Laminar Flame Speed Measurements from Chemiluminescence of OH* and CH* in CH4-, H2-, and C2H2-Air Flames
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2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. An experimental study of laminar flame speed of spherically expanding methane-air flames measured from chemiluminescence of OH* at 306 nm and of CH* at 430 nm is presented for the first time. Chemiluminescence of intermediate radicals is indicative of the high-temperature reaction zone of the flame, and can be used to measure laminar flame speed in a similar fashion to the widely used schlieren imaging technique. Flame speeds for one atmosphere and room temperature methane-air flames were measured for equivalence ratios of 0.7 to 1.3 in increments of 0.1. There was no significant difference between flame speeds measured from different wavelengths of chemiluminescence. The averaged flame speed measurements ranged from 15.7 cm/s at =0.7 to 36.7 cm/s at =1.1. The new data are in good agreement with spherically expanding flame data from the literature, indicating that chemiluminescence can be used to extract accurate laminar flame speed measurements from spherically expanding flames.
