Kinetics of Graphite Oxidation in Reacting Flow from Imaging Fourier Transform Spectroscopy
Abstract
This study investigates the kinetic and transport mechanisms of laser irradiated graphite oxidation using mid-wave infrared (MWIR) imaging Fourier transform spectroscopy (IFTS). Oxidation was studied for varying graphite materials and surface temperatures of 1000-4000 K in a dry air environment (20 O2, < 1 H2O). Samples were heating using a 1.07 mm continuous wave (CW) fiber laser while surface temperatures were monitored using a MW camera. The resulting oxidation plume was observed using MW IFTS at spectral resolution of 2 cm-1 and spatial resolution of 0.5 mm/pix with framing rates of 1 Hz. A two layer radiative transfer model (RTM) was used to infer spatial maps of temperature and species (CO, CO2) concentration from hyperspectral (spatial - spectral) data. Three flow conditions (buoyant, flat plate shear flow, and stagnation flow) were evaluated to determine the role of transport. Two simplified kinetic transport models are presented and compared with experimental data. Experimental results for the flat plate shear flow and stagnation flow represent the first spatially resolved measurements of reacting carbon oxidation flow, and are vital for validation of numerical work.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 21, 2016
- Accession Number
- AD1032022
Entities
People
- Ashley E. Gonzales
Organizations
- Air Force Institute of Technology