Title

Effects Of Coaxial Air On Nitrogen-Diluted Hydrogen Jet Diffusion Flame Length And NoX Emission

Abstract

Turbulent nitrogen-diluted hydrogen jet diffusion flames with high velocity coaxial air flows are investigated for their NOx emission levels. This study is motivated by the DOE turbine program's goal of achieving 2 ppm dry low NOx from turbine combustors running on nitrogen-diluted highhydrogen fuels. In this study, effects of coaxial air velocity and momentum are varied while maintaining low overall equivalence ratios to eliminate the effects of recirculation of combustion products on flame lengths, flame temperatures, and resulting NOx emission levels. The nature of flame length and NOx emission scaling relationships are found to vary, depending on whether the combined fuel and coaxial air jet is fuel-rich or fuel-lean. In the absence of differential diffusion effects, flame lengths agree well with predicted trends, and NOx emissions levels are shown to decrease with increasing coaxial air velocity, as expected. Normalizing the NOx emission index with a flame residence time reveals some interesting trends, and indicates that a global flame strain based on the difference between the fuel and coaxial air velocities, as is traditionally used, is not a viable parameter for scaling the normalized NOx emissions of coaxial air jet diffusion flames.

Publication Date

1-1-2007

Publication Title

Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2007 "Chemical and Physical Processes in Combustion"

Number of Pages

641-650

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84946558461 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84946558461

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