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Modelling of Spray Flames with Doubly Conditional Moment Closure.

Michael Philip Sitte1, Epaminondas Mastorakos1

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Summary
This summary is machine-generated.

This study simulates ethanol spray combustion using a Doubly Conditional Moment Closure (DCMC) model. The DCMC approach shows promising agreement with experimental data for pilot-stabilised flames.

Keywords:
Conditional moment closureEthanolPre-vaporisationSpray flames

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Area of Science:

  • Combustion Science
  • Chemical Engineering
  • Computational Fluid Dynamics

Background:

  • Spray combustion simulations require accurate modeling of complex phenomena like droplet evaporation and differential diffusion.
  • Existing models may not fully capture the interplay between turbulence, chemistry, and spray dynamics.

Purpose of the Study:

  • To derive and apply a Doubly Conditional Moment Closure (DCMC) model for simulating pilot-stabilised ethanol spray flames.
  • To assess the significance of various terms within the DCMC framework for spray combustion.

Main Methods:

  • Development of a DCMC equation incorporating droplet evaporation and differential diffusion using mixture fraction and reaction progress variable.
  • Implementation of closure sub-models for Favre-averaged spray terms.
  • Validation against experimental data for a pilot-stabilised ethanol spray flame.

Main Results:

  • The DCMC model successfully simulates the ethanol spray flame.
  • The study provides insights into the importance of different physical and chemical terms in the model.
  • Promising overall agreement between simulation results and experimental data was achieved.

Conclusions:

  • The DCMC model offers a viable approach for simulating ethanol spray combustion.
  • Further refinement of sub-models may improve accuracy and address discrepancies with experimental data.