Accession Number : ADA182119

Title :   Radiative and Convective Heat Transfer over Ablating Composite Flat Surface in Hypersonic Flow Regime.

Descriptive Note : Final rept. 1 Sep 86-1 Mar 87,

Corporate Author : ADVANCED TECHNOLOGIES AND TESTING LABS GREENSBORO NC

Personal Author(s) : Goswami,D Y

PDF Url : ADA182119

Report Date : 22 Apr 1987

Pagination or Media Count : 103

Abstract : A computer program was developed for predicting the convective and radiative heat transfer to the surface of a flat with hypersonic boundary layer flow and with injection of absorbing, emitting and scattering particles due to ablation. The program was used to study the heat transfer rate as a function of wall and freestream temperatures and Mach number of the flow. The results were also obtained to study the effect of injection of absorbing and scattering particles in the boundary layer on the heat flux as a function of wall and free-stream temperatures, Mach numbers and particle radiative properties. It is seen that, if there is a strong external incident radiation, the injection of scattering particles reduces the radiative flux by as much as 75% depending on the scattering coefficient of the particles and the particle density in the flow. A review of the published literature shows that the data of the radiative properties of particles is lacking. Also the data of the radiative properties of modern composite materials surfaces is not available. Keywords: Radiative; Convective; Heat transfer; Absorption; Scattering; Hypersonic flow; Ablation; Radiative properties.

Descriptors :   *COMPOSITE MATERIALS, *CONVECTION(HEAT TRANSFER), *HYPERSONIC FLOW, *RADIATIVE TRANSFER, ABLATION, COMPOSITE STRUCTURES, SURFACES, ABSORPTION, FREE STREAM, TEMPERATURE, HEAT TRANSFER, BOUNDARY LAYER, COMPUTER PROGRAMS, HEAT FLUX, RATES, WALLS, FLAT PLATE MODELS, MATHEMATICAL PREDICTION, RADIATION ABSORPTION, THERMAL PROPERTIES, HEAT TRANSFER COEFFICIENTS, METALS, ALLOYS, CERAMIC MATERIALS, SOOT, HYPERSONIC VEHICLES, HYPERSONIC FLOW, MACH NUMBER, DENSITY, PARTICLES, RADIATION, COEFFICIENTS, SCATTERING, INJECTION

Subject Categories : Thermodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE