Laminar burning velocity of hydrogen-air premixed flames at elevated pressure

Experimental and numerical studies on the laminar burning velocity of hydro gen-air mixtures were performed. Measurements of laminar burning velocities were conducted using a new technique based on particle tracking velocimetr y (PTV) and image processing for burner-stabilized flames in a high-pressur e chamber. Equivalence ratios of the mixtures were varied from 0.6 to 3.0 f or the pressure range from 0.1 to 0.5 MPa. A numerical simulation was condu cted considering detailed reaction mechanisms and transport properties At h igh pressures, the experimental and numerical results agreed reasonably wel l with each other for mixtures of equivalence ratios of 1,0 and 2.0, while discrepancies were seen for the equivalence ratio 3.0. These discrepancies can be diminished effectively by modifying the rate-coefficient expressions of recombination reactions. (C) 2000 Elsevier Science Inc. All rights rese rved.