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.
In this paper, combustion process was simulated on diesel engine with n-butanol/diesel blends in 3000 r/min, 300 Nm using AVL FIRE ESE Diesel. By comparison with indicator diagram, simulation results were consistent with the test results using pure diesel and 5%(volume of n-butanol) n-butanol/diesel blends. Using the calculation model combustion in cylinder is calculated burning B10(mass friction of n-butanol is 10%), B20 and B30 n-butanol /diesel mixture. The results show that the maximum combustion pressure and temperature gradually increases, and accumulated heat of release slightly reduces with the adding of n-butanol. BSFC increases, but indicated efficiency reduces. Mass friction of soot significantly reduce, and mass friction of NOx firstly decreases then increases with the adding of n-butanol. This will provide a basis to the research of n-butanol as substitute fuel.
In order to develop a new fuel alternative for the diesel engine, experiment of combustion and emission characteristics was carried on a high pressure common rail diesel engine fueled with diesel and acidic oil biodiesel blends, then the results were compared and analyzed. The results indicate that after adding acidic oil biodiesel, the ignition delay is prolonged, combustion pressure, maximum rate of pressure rise and maximum combustion temperature all increase. The maximum combustion heat release rate of blended fuel is higher than diesel at low and middle loads, and lower at high load condition. Compared with diesel, HC emissions of blends decrease dramatically with the increases of blending ratio. NOX emissions of blends are slightly higher than diesel. CO emissions of blends are almost the same as that of diesel. According to the results, acidic oil biodiesel has wide application prospects as an alternative fuel.
Experiment of fuel combustion and emission characteristics was carried on a turbocharged intercooled electronically controlled high pressure common rail diesel engine with n-butanol/diesel blends, then the results of experiment were compared and analyzed. The results show that with the adding of n-butanol, the maximum combustion pressure gradually increases and the maximum heat release rate gradually reduces; compared with diesel, CO emissions of the blends are slightly lower and decrease with the increasing load; HC emissions of the mixture fuel are higher and decrease first then increase with the increasing load; at 2000rpm, NOX emissions of the blends are a little lower than the pure diesel in small loads but higher in other loads, and increase with the adding of the load.
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