Cars Spectroscopy of Gun Propellant Flames - Higher Hot Band and Concentration Effects
Abstract
Nitrogen Coherent Anti-Stokes Raman Scattering (CARS) spectra from nitrate-ester propellant flames contain several features not reported in nitrogen CARS spectra from other flames. Prominent among these features is a high intensity peak (30% maximum) 30 cm(-1) to the low energy side of the first hot band. Nitrogen CARS spectra from air/argon mixture containing from 1% to 30% air changed substantially with concentration but agreed with calculated spectra to better than 6%. Nitrogen CARS spectra from propane/air flames of various equivalence ratios showed a resolved second hot band, Q(32) at 2,269 cm(-1) and the presence of the third hot band, Q(43), near 2,241 cm(-1). Temperatures determined from Q(32) agreed, within experimental error, with those determined with Q(10) at 2,296 cm(-1). Temperature trends for the various equivalence ratios agreed with thermochemical predictions, allowing the accuracy to be assessed at better than 5%. The good agreement of nonplanar and planar BOXCARS validated the earlier planar BOXCARS measurements. Nitrogen CARS calculations agreed well with experimental propellant spectra at the 10% nitrogen concentration expected from thermochemical calculations. The calculated spectra show the presence of Q(32) near 30% maximum intensity as seen in the propellant spectra.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1982
- Accession Number
- ADA112330
Entities
People
- L. E. Harris
Organizations
- United States Army Armament Research, Development and Engineering Center