Accession Number : AD0671585

Title :   EXPERIMENTAL DETERMINATION OF DRAG FACTOR FOR A SPHERE IN A SUPERSONIC RAREFIELD GAS FLOW (EKSPERIMENTALNOE OPREDELENIE KOEFFITSIENTA SOPROTIVLENIYA SHARA V SVERKHZVULKOVOM POTOKE RAZREZHENNOGO GAZA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Sukhnev,V. A.

Report Date : 29 AUG 1967

Pagination or Media Count : 9

Abstract : A large number of experiments were conducted in a low density wind tunnel to determine the drag coefficient of a sphere in the Mach and Reynolds number range 3.6 < M < 6.0, 2 < R < 500. The sphere surfaces were highly polished; the diameters varied between 1 and 14 mm. A special effort was made to determine the effect of model support (sting) on the total shere drag. This was done by two sets of experiments. First, the total moment on the sphere was measured including the support and secondly, the drag was measured with the support flush with, and separated from the model. The experimental data obtained in this manner showed that the effect of the sting on the drag C sub x was of order 3-5% for a sting-to-sphere diameter ratio of 0.1. The effect of surface roughness on C sub x was tested by scratching the sphere surface. Within the experimental accuracy no effect could be observed on the sphere drag coefficient due to such surface roughness. (Author)

Descriptors :   (*RAREFIED GAS DYNAMICS, *DRAG), SUPERSONIC CHARACTERISTICS, SPHERES, REYNOLDS NUMBER, WIND TUNNEL MODELS, SURFACE ROUGHNESS, NOZZLE GAS FLOW, USSR

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE