(1967-10) Bryan, R. H.; Lefebvre, A. H.; Norster, Brian
Visual observations and an optical method of measuring the mean
droplet size in sprays have been used to assess the performance of a
prototype airblast atomiser, particularly at the low fuel and air flow
conditions corresponding to engine cranking.
The results obtained from this and a shroud version of the same
basic atomiser have enabled design modifications to be made which have
resulted in a marked improvement in performance, both in terms of the
spraying characteristics of the atomiser at low fuel and air flows, and in
terms of the measured droplet size produced. The latter for the final design
was very close to that predicted by Wiggs for airblast atomisers operating
at the test conditions employed.
An apparatus has also been designed to enable tests on the
atomisation quality of airblast atomisers to be carried out at pressures
up to 250 p.s.i.,, using the same optical technique to make mean droplet
size measurements.