Accession Number : AD0427050


Title :   A BROAD SURVEY OF FREE-FLIGHT RANGE MEASUREMENTS FROM THE FLOW ABOUT SPHERES AND CONES


Descriptive Note : Technical rept.


Corporate Author : GM DEFENSE RESEARCH LABS SANTA BARBARACA


Personal Author(s) : Primich, R I ; Steinberg, M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/427050.pdf


Report Date : Sep 1963


Pagination or Media Count : 45


Abstract : Free-flight measurements of the flow about both non-ablating and ablating spheres, sphere-capped cylinders, and cones are reported. Included are radiometer measurements in the 0.2-5.5 micron band, image converter and schlieren photographs, microwave measurements of wake ionization, headon radar cross-section measurements, backscatter radar cross-section measurements of turbulent trails, and measurements of precursor ionization. Radiation results for non-ablating spheres, the effect of contaminants, and a comparison between sphere and cone results are presented. The status of the head-on radar results which include anomalous absorption is discussed. Precursor ionization ahead of non-ablating spheres was identified and attributed to photoionization. Comparative results of both schlieren and radar systems, which involve transition from laminar to turbulent flow and scattering from turbulent wakes are outlined. For cones, conditions cover velocities up to 22,000 ft/sec and pressures up to 150 mm Hg, while for spheres, velocities range up to 24,000 ft/ sec and pressures up to 300 mm Hg.


Descriptors :   *ATMOSPHERE ENTRY , *HYPERSONIC FLIGHT , SIMULATION , ABLATION , DOPPLER RADAR , SPHERES , GUIDED MISSILE DETECTION , INFRARED PHENOMENA , HYPERSONIC FLOW , RADIOMETERS , WAKE , TURBULENCE , CONTINUOUS WAVE RADAR , SCATTERING


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE