DME/Methane混合燃料を用いた過給HCCI燃焼特性に関する研究

抄録

An investigation was made of the fundamental combustion characteristics of a supercharged Homogenous Charge Compression Ignition (HCCI) engine operating on a gaseous fuel blend of dimethyl ether and methane. Besides measuring the in-cylinder pressure, spectroscopic techniques were used to measure light absorbance and light emission intensity. Exhaust gas samples were also analyzed with a Fourier transform infrared gas analyzer. The experimental results revealed that varying the input heat energy and the mixing ratios of the gaseous fuels caused the in-cylinder pressure to rise sharply, making stable engine operation difficult. However, it was found that applying supercharging while keeping the input heat energy constant moderated the pressure rise during combustion, though the in-cylinder pressure rose overall. As a result, that made it possible to avoid knocking and also to obtain cleaner exhaust emissions. Consequently, the results of this study demonstrate that applying supercharging according to the engine load is a key factor in controlling HCCI combustion.