This paper aims to improve thermal efficiency of spark ignition engine by numerical calculation with detailed chemistry. Experimental results from a four-stroke-single-cylinder engine are compared with that of simulations. It is experimentally found that peak efficiency is achieved at lean-limit combustion under excess air ratio λ=1.6. Due to engine output power loss, further investigations are conducted under lean-boost operations. The best condition of the lean-boost mode is at λ=1.3 and 150 kPa boosted pressure (abs). To further improve the efficiency without power loss, simulations are conducted under lean-boost combustion with dilution rate, high engine swirl, and high knock resistant fuel.
|ジャーナル||International Journal of Automotive Engineering|
|出版物ステータス||Published - 2015|
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Automotive Engineering
- Safety, Risk, Reliability and Quality
- Human Factors and Ergonomics