Numerical simulation on lean-burn characteristics of a naturally aspirated opposed rotary piston engine fuelled with hydrogen at wide open throttle conditions

Opposed rotary piston engines are characterized by high power density, which makes them as an ideal source for hybrid vehicles and range extended electric vehicles. Hydrogen applications can fully exhibit the merits of opposed engines, achieve zero carbon dioxide emissions; however, seriously worsen nitrogen oxides emissions. In this investigation, lean-burn was adopted to low emissions using a three dimensional numerical simulation approach. The results indicated that engine speed 3000 r/min presented highest in-cylinder pressure during combustion among given scenarios, over depended more on equivalence ratio than 1000 2000 r/min. Heat release rates were very sensitive ratio. Combustion duration 0.8 shortest cases; it decreased with loss through cylinder walls increased significantly speed, meanwhile they dependent higher speed. Maximum monoxide formation occurred slightly earlier those Equivalence showed thermal efficiency corresponding emission factors quite 0.7