A Generalized Base-Flow Analysis with Initial Boundary-Layer and Chemistry Effects

A general theory has been developed for the supersonic, turbulent, near-wake region behind bluff-based, two-dimensional and axially symmetric bodies in the presence of a coaxial, supersonic jet. This work is a generalization of the theory of H. H. Korst and his co-workers. The present theory includes the effects of the initial boundary layer, base bleed, total enthalpy and species differences, and equilibrium chemistry. The generalization was accomplished through the development of an analytical recompression model that obviates the requirement for a recompression factor; the development of a species distribution model for the mixing layers; and the use of a new spreading parameter for the axially symmetric problem. The theory shows good agreement with experiment for the classical, planar-backstep problem with both thin and very thick boundary layers. Good agreement is also shown with base flows behind axially symmetric bodies with a coaxial jet. Prepared in cooperation with ARO, Inc., Tullahoma, TN.