Power Engineering Laboratory of Tokushima University
History of our laboratory dates back to 1987 when Prof. K. Miwa joined to the Tokushima University after working for more than 17 years at Internal Combustion Engine laboratory of Kyoto University with Prof. Nagao and Prof. Ikegami. Dr. KIDOGUCHI has joined to the staff members since 1997, and Dr. Nada also has joined since 2011. Every academic year, around 21 people including BSc, MSc and PhD students are involved with experimental and theoretical research mostly concentrated on Diesel engines.
Our research at PEL.Tokushima covers most of phenomena taking place in the diesel combustion process. It starts with investigation of the diesel spray atomization,impingement,evaporation and the fuel-air mixing and then goes to some work on thermal decomposition and oxidation of liquid fuels, and NO destruction with HC.
Some students are also working on the mechanism of diesel spray ignition and combustion using a free piston Rapid Compression Machine (RCM) with a total gas sampling system to trace the composition of gas ( Soot, NOx, HCs...) during the ignition and combustion. In addition, we can measure temporal variation of temperature distribution in the combustion chamber of RCM by using a high-speed 2-color thermometry system.
Finally we operate a high speed DI Diesel engine to investigate the effect of the combustion chamber geometry, fuel property, injection pressure and EGR upon engine performance and exhausted emissions such as NOx and PM. We also observe the combustion process inside the engine cylinder using endoscopic high-speed photography. We have developed some other optical measurement system shown in research facility.
Here some people are involved with computational work on Diesel engine using Computational Fluid Dynamics (CFD) to predict the three dimensional gas flow and combustion inside the engine using a commercial CFD software of FLUENT.
Recently, we begin to work on development of combustion technology simultaneously reducing NOx and PM emissions for furnace combustion occurring in boilers and heating furnaces. A research group is developing a fuel injector allowing simultaneous injection of fuel, water, and atomizing air, and then obtaining emulsified fuel without any surfactants. In addition, we are investigating combustion characteristics of flames highly diluted with burned gas, called HiTAC and MILD combustion. Moreover, we are modeling correlations between liftoff heights and fuel velocities obtained from turbulent lifted flames diluted with recirculated burned gas.