Abstract
Previous experimental work by Baird has established that when a supersonic jet is first started it forms a vortex ring at the mouth of the jet pipe which subsequently travels downstream and carries with it a normal shock. This flowfield is here analysed on the basis of simplifying assumptions, in particular that when the vortex ring is sufficiently far from the mouth of the jet pipe the flow is steady in coordinates moving with the ring, and that time-dependent terms may be neglected. It is shown that the jet will be subjected to an adverse pressure gradient roughly where the shock forms (although the shock itself is excluded from the simplified mathematical model) and also that the vortex ring must grow in size at a slow rate. These results are in qualitative agreement with experiment.
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