ABSTRACT
The use of the gas microturbines has been a promising alternative energy to assist the crescent demand of regional energy in Brazil, where more than 10 % of electrical energy is from thermoelectrical system and, besides, there are some programs of environmental regulation in energy, that detach the control of the emission of the pollutant agents of the types NOx, SOx and CO. In spite of these has been operated with fuels of low calorific power, there are limitations as for the instability of the fire; to the inflammability limits; to the nature of the fire; to the high taxes of emission of pollutants, during the combustion process. Any that are these limits, the aerodynamic study of the chambers is relevant in the measure that the formation of areas where there is recirculation, for instance, has strong influence in the time of residence and in the efficiency of the combustion. In spite of the progress in the development of mathematical models more and more sophisticated, to simulate the behavior of combustion in gas turbines, there isn’t a specific application for the combustion chambers of the annular type, only of the types tubular or cylindrical for great gas turbines. The present work accomplishes a comparative analysis among the different models of flows with the purpose of the best models that describe the aerodynamic behavior for combustion chambers of the annular type, using the tool computational CFX v 5.7 ®.
