Abstract
The combustion chamber shape was optimized using three dimensional CFD simulations to reduce heat loss for a diesel engine with a high compression ratio. The resulting shallow dish-like combustion chamber showed potential for heat loss reduction with a better combustion state. In this optimized system, a portion of the fuel spray remained at the center of the combustion chamber because of wall impingement. The lower half of the fuel spray developed along the chamber wall. Furthermore, experiments using a single-cylinder engine were performed. The optimized chamber improved fuel consumption compared with its shallow dish-type counterpart. The thermal balance analysis revealed that heat loss from the cylinder decreased.
