Accession Number : AD0657767

Title :   RESTRICTED VARIATIONAL PRINCIPLE METHOD FOR THE PREDICTION OF LOW-DENSITY TRANSITIONAL REGIME CONE DRAG,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LABS DIV

Personal Author(s) : Ortloff,Charles R.

Report Date : JUN 1967

Pagination or Media Count : 32

Abstract : Rosen's restricted variational principle representation of the Boltzmann equation was applied to the problem of determining the transitional regime low-density hypersonic flow over slender conical vehicles with diffusely reflecting surfaces. By means of a suitable choice of a trial distribution function, the Euler-Lagrange equations derived from Rosen's functional result in a semilinear hyperbolic system amenable to solution by classical characteristics methods. Sample calculations are given and compared with the low-density cone flow experiments of Hickman for assessment of the accuracy of the method presented. It is believed that this method constitutes the first solution method for boundary value problems in the low-density transitional flow regime. (Author)

Descriptors :   (*CONICAL BODIES, *DRAG), (*HYPERSONIC FLOW, SLENDER BODIES), BOUNDARY LAYER TRANSITION, DISTRIBUTION FUNCTIONS, BOUNDARY VALUE PROBLEMS, DENSITY

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE