Temperatures and Species Concentration in Propellant Dark Zones via Fitting Infrared (IR) Spectral Absorption Data.
Abstract
In a continuing investigation of the dark zone of double-base and nitramine propellants during self-sustained combustion, least-squares fitting has been developed and updated simulations of infrared (IR) spectral absorption data. Moreover, additional multichannel absorption experiments have been performed using a longer path length afforded by a 'triple pass' arrangement of the light beam. Propellant dark-zone spectra were obtained over the spectral region from 1,600 to 4,400 nm. Within this range, absorptions for HCN, H2O, N2O, CO, CO2, and CH4 have been detected through the use of a 1,024 element platinum silicide array detector with the ability to read complete spectra in 10 ms. Experimental dark-zone results for a nitramine propellant (XM-39) and a double-base-like propellant (JA2) have been obtained, and these absorption spectra have been analyzed with a full spectrum, multivariate, nonlinear, least-squares-fitting PC program that makes use of the HITRAN database for the required molecular information. In some cases, the absorption spectra of the molecule had sufficient detail and fidelity to allow determination of both temperature and absolute concentration. Comparisons of species concentration and dark-zone temperature measurements are made with other published measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1997
- Accession Number
- ADA326663
Entities
People
- B. E. Homan
- J. A. Vanderhoff
- M. W. Teague
- S. H. Modiano
Organizations
- United States Army Research Laboratory