  Breakup of a liquid jet in a high speed gaseous crossflow finds wide range of
engineering and technological applications, especially in the combustors of the
gas turbine engines in aerospace industry. In this study, we present
volume-of-fluid method based direct numerical simulations of a liquid jet
injected into a swirling crossflow of gas. The liquid is injected radially
outwards from a central tube to a confined annular space with a swirling gas
crossflow. The essential features of the jet breakup involving jet flattening,
surface waves and stripping of droplets from the edges of the jet are captured
in the simulations. We discuss the effect of swirl on the spray characteristics
such as jet trajectory, column breakup-length, and size, shape-factor and
velocity distribution of the drops. Drop size increases with swirl and
penetration is slightly reduced. Moreover, the trajectory follows an angle
(azimuthal) that is smaller than the geometric angle of the swirl at the inlet.
Interestingly, we also observe coalescence events downstream of the jet that
affect the final droplet size distribution for the geometry considered in this
study.
