Accession Number:

ADA235309

Title:

Boron Combustion Model Development with Kinetic Sensitivity Analysis and Measurement of Key Chemical Rate Parameters

Descriptive Note:

Final rept. 1 Jan 1988-31 Dec 1990

Corporate Author:

AERODYNE RESEARCH INC BILLERICA MA

Report Date:

1991-01-01

Pagination or Media Count:

109.0

Abstract:

This report presents kinetics models for the chemically facilitated gasification of the ubiguitous boron oxide coating that inhibits particulate boron ignition and the second stage high temperature boron surface burning that occurs once the oxide coating has been removed. These models include a homogeneous gas phase oxidation mechanism consisting of 19 chemical species and 58 forward and reverse elementary reactions, multicomponent gas phase diffusion and heterogeneous reactions between gas phase oxidation products and the boron oxideboron surface. Kinetic mechanisms are formulated to describe the heterogeneous surface reactions for both B2031 and Bs surfaces in terms of simple adsorption and desorption reaction steps. Thermochemical parameters for these reaction steps are estimated from the current heats of formation and gas phase bond energies for the major reactants. Reaction rate parameters are estimated from available experimental data or using elementary transition state theory arguments.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE