Análise numérica computacional do fluxo de ar em uma câmara de combustão de microtubina a gás

Abstract

Nowadays the search for increasingly efficient technologies is growing, so the study of the aerodynamic behavior of a combustion chamber is very important. Especially during its development phase to obtain a final product of high quality. To study the flow of air inside a combustion chamber, has a goal, to get a combustor with a good dynamic behavior. Inside it the combustion of gases and the distribution of temperature and of the air carry on as efficient way. In this work, the ANSYS FLUENT® program has been used like a CFD tool to simulate the behavior of an annular combustion chamber with reverse flow. Supplementary programs such as ANSYS Design Modeler, ANSYS Meshing and ANSYS CFD-Post were used through CAD import software. So, we can show a how is made the generation, treatment and 3D visualization of the results. A comparison was made between the analytical method and the numerical method developed for the simulation. The simulations were performed in situations where the combustion chamber was working at 48.000, 64.000 and 77.000 rpm. All the mentioned simulations have allowed to draw conclusions that have validated the analytical method. We got the next conclusion that the mass flow remained constant from this to the entrance of the combustion chamber until its exit, so, the percentage of mass flow remained very close to the values found by the analytical method, on the other hand, the distribution of the flow through the holes of the combustion zones occurred in a variable and not constant manner as had been forecasted by the analytical method. Therefore, has been possible to check the recirculation region, or region of the magic circle inside the combustion chamber.