On the Intermittent Spray Characteristics

The quality of spray atomization ejected from an injector has a definitive influence upon the engine's performance. Furthermore, considerable attention to the Earth's environmental pollution is increasing now more than ever before. This experimental investigation has been carried out to clarify the characteristics of the intermittent spray using a pintle type gasoline fuel injector. Both the image processing system and the Phase Doppler Anemometer are utilized for the visualization of a spray behavior and the simultaneous measurements of dropsizes and their velocities, which have been conducted at the axial downstream from the injector exit plane. The fuel injection duration was fixed at 3ms and the injection pressure was varied from 250 kPa to 350 kPa. For a high injection pressure of 350 kPa, the spray tip arrival time was fluctuated at the vigorously disintegrated regions. It evidently shows a linear correlation between the axial velocity and the fuel drop size farther downstream.[PUBLICATION ABSTRACT]