Schlieren - Mie-scattering combined technique for image acquisition were built-up to study the liquid and vapor phases of a diesel fuel at engine-like conditions. The sprays were generated by a Common Rail injection system fuelling two axially-disposed single-hole injectors with k-factors 0 and 1.5. Three injection pressures were explored, 70, 120, and 180 MPa, while the sprays developed in a quiescent vessel filled with inert gas. The gas temperature varied from 373 to 900 K realizing both non-vaporizing and vaporizing conditions at back-densities typical of a diesel engine. Spray contours and penetrations of the liquid and vapor phase were extracted by processing the images of the spray acquired by a high-speed camera (40,000 fps) and enlightened by two pulsed LED light sources. The images were analyzed by digital processing software for distinguishing fuel spray from ambient gas. Mie-scattering for liquid phase and schlieren imaging visualization techniques for fuel evaporation were applied and the effects of the nozzle shapes on the fuel dispersion will be discussed.
Effect of the nozzle geometry on fuel dispersion in non-evaporative and evaporative conditions for a diesel injector
LMarchitto;A Montanaro;
2013
Abstract
Schlieren - Mie-scattering combined technique for image acquisition were built-up to study the liquid and vapor phases of a diesel fuel at engine-like conditions. The sprays were generated by a Common Rail injection system fuelling two axially-disposed single-hole injectors with k-factors 0 and 1.5. Three injection pressures were explored, 70, 120, and 180 MPa, while the sprays developed in a quiescent vessel filled with inert gas. The gas temperature varied from 373 to 900 K realizing both non-vaporizing and vaporizing conditions at back-densities typical of a diesel engine. Spray contours and penetrations of the liquid and vapor phase were extracted by processing the images of the spray acquired by a high-speed camera (40,000 fps) and enlightened by two pulsed LED light sources. The images were analyzed by digital processing software for distinguishing fuel spray from ambient gas. Mie-scattering for liquid phase and schlieren imaging visualization techniques for fuel evaporation were applied and the effects of the nozzle shapes on the fuel dispersion will be discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
