Experimental study on spray and combustion of butanol-diesel blends in a constant volume combustion vessel

Butanol is averypromisingalternativefueland able to be directly used in diesel engines. Visualization studies about spray and combustion of butanol-diesel blends are still scarce. In this work, a constant volume combustion vesselis used to study spray and combustioncharacteristics of butanol-diesel blends. Ambient oxygen concentration, ambient temperature and butanol concentration range from 9% to 21%, from 800 K to 1200 K and from 0% to 20%, respectively. Results show that the ascent stage of the FINL under 21% approximately coincides with that under 15% at 1200 K. The FLOL of 21% is approximately equal with that of 15% at 1200 K. The TINL of oxygen concentration 15% is the greatest at 1200 K. However, the TINL of 21% is higher than that of 15% at 800 K. These results can become important references for the choice of working conditions (EGR rate, injection timing and butanol concentration).