variavel0=<b>TAKEO JONAS FUDIHARA</b> - takeo@fem.unicamp.br UNICAMP
<b>LEONARDO GOLDSTEIN JR.</b> - leonardo@fem.unicamp.br UNICAMP
<b>MILTON MORI</b> - mori@feq.unicamp.br UNICAMP
<b>Abstract.</b> A study of the aerodynamics of a movable block swirl burner was performed by the computational fluid-dynamics techniques. This burner is characterised by the ability to adjust continuously the swirl number, by means of the simultaneous rotation of the eight movable blocks, intercalated between the eight fixed blocks. The swirl is obtained by the canalization of the air flux by the oblique breaches existing between a fixed and a movable block. The continuity and momentum equations were solved by the finite volume method. The three-dimensional grids, constructed by the multi-block technique, represent the eight oblique inlets and/or the eight normal inlets, intercalated between the first, used to inject the air, and the cylindrical concentric duct which is used to inject the combustible. The swirl number, evaluated by the simulations, was compared with the predicted by the analytical correlation and the experimental data of the burner presented by the IFRF (International Flame Research Foundation). The k-E and RNG k-E turbulence model were compared, and the last showed the central recirculation flux.The swirl number presented a severe decaying in the annular passage.
<b>Keywords.</b> burner, swirling flows, computational fluid dynamics, turbulence models, finite volume.