Evolution of a high-pressure spray from a swirled gasoline injector 2001-24-0055
An extensive experimental work has been made in order to analyze
the structure of the spray of a large-angle single-hole
high-pressure swirl injector for direct-injection spark-ignited
(DISI) gasoline engines. Spatial and temporal evolution
measurements of the spray have been carried out in an optically
accessible vessel. The spray has been lighted by an 80 mm thickness
and 12 ns duration pulsed laser sheet, generated by a 532 nm Nd-YAG
laser, both along the spray axis and in cross sections
perpendicularly to it.
The scattered light has been collected at 90° from the laser
sheet direction by a digital CCD camera with a frame grabber
synchronized to the single-shot injection command and the laser
start pulse. A digital image processing system has allowed
analyzing the images collected by the CCD camera. It has been
possible to visualize the formation and the spatial and temporal
evolution of the initial liquid slug (pre-spray) and of the
hollow-cone and solid-cone stray structure. Many changes in the
internal spray structure at different distances from the nozzle
have been observed.
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