Numerical Analysis of Premixed Diesel Combustion with Variable Valve Timing 18ICES/085
Authors
Yutaka Murata - Waseda University
Daisuke Kawano - National Traffic Safety and Environment Laboratory
Jin Kusaka - Waseda University
Yasuhiro Daisho - Waseda University
Hisakazu Suzuki - National Traffic Safety and Environment Laboratory
Hajime Ishii - National Traffic Safety and Environment Laboratory
Yuichi Goto - National Traffic Safety and Environment Laboratory
Matsuo Odaka - Waseda University
Abstract
A variable valve timing (VVT) mechanism was applied to control premixed diesel combustion at higher load for low emissions and high thermal efficiency in a light duty diesel engine. By means of late intake valve closing, compressed charge temperatures near the top dead center were lowered, thereby increasing ignition delay to enhance fuel-air mixing. The variability of effective compression ratio has significant potential for ignition timing control. The VVT mechanism combined with EGR and supercharging systems simultaneously reduced NOx and smoke. The NOx and smoke suppression mechanism in the premixed diesel combustion was analyzed using the 3D-CFD code combined with detailed chemistry.