Temperature and OH Concentrations in a Solid Propellant Flame Using AbsorptionTechniques

摘要

Rotationally resolved absorption spectroscopy in the A-X (0,0) vibrational bandsystem of OH around 306.4 nm has been performed to determine the temperature and OH concentration in solid propellant flames. OH is sufficiently well characterized that the spectra can be least squares fitted under a variety of conditions. These conditions include the peculiarities of the experimental setup, instrument response parameters and absorption baseline, as well as the temperature and OH concentration. The multi-parameter least squares fit of the spectra gives values and statistical uncertainties for temperature, OH concentration, and other experimental design parameters. This technique has been applied to a nitramine propellant flame burning in a windowed combustion vessel pressurized with 1.5 MPa nitrogen. A propellant feed mechanism coupled to the combustion vessel extended the data taking time such that good quality OH absorption spectra could be obtained for this transient event. Here the light source was an arc lamp and the detector a spectrometer with an intensified photodiode array. Keywords: Absorption, Solid propellant, Combustion, Temperature, Pressure, Flame, OH Concentration, HMX1. (JES)