Accession Number : AD0845006

Title :   REST Semi Annual Progress Report 1 January through 30 June 1968. Volume I. Displacement Interaction and Flow Separation on Cones at Incidence to a Hypersonic Stream.

Descriptive Note : Technical rept.,

Corporate Author : AVCO GOVERNMENT PRODUCTS GROUP WILMINGTON MA AVCO MISSILE SYSTEMS DIV

Personal Author(s) : Fannelop, Torstein K. ; Waldman, George D.

Report Date : JUL 1968

Pagination or Media Count : 55

Abstract : A theoretical analysis is presented for the boundary-layer flow about a blunted cone at incidence to a hypersonic stream. The boundary-layer problem is formulated in terms of streamline coordinates and the equations which result are solved exactly by means of an implicit finite-difference procedure. Methods available for solving the three-dimensional inviscid flow field are examined and found to be inefficient relative to the present boundary-layer method. A semi-empirical method for calculating the inviscid surface pressure rapidly and accurately is presented together with details of the corresponding streamline tracing procedure. The method can account for changes in the local inviscid pressure due to boundary layer displacement effects. Converged solutions of the displacement pressure interaction problem are obtained by coupling the boundary layer and inviscid methods in a step-by-step iteration procedure. The effects of displacement interaction are particularly important on the leeward side. The relationship between these effects and incipient separation is discussed. (Author)

Descriptors :   (*CONICAL BODIES, HYPERSONIC CHARACTERISTICS), NOSE CONES, THREE DIMENSIONAL FLOW, FLOW SEPARATION, SLENDER BODIES, BLUNT BODIES, VISCOSITY, PERTURBATION THEORY, LAMINAR BOUNDARY LAYER, SECONDARY FLOW, EQUATIONS OF MOTION, PRESSURE, LOAD DISTRIBUTION, DEFLECTION, WALLS, SHEAR STRESSES, BOUNDARY LAYER.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE