PRELIMINARY STUDY OF THE VISCOUS INVISCID INTERACTION IN THE LAMINAR SUPERSONIC NEAR WAKE

Abstract : An attempt is made to determine in a simple way the nature of the interaction of merging supersonic shear layers with an external inviscid flow in the heat conducting laminar near wake. For this purpose, a solution of the two-dimensional boundary layer equations using a twomoment integral method is examined. Several sample calculations of base flow are given which enable an evaluation of the Chapman model of instantaneous recompression. Also, a comparison is made with the earlier solution of Lees and Reeves for the adiabatic case in which Stewartson profiles were used. Despite the simplicity of the present analysis, good agreement is found for axis velocity ratios greater than -0.1; it is therefore concluded that the solution is not sensitive to assumed profile shape near and beyond the stagnation point. However, the importance of an adequate profile representation for the flow near the body is clear and the extension of the methods used herein to incorporate this improvement is discussed.