Introduction
- Need for swirl: imparting swirl into mainstream flow enhances flame stabilization.
- Swirl addition also enhances the rate of entrainment of fuel into air stream.
- The axial stream wise velocity decays with the swirl addition.
- The radial and axial pressure gradient creates the recirculation region, which stabilizes the flame by matching the flame speed with flow velocity.
- Swirl addition in the diffusion flame alters the flame shape significantly, thereby the flame shape can be adjusted to the geometry of the chamber.
- The recirculation region acts as a bluff body stabilizer that holds the flame from the base, thereby the blowout is postponed.
- Major applications: power plants, furnaces, gas turbine engines and chemical industries.
