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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
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An Investigation on a Spray Characteristics of Oxygenated Fuel with a Piezo Injector Common Rail System
Lee, Sejun ; Yang, Jiwong ; Kim, Sangill ; Lim, Ocktaeck ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 171~177
DOI : 10.15435/JILASSKR.2012.17.4.171
To understand oxygenated fuel characteristics including spray penetration length and spray angle at a real engine ambient pressure condition, DME was injected into a high pressure chamber by a piezo injector common rail system. The piezo injector common rail system was able to apply steady injection pressure, rapid response, and accurate injection quantity. Injection and ambient pressure were varied to confirm a relation with spray form. Using a direct photographing technique, development process of DME spray was captured. DME injection quantity was enlarged linearly as increasing of the injection pressure. In the high pressure chamber, when the injection pressure was enlarged the penetration length and velocity were increased due to a big momentum of fuel particle at the same ambient pressure. When ambient pressure was increased, the DME spray penetration length and velocity were decreased since the high ambient density of nitrogen was acted as a resistance. Although the ambient pressure and injection pressure were varied, each case of spray angle was almost same since the spray angle had a connection of the injector nozzle geometry.
An Investigation on the Spray Characteristics of Diesel-DME Blended Fuel with Variation of Ambient Pressure in the Constant Volume Combustion Chamber
Yang, Jiwoong ; Lee, Sejun ; Lim, Ocktaeck ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 178~184
DOI : 10.15435/JILASSKR.2012.17.4.178
The aim of this study was to compare the spray characteristics of a typical fuel (100% diesel, DME) and diesel-DME blended fuel in a constant volume combustion chamber (CVCC). The typical fuel (100% diesel, DME) and diesel-DME blended fuel spray characteristics were investigated at various ambient pressures (pressurized nitrogen) and fuel injection pressures using a common rail fuel injection system when the fuel mixture ratio was varied. The fuel injection quantity and spray characteristics were measured including spray shape, penetration length, and spray angle. Common types of injectors were used.
Comparison on Nano-particle Number Measurement Characteristics for Different Particle Generators between Spray type and Soot Type
Kim, M.S. ; Kwon, J.W. ; Chung, M.C. ; Lee, J.W. ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 185~191
DOI : 10.15435/JILASSKR.2012.17.4.185
Particulate matters (PM) that is generated by most diesel engine is regulated by the mass concentration measured by the conventional method it had been. Recently, Europe PMP (Particle Measurement Program) decided to start the regulation of vehicle's nano-sized particle number (PN) from the year of 2011 because of nano-particle's higher degree of harm to the human body. So firstly, the standard level of PN emission is introduced in the Euro 5/6 emissions regulation with a limit of
per km for light duty vehicle. Also KPMP(Korea Particle Measurement Program) was organized to copy quickly international technical trend. In this paper, it was investigated the nano-sized PN measurement characteristics for different particle generators between spray type and soot type. And the difference ratio between particle generators, the characteristic of PN concentration, counting efficiency and linearity was analyzed. Then, we make conclusions as followed. When particle diameter is increased, counting efficiency of two generators is decreased. Also Secondary calibration method is more higher 3% than Primary calibration method. Finally, SOF which is included in soot particles is not totally removed so it have great influence on test result of counting efficiency and linearity.
Breakup Characteristics of Fuel Droplet Including Nanoparticles
Lee, Jae Bin ; Shin, Dong Hwan ; Lee, Min Jung ; Kim, Namil ; Lee, Seong Hyuk ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 192~196
DOI : 10.15435/JILASSKR.2012.17.4.192
This paper reports on breakup characteristics of fuel droplet which includes metal nanoparticles. In order to develop a new injection system for nanoparticle-coated layers overcoming the conventional flame spray system, fundamental experiments were conducted to examine the interaction between a fuel droplet with nanoparticles and the external energy induced by the laser. In the experiments, this study used nickel nanoparticles whose size was under 100 nm to mix with kerosene as the fuel, and utilized a syringe pump and a metal needle to inject a fuel droplet. In particular, the Nd-YAG laser was adopted to give additional energy to the nanoparticles for evaporation of a fuel droplet containing nanoparticles. When the laser energy as 96 mJ was irradiated during the injection, it was observed that such an explosive evaporation occurred to break up a fuel droplet including nanoparticles, making the rapid increase in the ratio surface area to liquid volume. From this work, we suggest the possibility that the laser energy can be used for rapid evaporation of a fuel droplet.
Performance and Emission Studies in a DI Diesel Engine Using Wood Pyrolysis Oil-Bio Diesel Emulsion
Lee, Seokhwan ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 197~204
DOI : 10.15435/JILASSKR.2012.17.4.197
The vast stores of biomass available in the worldwide have the potential to displace significant amounts of fuels that are currently derived from petroleum sources. Fast pyrolysis of biomass is one of possible paths by which we can convert biomass to higher value products. The wood pyrolysis oil (WPO), also known as the bio crude oil (BCO), has been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of WPO in a diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the WPO. One of the easiest way to adopt WPO to diesel engine without modifications is emulsification of WPO with diesel or bio diesel. In this study, a DI diesel engine operated with diesel, bio diesel (BD), WPO/BD emulsion was experimentally investigated. Performance and gaseous & particle emission characteristics of a diesel engine fuelled by WPO/BD emulsion were examined. Results showed that stable engine operation was possible with emulsion and engine output power was comparable to diesel and bio diesel operation.
Comparisons of Diesel and DME Fuel in Macroscopic Spray Characteristics
Park, Junkyu ; Chon, Munsoo ; Park, Sungwook ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 205~209
DOI : 10.15435/JILASSKR.2012.17.4.205
This study focused on comparing macroscopic characteristics of DME and diesel fuel experimentally. DME fuel is one of the most promising alternative fuels because of its superiority in atomization characteristic and clearness in terms of exhaust gas compared with existing fossil fuels. In addition, DME fuel has high cetane number so it could be applied to compression ignition engine. However because DME fuel exists in gas phase at room temperature and atmospheric pressure, and it corrodes rubber parts of fuel line, DME fuel is hard to apply to commercial vehicles. To establish knowledge about DME fuel and furthermore, to develop commercial DME vehicles such as passenger cars, many research have been proceeded steadily. The present study, by comparing spray characteristics of DME fuel to those of diesel fuel, improved atomization characteristics in DME were revealed. Injection quantity measurement and spray visualization experiment were progressed and it was revealed that DME fuel shows small injection quantity than that of diesel fuel and axial development of spray in terms of spray tip penetration decreases when DME fuel was injected.
Effect of Nozzle Hole Number on Fuel Spray and Emission Characteristics of High Pressure Diesel Injector
Chon, Mun Soo ;
Journal of ILASS-Korea, volume 17, issue 4, 2012, Pages 210~215
DOI : 10.15435/JILASSKR.2012.17.4.210
This paper This paper presents effect of nozzle hole number on spray characteristics and engine performance. Experiments were conducted to measure spray penetration and SMD distributions using a spray visualization system and PDPA (phase Doppler particle analyzer) system. In addition, engine performance and emission characteristics were measured using a single cylinder engine and emssion measurement systems. Results showed that 8-hole-injector exhibits improved spray performances. Furthermore, soot emission was decreased with 8-hole-injector, compared to that of 6-hole-injector.