RESEARCH
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Diesel engine (Group "NF")
The objective of this study is to apply neat biomass fuel to a DI diesel engine and investigate the effect of in-cylinder gas flow and combustion on the deposit formation and the fuel dilution in lubricating oil. The study focuses on the low load combustion and emissions considering that low load exhaust contain much unburned fuels and the unburned fuels are the source of the deposit formation and the fuel dilution.
Diesel Spray (Group "SPRAY" and "RCM")
We investigate the effects of flame development occuring in the combustion chamber on the heat release rate and soot emission using rapid compression machine, total gas sampling method, and high-speed 2-corlor thermometry system.
SGS combustion model (Group "LES")
We developed SGS combustion model based on assumed PDF method for large eddy simulations of turbulent non-premixed flames.
Fast calculation of mean reaction term using machine learning (Group "ML")
Integration of reaction rate appearing in mean reaction term needs a huge computational cost during large eddy simulations combined with assumed PDF method. In order to reduce the cost, a machine learning applys to the integration.
Injector capable of emulsifying biomass fuel without surfactants (Group "Emul")
In order to overcome some disadvantages of emulsified fuel combustion, including a high cost of surfactant for emulsification, and instability of fuel structure containing water, we are developing an internally rapid mixing type of injector, which generates emulsified fuel just before injection through rapid mixing of fuel with water in the injector. We are investigating the atomization characteristics of emulsified fuel droplets from the injector and the distribution of fuel and water inside emulsified fuel droplets.
High Temperature Air Combustion (Group "HiTAC")
To date, various combustion technologies based on dilution with burned gases have been developed to allow further reductions of NOx and soot emissions and to improve the thermal efficiency of furnace systems. These technologies are referred to as MILD combustion in Italy, flameless oxidation in Germany, and high temperature air combustion in Japan. In the present study, we focus on NOx emissions from furnaces applying high temperature air combustion (HiTAC) technology based on a regenerative burner system.
Turbulent lifted flames (Group "FLAME")
Lifted flames in combustion furnaces are diluted with burned gas entrained into the fuel jet. The reduced concentrations of reactants resulting from this dilution increase the liftoff height, while the associated temperature increase decreases the height. The aim of the present study was to develop a premixed model capable of predicting the variation in the liftoff height resulting from entrainment.
information
Power Engineering Laboratory
Energy System Dept.,
Tokushima University
Minamijosanjimacho 2-1
Tokushima 770-8506
JAPAN
TEL.081-88-6569563
FAX.081-88-6569124