Accession Number:

ADA265727

Title:

Distributed Combustion in Solid Propellants

Descriptive Note:

Final rept. 1 Feb 1991-1 Feb 1992

Corporate Author:

BRIGHAM YOUNG UNIV PROVO UT DEPT OF CHEMICAL ENGINEERING

Personal Author(s):

Report Date:

1993-03-01

Pagination or Media Count:

58.0

Abstract:

This report summarizes work on a research program to quantify the effect of distributed combustion of metal particles in a Rijke burner. Under a previous contract experimental data were obtained with the Rijke burner, and a mathematical model of the burner was developed. To improve the model, the McIntosh flame model, based on large activation energy asymptotics, has been coupled to the acoustic model. Results have been compared to experimental data showing that the McIntosh transfer function is an improvement over previous models. Laws model of aluminum combustion has been modified to include the effects of multiple oxidizers and their products, oxide accumulation on the surface of the burning aluminum particle, and convection. There are no adjustable parameters in the improved aluminum combustion model, and both transport and thermodynamic properties are calculated internally. Results indicate that the modified model compares more favorably to experimental data than a simple liquid droplet model. The aluminum combustion model has also been coupled to the Rijke acoustic model. Calculations show a sensitivity to the size of the region of influence surrounding a particle and to the time lag between the particle response and the acoustic pressure. The results show reasonable agreement with available data for aluminum particles burning in the Rijke burner.... Unstable combustion, Distributed combustion, Acoustic instability.

Subject Categories:

  • Ammunition and Explosives
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE