Technical Paper
Numerical Study of the Effect of Injection Strategy and Compression Ratio on Gasoline/Diesel Fueled RCCI Engine
2018-10-30
2018-32-0017
RCCI engine is proven to have better combustion control and to produce very low NOx and soot emissions. However, its operations is limited by HRR and PPRR as well as weak combustion efficiency which results in high levels of HC and CO emissions. Engine geometry and operation parameter such as injection strategy and compression ratio can affect the reactivity of fuels in cylinders as well as the gas temperature increase rate which are the important factors in controlling RCCI combustion. Injection strategies such as single and double injections have been previously studied but the effects are still unpredictable and the effects of compression ratio towards combustion characteristic and emissions require further analysis. This work deploys a 3D computational fluid dynamic (CFD) combustion model to study the effects on combustion characteristic and emissions with respect to single injection, double injection strategy and compression ratio.