| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 85 === An experimental study is conducted on the influence of orifice
taper an-gle in pressure atomizer sprays. The atomizers made by
Monarch co. with type F80#1.00 hollow cone spray are redesigned
to fit our requirements. The orifices of them are 0.3mm in
diameter but with different outlet taper an-gles 0, 60, 75, 90,
and 105 degree individually. The results show that the
atomizers with orifice taper angles 75 and 90 degree produce
fine quality of sprays and their visible spray cone angles are
65 and 95 degree individually in lower injection pressure. But
the other atomizers with orifice taper angles 0,60,and 90 degree
produce poorquality of sprays and their visible spray cone
angles are all under 40 degree. The spray qualities of all cases
are improved with increasing in injection pressure, but the
spray cone angles of atomizers with orifice taper angles 75 and
90 degree are still larger than the others. Comparing the spray
quality, the SMD of the atomizer with orifice taper angle 90 de-
gree is the lowest of all. These results show that the
atomizer with proper orifice taper angle willproduce larger
spray cone angle, smaller SMD, and better spray quality.Except
swirler geometry,swirling chamber, and discharge orifice,the
effects of orifice outlet geometry on sprays also play an
important role in design-ing of pressure atomizer.
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