engleski

Numerical Analyses of Radiative Heat Transfer and Combustion Process by Using General Phase Reactions in a Jet Engine

In this research, the numerical analysis of a jet engine combustion process with the computational fluid dynamics software AVL FIRE™ is presented. It is known, that the gases inside the high-temperature combustion chamber of a jet engine participate in the heat transfer with three different physical phenomena: absorbing, emitting and scattering. The absorbing and emitting phenomena are predominant since the combustion of a jet fuel does not produce a significant amount of soot particles that are the main contributor to the scattering phenomenon. If the radiative participating gases physic is considered, the mean temperature will be decreased, thus the concentration of pollutant emissions will be also changed. Furthermore, the pollutant emission species will have an additional impact on the gas radiation. That is why the radiation heat transfer should be included to achieve more accurate results of emissions concentrations. The aim of this work is to present capable and frugal time-consuming procedures for modelling interactive combustion process and the radiation heat transfer inside a jet engine combustion chamber. In this research, the Euler Lagrangian discrete droplet method was utilised for the spray modelling, the radiation heat transfer was modelled with Discrete Transfer Radiative Method (DTRM) for radiative participating media, and the combustion process was described with general phase reactions. Finally, the results of temperature field, radiation heat source and emission concentrations inside the combustion chamber were verified.

Combustion, Radiation, Jet Engine, Emission Modelling

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