Hideo Kawamura

Improvement of diesel engine startability by ceramic glow plug start system

Amelioration du demarrage des moteurs diesel grâce a un systeme avec bougie a incandescence en ceramique

Development of an Adiabatic Engine Installed Energy Recover Turbines and Converters of CNG Fuel

In order to improve the fuel consumption and control exhaust emissions in a heat insulation engine, fuels reformed CH 4 by CO 2 and steam were used. Porous metal plate coated Li 2 ZrO 3 was used to make CO 2 separate fromthe exhaust gas of the engine. CH 4 and CO 2 gas are supplied to the catalytic converter and reformed CO and H 2 gas increased to 30% on kinetic energy are supplied to the engine as well as gas and steam turbine is installed to recover the exhaust gas energy. As the result the thermal efficiency of the engine systems will be improved to about 57.5% compared with 42% of conventional diesel engine.

Change of Fracture Toughness and Strength Caused by Thermal Shock for Si3N4 with Microcrack

The effect of thermal shock on mechanical strength and fracture toughness was investigated for Si3N4 with controlled flaw. 3 types of Si3N4 with different grain size, which were sintered under different conditions, were tested. Thermal shock was predicted to occur by quenching after heating those samples up to 522–722°C in air. After thermal shock was given, the strength and fracture toughness increased compared with that of as-flawed samples, the thickness of microcrack seen on the surface was reduced, and the residual stress of the area surrounding microcrack changed to compression from tension. It was assumed that the compressive residual stress, presumably acting perpendicular to the direction of crack propagation, revealed the increase of the surface energy, which in turn increased the fracture toughness and strength.