Experiment and analysis of spray characteristics of biodiesel blending with di-n-butyl ether in a direct injection combustion chamber

Investigation of the Spray Development Process of Gasoline-Biodiesel Blended Fuel Sprays in a Constant Volume Chamber

“…Overall, the spray penetration increased as the blending ratio of the biodiesel increased. These results were confirmed as a trend similar to the result reported by Fu et al [23]. Moreover, the difference of the spray penetrations of the different fuels was remarkably reduced as the injection pressure increased.…”

“…The low viscosity and surface tension of the fuel tended to interfere with penetration in the direction of the spray axis and tended to spread in the radial direction due to interfacial shearing instabilities at the spray surface during the spray development process. This analysis is similar to the analysis from recently reported literatures of the spray characteristics of the biodiesel-blended fuel [23][24][25]. As shown in Figure 7, under all injection pressure conditions, there was no visible difference of the spray projected areas of the different fuels.…”

“…They calculated the penetration, projected area, and spray cone angle for the initial spray and concluded that the biodiesel spray generated the worst spray atomization due to its high density and surface tension. Other researchers have reported similar conclusions based on comparisons of different fuels via microscopic investigations [22][23][24]. Due to biodiesel's high oxygen content, complete combustion is possible.…”

“…Fu et al reported that spray tip penetration and spray cone angle were highly affected by di-n-butyl ether composition in blended fuel. They revealed that a high di-n-butyl ether composition could improve spray atomization of biodiesel [23,29]. Yanuandri compared GB20 (gasoline 80%, biodiesel 20%) and diesel fuel modes in a single-cylinder diesel engine to investigate the peak pressure rise rate, combustion phasing, ignition delay, and NOx and HC emissions [30].…”

Experimental and numerical study on the initial tip structure evolution of diesel fuel spray under various injection and ambient pressures

“…The results showed the internal flow regime might be the main factor that influenced the tip structure of the spray. Fu et al [17] experimentally studied the spray macro characteristics of the mixture of bio-diesel and di-n-butyl ether including spray tip penetration, spray cone angle, maximum spray width and spray tip velocity using a schlieren optical system under different ambient and injection pressures. However, the evolution of tip structure of spray under the same conditions were not reported in their work.…”