Abstract:
This report contains the results of an experimental investigation
into the interference of a ,rearward facing undeflected jet on the flow
over three afterbody shapes at subsonic speeds. The tests were performed
at a Reynolds number of 0.3 x 10(6) based on body diameter.
It was found that the form (or pressure) drag coefficient of the
bluff afterbody of a right cylinder increased appreciably with increase
in jet thrust coefficient. A similar but much smaller increase in form
drag was found on an ellipsoidal afterbody and a 'boat-tail'.
The effect of the jet was found to extend to approximately three
body diameters upstream of the jet exit but that beyond one body diameter
the effect was very small.
