Flame stretch measurements during the interaction of premixed flames and Kármán vortex streets using PIV

• Published in: Combustion and flame 1996-04, Vol.105 (1), p.167-179
• Main Authors: Nye, D.A, Lee, J.G, Lee, T.-W, Santavicca, D.A
• Format: Article
• Language: English
• Subjects: Applied sciences; Combustion of gaseous fuels; Combustion. Flame; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Theoretical studies. Data and constants. Metering
• ISSN: 0010-2180; 1556-2921
• DOI: 10.1016/0010-2180(95)00186-7

Flame stretch measurements in a premixed, lean methane-air, V-flame interacting with a Kármán vortex street have been made using a particle image velocimeter. The flame curvature and strain rate along the flame have been measured over the range of −2.0–1.0 mm −1 and −175-175 s −1, respectively, which corresponds to a range of flame stretch from −475-200 s −1. Results indicate that the curvature and strain rate are statistically independent. Flame stretch statistics based on individual flames are also considered since each flame represents a particular phase within the regular and periodic interaction cycle studied. These results indicate that for a particular flame the average stretch rate becomes independent of the average flame strain rate. A comparison among PIV measurements, OH planar laser-induced fluorescence (OH-PLIF) measurements, and numerical simulation reveals similar flame stretch statistics. Qualitative measurements concerning flame shape and the relative location of vortices within the reactant flow are also discussed.