Accession Number:

ADA550043

Title:

Studying the Formulation Effects on Steady-State and Transient Combustion Behavior of Aluminized Propellants

Descriptive Note:

Final rept. 6 Jul 1997-6 Jun 1998

Corporate Author:

RUSSIAN ACADEMY OF SCIENCES NOVOSIBIRSK INST OF CHEMICAL KINETICS AND COMBUSTION

Report Date:

1998-07-01

Pagination or Media Count:

77.0

Abstract:

The objective of work was to get experimental information about combustion behavior of metallized propellant, namely on evolution of condensed combustion products CCP and non-steady combustion characteristics. The study has been performed on model propellant 35 HMX, 25 AP, 20 Al, 20 nitrylDEGDN based energetic binder using two original methods-collection of CCP particles quenched at varied distance from burning surface and use of micro-force transducer for the recoil measurements of propellant sample burning in self sustaining regime or under perturbing conditions. The propellant follows to the classical agglomeration scenario with sizable growing of agglomerates containing practically entire amount of unburnt aluminum. There are following specific peculiarities in the agglomeration behavior 1. The main mass and size characteristics more strongly depend on pressure than on residence time for agglomerates in flame. 2. The content of unburnt aluminum in sieved fractions in the range 130-600 microns is approximately constant for each pressure levels in the range 1-64 atm. The density of agglomerates does not depend on size in the range 130-600 microns, but slightly increases with oxide content while pressure increases. 3. At pressure 65 atm no change in aluminum content is observed for resident time of agglomerates in flame in interval 30-95 ms, and amount of free aluminum in agglomerates has lowest value as compared with that for another pressures. At atmospheric pressure there is a noticeable change in aluminum content during time interval 20-25 ms. and then it is approximately constant while residence time is 25-70 ms. At pressure 22 atm the intermediate behavior is observed. No significant evolution of size distribution of agglomerates was observed even in the cases of 1 atm and 22 atm when burning out ofaluminum took place. Regarding the fine oxide particles, we may conclude that 4. In most cases the fine CCP particles size distribution has three modes

Subject Categories:

  • Combustion and Ignition
  • Solid Rocket Propellants

Distribution Statement:

APPROVED FOR PUBLIC RELEASE