Abstract
Spray behavior is regarded as one of the main factors influencing engine
performances, fuel consumption and emissions for diesel engines. Under high
injection pressure, diesel spray behaviors are extremely sensitive to the nozzle
internal geometries, especially the geometric structures of orifice entrance. Based
on the synchrotron radiation X-ray tomography technique, the 3D digital models of
nozzle tips can be constructed. A new automatic method is presented to reveal the
inlet structures according to these nozzle orifice models. The planes passing
through the orifice axis are determined and used to cut the models, and then the
corresponding cutting images are applied to measure the inlet chamfer radii around
the orifice axis automatically. The orifices of a single-hole nozzle and an
eight-hole nozzle are measured according to this method. The results show that this
method can automatically measure the orifice inlet chamfer radii around the orifice
axis with high precision. The obtained inlet chamfer radius shows the whole profile
of the orifice entrance, which is a precise feedback for nozzle designing and
manufacturing, and it also provides precise geometrical boundary conditions for the
study of spray behaviors.
© 2014 Chinese Optics Letters
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