Radiative properties of burning ammonium perchlorate/aluminum pressed pellets
The spectral intensity emitted at 790 nm during the combustion of pressed pellets composed of ammonium perchlorate (AP) and aluminum has been optically measured. Aluminum mass fraction content was varied from 0.5% to 6.0%. The combustion bomb pressure ranged from the low pressure deflagration limit (near 650 psia) to 1100 psia. Based on the intensity measurements, the effective blackbody emission temperature of the flame was near 2600 K for the 6% Al samples. This figure is well above the local gas temperature (AP monopropellant flame temperature 1400 K) and in excess of the adiabatic flame temperature (1700 K to 2400 K depending on the APAl mass fraction) assuming equilibrium. The higher intensities were attributed to the AlAl/sub 2/O/sub 3/ flame surrounding the molten Al droplets as well as the droplet itself. The measured peak intensity levels were restricted to a thin layer of the flame immediately above the deflagrating surface of the pellet. A two part model of the radiant transport in the flame was developed for comparing the theoretical and measured spectral intensities to estimate the magnitude of the radiative parameters of the burning Al droplets. From this model the optical depth of the Al/sub 2/O/sub 3/ flame envelope surrounding a droplet was estimated. In addition, a range of probable values for optical properties of the aluminum droplets as well as their temperatures were found.
- OSTI ID:
- 5021715
- Report Number(s):
- CONF-870484-
- Resource Relation:
- Conference: Western States Section of the Combustion Institute spring meeting, Provo, UT, USA, 6 Apr 1987; Other Information: Technical Paper WSS/CI 87-13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM
COMBUSTION KINETICS
AMMONIUM PERCHLORATES
FLAMES
RADIANT HEAT TRANSFER
PROPELLANTS
BLACKBODY RADIATION
COMPOSITE MATERIALS
DROPLETS
EMISSION SPECTROSCOPY
FUEL PELLETS
HIGH PRESSURE
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PRESSURE EFFECTS
THERMAL RADIATION
VERY HIGH TEMPERATURE
AMMONIUM COMPOUNDS
CHEMICAL REACTION KINETICS
CHLORINE COMPOUNDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY TRANSFER
HALOGEN COMPOUNDS
HEAT TRANSFER
KINETICS
MATERIALS
METALS
OXYGEN COMPOUNDS
PARTICLES
PELLETS
PERCHLORATES
PHYSICAL PROPERTIES
RADIATIONS
REACTION KINETICS
SPECTROSCOPY
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
400102 - Chemical & Spectral Procedures