Resumen

GUEVARA-MORALES, G.; HUERTA-CHAVEZ, O.  y  ARIAS-MONTANO, A.. Modelado computacional Reynolds-Averaged Navier-Stokes flamelets para el estudio del proceso de combustión turbulenta de sprays. Rev. mex. fis. [online]. 2020, vol.66, n.1, pp.56-68.  Epub 27-Nov-2020. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.66.56.

In this work, a 2D numerical technique using Computational Fluid Dynamics is applied to reproduce and analyze the process of turbulent combustion of sprays. The method used is the Reynolds-Averaged Navier-Stokes Equations, coupled with the steady-flamelets combustion model through a probability density function. The simulation of the combustion process is based on the experimental model developed by the National Institute of Standards and Technology and the experimental results reported by Widmann and Presser [16]. The velocity components obtained from the simulation are compared with the experimental results at 9.5 and 17.6 mm from the injection point in the axial direction. These results show close correspondences with the experimental data of the radial, axial and tangential velocity profiles across the combustion chamber in the range of 14 to 50 mm in the radial direction. In addition to the air velocity, the distribution, size, and speed of the fuel droplets are also compared, as well as the composition of the exhaust gases. According to the results, the difference in the distribution of drops over the spray dispersion angle affects the rest of the spray characteristics. The difference in the average diameter of Sauter suggests that the evaporation rate of the larger droplets is overestimated. Finally, it is confirmed that, given the assumption about the infinitely fast reaction rate, the combustion model predicts that combustion is practically complete, although there are droplets whose evaporation is achieved beyond the reaction zone.

Palabras llave : Combustion; computational fluid dynamics; spray.

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