Accession Number : AD0663421

Title :   A NOTE ON THE DRAG COEFFICIENT EVALUATION FOR CONICAL VEHICLES IN THE LOW-DENSITY TRANSITIONAL FLOW REGIME.

Descriptive Note : Rept. for Jul-Sep 67,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Ortloff,C. R.

Report Date : OCT 1967

Pagination or Media Count : 18

Abstract : A general expression for the drag coefficient for a slender conical vehicle moving at hypersonic velocity in the low density transitional flow regime is obtained in this note. The method of calculation of C sub D follows from Rosen's variational method of solution of the Boltzmann equation previously reported by the author in the literature. The theoretically predicted drag coefficient from the variational method is given in the Knudsen number range .01 < Kn < 100. Results are compared to existing continuum, viscous interaction, near free molecule, and free molecule theories in the regions where predictions of these theories overlap results obtained from the variational method. (Author)

Descriptors :   (*CONICAL BODIES, *DRAG), (*BOUNDARY LAYER TRANSITION, DRAG), SKIN FRICTION, SLENDER BODIES, RAREFIED GAS DYNAMICS, KNUDSEN NUMBER, MATHEMATICAL ANALYSIS, DENSITY

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE