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Simulation of the emission of nitrogen oxides in a semi-industrial burner

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Required Education : Master ou Engineering degree
Start date : 1 February 2020
Mission duration : 6 months
Deadline for applications : 31 January 2020
Salary : 650 euros / month

Context

Nitrogen oxides are one of the undesirable products of combustion, and many technical solutions are tested today to try to reduce them. A key element for the production of these pollutants is the maximum temperature reached in the combustion chamber. It is therefore necessary to find a compromise between combustion efficiency and control of the maximum temperature of the flue gases. Indeed the simplest technique to lower the temperature is to burn lean mixtures, but the reduced reaction intensity can compromise the performance of the chamber. Numerical simulation is proving to be of great help in understanding the dominant physical mechanisms and offering innovative solutions for low-NOx burners. In this context, the proposed work aims at validating the combustion and NOx production modeling in a representative laboratory configuration of an industrial system.

Proposed work

The objective is to carry out the LES (Large Eddy Simulation) of the KIAI configuration experimentally studied at CORIA. This configuration is representative of an aeronautical combustion chamber, including in particular a swirled injector. The simulation will be performed with the CERFACS AVBP code and the results will be compared to the measurements to evaluate the predictive capacity of the modeling approach. Finally, the influence of the thermal environment will be studied.

The work will be split in the following steps:

  • Bibliography, training in theoretical and numerical combustion, handling the code AVBP
  • Study and validation of the nitrogen oxidation chemistry on canonical flame cases
  • Implementation of the simulation : mesh, modeling parameters
  • Simulation and analysis of results, comparison with measurements
  • Impact of the thermal environment of the burner: coupling with the thermal radiation and sensitivity to wall heat losses.

Contacts

E. Riber (riber@cerfacs.fr)

B. Cuenot (cuenot@cerfacs.fr)