Comparative study on single-injection and pilot-injection strategies for DI CI engine fuelled with the butanol/diesel blend

ABSTRACT

The present paper discusses a comparative study of single- and pilot-injection strategy fuelled with diesel (i.e. Bu00) and 15% of butanol blend (i.e. Bu15). The effects of pilot injection timing (?33° bTDC to ?73° bTDC) and pilot injection fuel quantity (5–20%) with 15% of butanol blend were carried out numerically using CONVERGE CFD Code. The results show that in single-injection strategy, NOx, CO and soot emissions reduce, whereas UBHC emission increases with the addition of butanol content. In pilot-injection strategy, when the first fuel injection timing is advanced, the peak value of heat release rate (HRR) for the first injected fuel reduces, but marginally improves for the main injected fuel. Increasing the first injection fuel quantity, the HRR of the peak value for first injected fuel increases but the HRR of the peak value for second injected fuel reduces. Minimum ISFC was obtained at 10% of pilot injection fuel quantity and ?53° bTDC of pilot injection timing.