Flame propagation in a straight duct with a 90 degree curved section.

摘要

Work was performed to commission s flame propagation duct with an attached 90{dollar}spcirc{dollar} bend. This work included the testing, fabrication and installation of associated hardware and flame detection instrumentation.; A testing program was initiated to investigate flame propagation in the duct utilizing propane/air mixtures. The testing program entailed the characterization of flame front propagation at subsonic velocities. This world also included the detailed study of the interactions of the propagating flame front and secondary flows developed in the 90{dollar}spcirc{dollar} bend. These secondary flows were the result of the induced motion of the unburned gas ahead of the flame front.; The results from this investigation indicated that flame propagation in the straight inlet section of the duct was characterized by distinctive velocity variation patterns for lean and very rich mixture conditions. For slightly rich mixtures, the flame propagation velocities were relatively steady, however a velocity variation pattern was still discernible.