Abstract:
This thesis reports the results of a detailed programme of
research on airblast atomization carried out using a specially
designed plain-jet atomizer in which the fuel is injected into
a high velocity airstream in the form of a discrete jet. Because
recent studies on airblast atomization have been mainly confined to
sheet and then subjected on both sides to the atomizing action of
high velocity air, information was needed to carry out a
comparison between^the two mechanisms of atomization. It was in
order to obtain such information that the present investigation was
undertaken and the study essentially resolved into a detailed
experimental exploration of the spray characteristics of 1plain-j et1
airblast atomizers.
Specially prepared liquids were employed to distinguish
between the separate effects on S.M.D. (Sauter Mean Diameter of
spray) of viscosity, surface tension and density. The liquids
employed represented a range of values of viscosity from 1 .0 to
76 x 10 Kg/ms,/while surface tension and density were varied
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between 26 and 73 x 10 N/m and 794 and 218oKg/m respectively.
Atomizing air velocities covered the range of practical interest
to the designers of continuous combustion systems and varied
between 70 and 180 m/s. The effect of scale on S.M.D. was studied
using several different fuel injectors varying in orifice diameter
between 0.39 and 1.58 mm.
A detailed description of the light-scattering technique for
drop size measurement is included...