EXPERIMENTAL STUDIES ON BEHAVIOUR OF FLAME STRUCTURE DUE TO VORTEX IN V-GUTTER COMBUSTORS

摘要

In lean combustion, the heat release from the flame is maximum due to complete burning of fuel in the excess of oxygen. Lean combustion also exhibits twin occurrence of instability due to vortex shedding and acoustics developed due to heat release. This instability will lead to blowout and shrinkage in length of the flame. The flame inheritance to vortex is studied with the 60 degree V-gutter bluff body. The exit of V-gutter acts as a nozzle by accelerating the flow, enabling the formation of recirculation zone. The non-reactive measurement is made to understand the velocity field downstream of the V-gutter distributed along the length of the combustor. The recirculation zone length is predicted about 70 mm downstream off the combustor. The vortex structure approaching the blowout is studied in reactive flow, using image processing technique. The vortex flow and the net heat release rate are altered in the flow field and are visualized on the flame approaching blowout.