Opposed Jet Turbulent Diffusion Flames
Abstract
A Hydrogen-Helium mixture was chosen to investigate the structure of a counterflow diffusion flame. Reacting and non reacting conditions were studied at the same Reynolds number. To study the reaction zone structure, high speed tomography based on Mie scattering was employed using a copper vapor laser and a Fastax high speed camera. LDV measurements were also obtained. Different seeding techniques were used to visualize both the turbulent air and fuel jets. The tomographic records were digitized and recorded in a digital computer for statistical treatment. Significant differences in the wrinkle scales between the reacting and non reacting flows were found. A fractal statistical analysis of the tomography records was done to quantify these differences. Seeding of both fuel and air jets provided a mean for the evaluation of the reaction zone thickness. The strain of the reaction zone was obtained from the time resolved tomographic records. Local flame extinction and reignition were observed for different H2/Helium fuel mixtures. Keywords: Turbulent diffusion flames, Rayleigh scattering.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 05, 1990
- Accession Number
- ADA227048
Entities
People
- L. Talbot
Organizations
- University of California, Berkeley