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Application of Large Eddy Simulation to Diesel Spray
Tsukasa Hori,Jiro Senda,Tanaka Hiroshi,Kyosuke Irie,Kazuya Machida,Yasuo Moriyoshi,Hajime Fujimoto 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The validation of an evaporative spray simulation with LES has been conducted using Rayleigh scattering method. Rayleigh scattering method is able to measure the instantaneous equivalence ratio on the spray cross section, assuming adiabatic mixture between ambient gas and fuel to estimate the mixture temperature. It is used to validate an evaporative spray simulation with LES. The results showed that the LES simulation was possible to reproduce the evaporative spray development in the quasi-steady condition, using the finer computational grid. In order to improve the computational accuracy, the radial development of the gas velocity from the spray upstream should be reproduced by the improvement of the computational scheme and the spray modeling.
New Concept on Low Emissions of Diesel Combustion
Hajime Fujimoto,Jiro Senda 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
The human healthy and the earth environment strongly demand a high-sped diesel engine to apply the severe regulation of its exhaust emissions now and near future. The conventional technique does not always suit the regulation, and all the people strongly need the new technique for it.<br/> This paper describes the new concept on the low emissions of diesel combustion. The concept is the usage of the fuel mixed with liquefied carbon dioxide. The experimental results show the good trends, that is, low NOx and low soot. Namely, the results are the evidence of the hopeful countermeasures for the future regulation when the concept applying to a diesel engine.<br/>
Potentiality of Oxygenated Fuels on Soot-Free Diesel Combustion
Takaaki Kitamura,Takayuki Ito,Jiro Senda,Hajime Fujimoto 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
Fuel/air equivalence ratio '??' and temperature 'T' have a significant effect on the quality of particulate formation. In other words, it is probable that smokeless diesel combustion is realized if ?? and T inside the burning plume could be controlled based on the dependence of those on soot formation. The purpose of this work is to extract smokeless ?? - T conditions for various kinds of fuels, including paraffinic hydrocarbon, aromatic hydrocarbon, and oxygenated hydrocarbon, and to discuss a possibility of smokeless diesel combustion avoiding a soot formation region on ?? - T diagram. Sooting ?? - T map, which shows the tendency to generate soot particles as a function of ?? and T, was made using a detailed soot formation model. The model was based on a combination of a detailed reaction mechanism to calculate the gas phase chemistry and a detailed kinetic soot model based on the method of moments. It was found that smokeless ?? - T condition becomes more widespread especially for oxygenated fuels, due to the notable reduc-tion of both acetylene and PAHs. As a result of this work, a new concept for diesel combustion has been developed that utilizes the smokeless nature of oxygenated fuels.