.17.3.152
This investigation decribes the effect of the combustion and emission characteristics of HCNG engine according to the high purity hydrogen contents. The HCNG fuel was made by the mixture with a high purity hydrogen (
) and a natural gas. The test vehicle was applied to the bi-fuel (Gasoline and CNG) system and this system was modified from the fuel supply and fuel tank. In addition, the three premixed HCNG fuels with mixed rate of 10, 20 and 30% of hydrogen were used to maintain the safety. In order to analyze the combustion characteristics of HCNG and CNG, the fuel was injected in the combustor with constant volume. The exhaust emission from light duty vehicle with bi-fuel system was analyzed by a chassis dynamometer and emission analyzer. From these results, the reduction rate of NOx emission increased in the HCNG fuel and emission amount of THC and CO shows a similar level with CNG fuel. This study can be utilized the basic data for the development of a new business plans related with HCNG engines.
Spray Characteristics of Solenoid-driven and Piezo-driven Type Injectors for the Clean Diesel Engine Application
Chon, Mun Soo ;
Journal of ILASS-Korea, volume 17, issue 3, 2012, Pages 158~163
DOI : 10.15435/JILASSKR.2012.17.3.158
This paper presents spray characteristics of piezo-driven type common-rail injector and comparisons to those of solenoid-driven type. Experiments were conducted to measure spray penetraion and SMD distributions using a spray visualization system and PDPA (phase Doppler particle analyzer) system. Injection conditions including injection pressure and energizing durations were varied in order to analyzing effects of injection conditions on spray characteristics. Furthermore, ambient pressures were increased for keeping ambient gas density close to in-cylinder pressure of diesel engine. Results showed that injection delay of piezo-driven type injector was much shorter than those of solenoid driven type and exhibited enhanced atomization performances.