摘要

We consider the computation of the flow and mixing generated by a single or multiple co-annular swirling jets. The geometry of the burner that produces the jets is typical for a gas turbine burner. We consider both single and multiple, interacting burners. In addition to studying the turbulent flow field, we also consider the turbulent mixing of a passive scalar, injected to emulate fuel injection. In all the studies we use Large Eddy Simulations, assuming isothermal and incompressible flow. The confinement of the jets leads to larger internal re-circulating zones as compared to the corresponding free jet. Co- and counter rotation of the flow in the burners affect largely the flow and the mixing process. In addition, new modes of flow instability can be observed when multiple' burners are considered.