Observatoin of Flame Structure at Low Damkoehler Number Fields.

We discussed the flame structure of piloted lean turbulent premixed flames, equivalence ratios of which were around the lean flammable limit. Laser tomography, chemiluminescence detectors, LDV and a thermocouple were used simultaneously for observing lean turbulent premixed flames with silica powder seeded. As a result, the transition of flame structure from a distributed reaction zone to a wrinkled laminar flame was observed in detail with the observing position being traversed from upstream to downstream.