Abstract
ASIMPLE analysis of the base pressure on a projectile with mass addition was sought, so that base drag reduction due to injection could be estimated. A numerical treatment was rejected, since only limited success has been achieved with this approach for simpler problems of the same type.1 The Crocco-Lees2'3'4 approach was not used, since it does not permit easy extension for injection3 or axisymmetric geometry.5'6 The approach of Refs. 7 and 8 that was successful for planar problems with injection was chosen as the starting point. That approach involves separate models for separate regions—the main mixing region, the corner/base region, and a recirculation region for low injection rates joined together. The main problem in any axisymmetric analysis is the selection of a pressure-angle relationship. For the planar arrangement, we used9
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