Accession Number : AD0450558


Title :   BODY SHAPE EFFECTS ON AXISYMMETRIC WAKES


Descriptive Note : Technical rept.


Corporate Author : GM DEFENSE RESEARCH LABS SANTA BARBARACA


Personal Author(s) : Wilson, L N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/450558.pdf


Report Date : Oct 1964


Pagination or Media Count : 56


Abstract : Experimental measurements have been made of the distance of transition to turbulence of the wake behind hypersonic spherical and blunted cone models at hypersonic speeds in a ballistic range. Transition distances behind blunt bodies were found to be independent of body shape, whereas a definite shape effect was observed for slender bodies. A single shape parameter was determined which successfully correlated all the slender body data. The transition process was found to be markedly different between blunt and slender body flows, the transition occurring rather abruptly behind blunt bodies and being extended over many body diameters for slender bodies. In all cases, the transition distances were independent of body size and flight speed. The correlations were found to break down at high Reynolds numbers where turbulence originated at the recompression region. A method of using the distance to transition in clean wakes to discriminate between blunt and slender bodies is outlined. (Author)


Descriptors :   *AERODYNAMIC CONFIGURATIONS , *CONICAL BODIES , *HYPERVELOCITY PROJECTILES , REENTRY VEHICLES , SLENDER BODIES , DETECTION , ATMOSPHERE ENTRY , BOUNDARY LAYER , TURBULENCE , SPHERES , IMPACT SHOCK , WAKE , IDENTIFICATION SYSTEMS , BOUNDARY LAYER TRANSITION , HYPERSONIC CHARACTERISTICS , REYNOLDS NUMBER , HYPERSONIC TEST VEHICLES , BLUNT BODIES , GUIDED MISSILE DETECTION , SCHLIEREN PHOTOGRAPHY , HYPERSONIC FLOW , LAMINAR BOUNDARY LAYER , NOSE CONES , WAKE DETECTORS


Subject Categories : Aerodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE