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Title

NUMERICAL ANALYSIS OF LAMINAR FLAME SPEED FOR H2 -NH3 -AIR MIXTURES IN PREMIXED JET FLAMES

Writers

ALI ABAZARI Y.

Pages

 Start Page | End Page

Abstract

 A NUMERICAL STUDY OF LAMINAR FLAME SPEEDS FOR PREMIXED H2 -NH3 -AIR JET FLAMES IS CARRIED OUT FOR 0 TO 80% NH3 IN H2 FOR DIFFERENT EQUIVALENCE RATIOS FROM LEAN TO RICH CONDITIONS. FLAME SPEED PREDICTIONS HAVE BEEN CONDUCTED BY CHEMKIN PACKAGE OVER A WIDE RANGE OF CONDITIONS. THESE DATA ARE THEN USED TO VALIDATE BY EXPERIMENTAL FLAME SPEEDS IN LITERATURE. THE RESULTS DEMONSTRATED THAT THESE MECHANISMS PERFORM WELL FOR H2 -AIR COMBUSTION. DIFFERENCES IN FLAME SPEEDS AND ASSOCIATED RADICAL SPECIES CONCENTRATIONS (H, O, AND OH) ARE FOUND TO BE LARGEST FOR HIGHER LEVELS OF NH3 AND WITH INCREASING EQUIVALENCE RATIO. IT IS ALSO REVEALED THAT OH IS THE KEY RADICAL LEADING TO NH3 DECOMPOSITION AND IS A LIKELY SOURCE OF DEVIATION BETWEEN MODEL PREDICTIONS. THE NUMERICAL DATA SHOW THAT GRI-MECH 3.0 MECHANISM IS THE CAPABLE OF ACCURATELY PROJECTING REDUCTIONS IN FLAME SPEED AS MUCH AS 90 TO 95% WITH NH3 ADDITION.

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