Swirl Jet and Crossflow Interaction at Low Velocity Ratios and Incompressible Flows

Swirl jets in crosflow are investigated experimentally and numerically. The main difference with non-swirl cases is an asymmetry of the dominant kidney vortex and a slight distortion of the jet trace downstream of the injection hole. Jet rotation, at relatively low swirl numbers (S=0.1-0.4) is investigated by a computational tool while the numerical results are analyzed by means of various post-processing procedures aiming to clarify and quantify the impact of jet swirl on the ballistic behavior of a jet in crossflow. In general, swirl introduces an asymmetry in the flow domain and prevents the penetration of the jet into the crossflow. The rotation of the jet results in an imparity of the two parts of the main kidney vortex which is no longer symmetric to the axial centerline plane. Higher swirl numbers destruct the dominant kidney shape vortex which is transformed into a comma shape vortex, rotating close to the wall.