Department of Mechanical and Aerospace Systems Engineering

Advanced Thermo-Fluid Dynamics Laboratory

Thermal Energy Conversion Engineering Division

Kosaka Lab.

Faculty and Staff

Hidenori KOSAKA	Susumu SATO	Mayumi HIROSE
Professor	Assistant Professor	Administrative Assistant
Ext. 2170	Ext. 2174	Ext. 2170
hkosaka@ec.ctrl.titech.ac.jp	sato@ec.ctrl.titech.ac.jp	hirose@ec.ctrl.titech.ac.jp
Profile

Laboratory Homepage  http://www.ec.ctrl.titech.ac.jp

Research

Keywords : Internal Combustion Engine, Combustion Engineering, Laser Diagnostics, Thermo-Fluid Dynamics

Research Topics

Laser Diagnostics of Combustion in Diesel Engines

In the development of the latest engine systems to meet ever stringent regulations of particulate emission, it is becoming essential to combine various after-treatment technologies and advanced combustion control. The development of effective technologies requires a better physical and chemical understanding of the soot formation processes in the engines, for which comprehensive experimental investigation is inevitable. In order to investigate the soot formation process in a diesel spray flame, our research group has recently conducted simultaneous imaging of soot precursor and soot particles in a transient spray flame by laser-induced fluorescence (LIF) and by laser-induced incandescence (LII) techniques. The experimental results showed that the LIF from soot precursor (blue in the pic) was mainly located in the central region of the spray flame and the LII from soot particles (red in the pic) was observed to surround the soot precursor LIF region and to extend downstream. An advanced LIF spectral analysis in order to investigate the detail of the soot precursors is in progress.  (SAE Paper No.2002-01-2669, 2002)

　

Heat Loss in Diesel Engines

　

In order to further improve the thermal efficiency of direct injection diesel engines, better understanding on heat transfer phenomena in combustion chamber including interaction between combustion and gas flow is essential.  In order to investigate the heat transfer phenomena in diesel engines, we have been working on temperature and heat flux measurements on diesel combustion chamber wall using high-response thin-film thermo-couples and laser-induced phosphorescence thermometry techniques.

Feed-back Control of Diesel Combustion

Advanced feed-back control of diesel engines is considered to have a significant potential in the reduction of pollutant emission and noise and improvement of fuel economy. In order to investigate the potential of the feed-back control, we have developed a PC-based feed-back control system of a single cylinder common-rail direct injection diesel engine and demonstrated real-time control of combustion timing (CA50) via PI control of fuel injection timing and real-time control of engine power (IMEP) via PI control of fuel injection duration as shown in the figure below. As a next step, development and integration of smoke and NOx sensors are under progress.

Effect of Ambient Gas Heterogeneity on Diesel Combustion (Under Construction)

Abrasion and Lubrication of Diesel Fuel Injector (Under Construction)