Fundamental combustion experiment of single-point auto-ignition engine with pulsed supermulti-jets, single piston and rotary valve

A new compressive combustion principle due to colliding pulsed supermulti-jets has been proposed by us, which is expected to achieve high thermal efficiency over 50% and less combustion noise. This paper reports some combustion experiments for a new prototype engine based on this breakthrough principle, which has twenty-four intake nozzles for supermulti-jets (Tri-octagon). First, after a rotary valve induces twenty-four intake jet flows simultaneously at a negative pressure condition generated during the early expansion process of a single piston, collision of jet flows at the center of combustion chamber occurs, which results in high local compression ratio at the center and also single-point auto-ignition. Combustion experiments for this prototype engine at lean burning condition reliably show higher combustion pressure than flame propagation on chamber wall.