Heat Loss Analysis for Various Piston Geometries in a Heavy-Duty Methanol PPC Engine.
Partially premixed combustion (PPC) in internal combustion engine as a low temperature combustion strategy has shown great potential to achieve high thermodynamic efficiency. Methanol due to its unique properties is considered as a preferable PPC engine fuel. Methanol injection has a longer penetration length than gasoline fuel under the same operation condition, and as such typical injection timing and piston bowl geometry optimised for gasoline PPC engine is not suitable for methanol PPC engine. In this study a baseline methanol PPC experimental engine is consider with a single injection of methanol at close to TDC condition. CFD simulation is performed to simulate the baseline case and satisfactory results are obtained in terms of combustion phasing, incylinder pressure and heat release rate.