ID 263

Investigation of Gasoline Spray Added Biodiesel 5% on the Common Rail Diesel System

 

Abstract:

This paper focuses on the gasoline spray characteristics added biodiesel 5% to apply in gasoline compression ignition engines. Spray macroscopic visualization was performed by planar laser-induced fluorescence (PLIF) technique. The spray characteristics were, therefore, conducted by varying high injection pressures with the common rail diesel system of a diesel engine and controlling ambient pressure (back pressure) by filling nitrogen gas in the constant volume combustion chamber (CVCC). The test fuel, gasoline blended with biodiesel 5% (GB05), and conventional diesel as the reference were performed to compare its behavior. Chemical and physical properties of the GB05, gasoline, and biodiesel including viscosity, density, lubricity, cloud and pour point were measured. A high-speed video camera was employed to record the spray pattern with frame speed 10,000 f/s. The spray penetration length, cone angle, and velocity were measured and analyzed by image processing. Structure and density profiles were analyzed. As expected, 5% concentration of biodiesel significantly affected to enhance lubricity property of the GB. With small biodiesel concentration, the lubricity improves. When injection pressure was increased, the spray-penetration length was increased whereas the spray cone angle was slightly decreased. Under higher injection pressure, the turbulent structures are remarkable.