An experimental database for diesel spray combustion

An experimental study has been made in an optically accessed research diesel engine to measure the influence of fuel injection pressure and nozzle hale diameter on spray penetration, spray cone angle, and flame liftoff distance. The experiments are documented with data for the fuel injection pressure, the rate of injection, rate of heat release, and cylinder pressure. The optical in-cylinder investigations comprise measurements of spray propagation, spray tip velocity near the nozzle (spray discharge velocity). and flame liftoff position. The experiments provide a set of data describing the influence of fuel injection pressure, nozzle hole diameter, and nozzle type on spray discharge velocities, spray propagation, and flame liftoff distance. in addition to the measurement of axial spray and flame parameters, a phenomenological study of lateral spray distribution gives demonstrative examples for the stability and possible fluctuations of spray direction, as well as spray width variations between the start and end of injection. The data demonstrate the governing influence of fuel injection pressure and spray hole diameter on the temporal and spatial distribution of the spray and consequently on the location of autoignition and flame distribution. The study also includes an analysis of the influence of the internal nozzle geometry-that is, the inflow conditions into the nozzle holes-on spray tip propagation.