Thermal analysis of a poppet valve gasoline engine for two- and four-stroke operation

Abstract

The modern four-stroke, poppet valve, direct injection, gasoline engine has improved combustion efficiency, reduced emissions and greater engine performance when compared to the port-fuel injected engine. In parallel, two-stroke, piston-ported engine designs have also evolved. However, their greater pollution levels have limited their potential in the market. Two-stroke operation offers higher specific power output than four-stroke, while at part load, four-stroke operation offers better fuel consumption. Therefore, a combination of the two operating systems, in a poppet valve engine design, presents a potential solution to these problems. On the other hand, two-stroke engine operation generates more power and torque and the corresponding heat transfer is higher. For four-stroke engines, thermal studies have historically been carried out on many different types of engines. In contrast, twostroke, poppet valve engine thermal studies are very limited.

Date of Award	Jun 2010
Original language	English
Awarding Institution	University of Brighton