D214 Vorticity Generation Mechanism by Baroclinic Torque and Buoyancy in a Density Boundary Region of Two-dimensional Combustion Field

The focus of this research is placed on spatio-temporal evolution of vorticity produced by baroclinic torque and buoyancy in a density boundary layer between burnt gas of two-dimensional premixed laminar flame and side air flow. PIV and discrete vortex simulation of Lagrangian transport element method are carried out. As a result, it is found that accumulated vorticity due to buoyancy in a density boundary layer leads to roll-up of large-scale vortical structure in downstream region. Then, it induces acceleration of a density boundary region through kinetic pressure, resulting in secondary generation of baroclinic torque.