Experimental Investigation of a CO-H2 Diffusion Flame Using High-Frequency Thermometry
Abstract
The purpose of this investigation was to measure the radial temperature profiles as a function of time in a non-sooting CO-H2 diffusion flame at high repetition rates. Measurements were taken from the nozzle exit up to 200 mm above the nozzle in 10 mm increments. The results of such an analysis at Re=857 revealed the existence of low frequency (25-30 Hz) oscillating structures in the outside reaction layer associated with the dynamics of large scale buoyancy-driven vortices, and high frequency (300-325 Hz) oscillations believed to be associated with local instabilities of the internal jet core of the flame. Other H2-CO:N2 gas mixtures (at Re=1717, 2099, and 2264) we re investigated and similar high frequency oscillations were found. In this research the novel thin filament pyrometry technique was employed; this technique relies upon the blackbody emission of a thin ceramic filament (SiC) in a combusting flowfield. A limited Fourier Transform frequency analysis was carried out.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1987
- Accession Number
- ADA189579
Entities
People
- Moises F. Alvaro
Organizations
- Air Force Institute of Technology