Experimental Study of the Spray Characteristics of n-Butanol/Diesel Blends

Abstract

we studied the spray characteristics of n-butanol/diesel fuel blends using a high-speed camera and schlieren system, and analyzed the effect of different fuels, ambient pressure and injection pressure conditions on the spray penetration, spray cone angle, spray area, et al. The results showed that, at the same injection pressure, as the increase of ambient pressure, the spray cone angle of the same volume of fuel increases gradually, the spray penetration and the spray area decreases; under the same ambient pressure, the spray penetration, spray cone angle and spray area increase gradually with the increasing injection pressure, but when the injection pressure increases enough, the parameters are roughly the same; and the parameters basically all increase with the adding of n-butanol.

Characteristics of Diesel/N-Butanol Blend on a Common Rail Diesel Engine with Exhaust Gas Recirculation

“…The lower the viscosity and surface tension, the easier the fuel spray breaks into smaller droplets [17]. Wu et al [15] found that the air entrainment around the blend enhanced and the spray in front became more disorder after mixing n-butanol. In addition, the color of spray head was shallower than basic fuel, which suggested that spray particle size became smaller and the atomization was more uniform with n-butanol blending [15].…”

“…Wu et al [15] found that the air entrainment around the blend enhanced and the spray in front became more disorder after mixing n-butanol. In addition, the color of spray head was shallower than basic fuel, which suggested that spray particle size became smaller and the atomization was more uniform with n-butanol blending [15]. Accordingly, a large and uniform fuel/air mixture is beneficial to speed up the fuel combustion.…”

“…Researches have confirmed n-butanol with molecular structure CH 3 (CH 2 ) 3 OH is a promising diesel alternative. Previous studies on spray characteristics showed that adding n-butanol in diesel making the spray cone angle increase in most cases [14][15][16][17]. Wang et al [18] found that the ignition delay (ID) prolonged and the premixed combustion ratio obviously increased with n-butanol addition.…”