without staged air addition as RQL combustors. The favorable conditions to NOx reduction are achieved by the flow dynamic control of reactants and burned gases inside the chamber. The combustion takes place in two stages, each one in a separate chamber. At first stage the fuel is injected through a central spear and the total air of the combustion process crosses a swirler, acquire a tangential component of velocity. At the end of this primary zone, which is called transition zone, there is a sudden increase in the chamber diameter and the rotating air flow loses the wall effect, expanding itself radially. This causes the pressure decrease in the central region, which in turn allows the reversal of the air flow and consequently the creation of an intense recirculation zone mixing the remaining air with the combustion products of the primary zone. So that in the secondary chamber a lean pre-mixed flame is established. It is clear that the success to control NOx emissions depends on the main controlling parameters of the flow dynamic into the combustor, which are: the swirler blades angle, the fuel jet Reynolds number and the global equivalence ratio. Thus, the present paper regards to the influence of these main controlling parameters of the flow dynamic on NOx, besides CO and UHC emissions.