Accession Number:

ADA199961

Title:

Carbon Monoxide and Turbulence-Chemistry Interactions: Blowoff and Extinction of Turbulent Jet Diffusion Flames

Descriptive Note:

Final rept. 1 May 1985-1 Jun 1988

Corporate Author:

GENERAL ELECTRIC CO SCHENECTADY NY RESEARCH AND DEVELOPMENT CENTER

Personal Author(s):

Report Date:

1988-08-31

Pagination or Media Count:

78.0

Abstract:

Turbulence chemistry interactions have been studied experimentally and theoretically in the context of turbulent diffusion flames. The goal is a quantitative understanding of these interactions under a wide range of conditions. These range from low Reynolds number conditions weak interactions, affecting primarily the levels of intermediate species, pollutants and combustion efficiency to high Reynolds number conditions, where the flame can be extinguished by intense turbulent straining. Jet flames in coflowing air have been emphasized, with a coannular pilot burner used where necessary for stabilization at the burner lip. Fuels have consisted of carbon dioxideH2 mixtures with the fraction of hydrogen successively reduced to promote extinction. Reynolds numbers have been increased to the point of blowoff. Major species and temperature have been measured by Raman scattering, and velocity and turbulence have been measured by laser velocimetry. These experiments have provided a comprehensive set of data on COH2 flames, extending to conditions conducive to localized extinction. The data show significant temperature decrements due to finite-rate chemistry but no evidence of localized extinction. Keywords Turbulence, Chemistry interactions, Extinction, Turbulent diffusion flames, Superequilibrium, Laser diagnostics.

Subject Categories:

  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE