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Analysis of spatial vapor-phase distribution using the LIF method on multi-component fuel
윤준규,명광재,J. Senda,H. Fujimoto 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.9
We analyzed the vapor-phase distribution and behavior of each component in multi-component fuel (MCF). Evaporation characteristic of MCF was researched by laser-induced fluorescent (LIF) method. A pulsed Nd-YAG laser was used as incident light, and an experiment was performed in a constant-volume vessel so that optical measurement could be possible. MCF was injected through electronically controlled common rail injector into the vessel. I-octane (C8H18), n-dodecane (C12H26) and n-hexadecane (C16H34) were selected to be low boiling point (LO-B.P.), mid boiling point (MI-B.P.) and high boiling point (HI-B.P.) components, respectively, and Fuel A, Fuel B and Fuel C, made by compounding those components at different mass fractions, were used as MCF. Experimentation was performed under the conditions that injection pressures were 42MPa, 72MPa and 112MPa, respectively, ambient gas density was 15kg/m3 and ambient gas temperature was 700K. The spatial vapor-phase distribution, dispersion process of mixture, and vaporphase homogeneity were researched. It was ascertained that the vapor-phase of MCF showed stratified distribution and the dispersion of mixture was improved in proportion to the mass fraction of the LO-B.P. component.
Research of Atomization, Spray and its Combustion over 45 years
( H. Gen Fujimoto ),( J. Senda ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
The authors have been investigated the phenomena of atomization, spray and its combustion over 45 years, especially, those relating to a CI engine. This paper describes firstly the research of a diesel spray conducted by pioneers in 1920s and 1930s. The other topics are (1) atomization in electrostatic field, (2) diesel spray and (3) diesel combustion. Lastly, the author proposes the proposal to next coming researchers in the field of atomization spray and its combustion.
Research of PCCI Combustion in Doshisha University
H. Gen Fujimoto,J. Senda,Y. Wada 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
PCCI combustion is one of the means to meet with the future severe regulation of exhaust gas through a CI engine. The authors have carried out the experiments of the mixed fuel to realize PCCI combustion. The base of this kind of combustion is the flash boiling phenomena taking place in the mixed fuel. This report describes the summary of the experiments of the characteristics of spray and those of combustion of the mixed fuel and the application of flash boiling spray to a CI engine with a single cylinder conducted in Doshisha University.
Numerical Prediction of Cavitating Flow inside Nozzle Hole Based on Cavitation Bubble Dynamics
( Matsumoto M. ),( Kobashi Y. ),( Matsumura E. ),( Senda J. ),( Fujimoto H. ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
In direct injection engines, fuel spray atomization is very important factor for the formation of fuel/air mixture, which influences on the engine performance and exhaust emissions of engine out. Especially, cavitation bubbles breaking out inside the nozzle hole have the significant role for spray atomization process. The purpose of this research is to make the effect of the cavitation on the fuel spray atomization clearly. The numerical model based on the bubble dynamics was proposed in this report, where the behavior of cavitation bubbles is treated as a function of pressure inside the nozzle hole. The prediction of bubble behavior under various conditions in the case of a single bubble was carried out by use of pressure distributions estimated through the experimental results. Primary, the processes of bubble growth and its shrinkage were calculated for each test fuel at given injection pressure. Secondary, the behavior of cavitation bubble was simulated for various initial bubble radiuses. As results of these calculations, although the position of bubble collapsing inside the nozzle hole does not coincide with experimental results, this proposed model predicts quantitatively the temporal change in bubble radius for each case.