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Direct Numerical Simulation of spray flame

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Required Education : Ecole d'ingénieur et/ou Master 2
Start date : 1 February 2017
Mission duration : 6 mois
Salary : 650,00 €/mois

Numerical simulation has become an essential tool for the development and design of aeronautical and automotive engines as well as other energy systems using combustion. One main difficulty today is to accurately model and simulate liquid fuel injection, spray flame structures being even more complex than gaseous flame structures. Indeed, they show both premixed and diffusion flame regions as well as isolated or group droplets combustion, which makes their modeling very complex (Figure 1).

 

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Figure 1: Large Eddy Simulation using and Euler-Lagrange approach of a n-heptane/air spray flame (F. Shum-Kivan et al. Proc. Comb. Inst. 2016).

The main objective is to apply the Direct Numerical Simulation (DNS) approach which resolves the whole range of turbulent scales for the gas phase, coupled to a Lagrangian approach for the fuel droplets to a counterflow spray flame academic configuration measured at EM2C (Ecole Centrale Paris) lab. The results of the simulation will be first compared to existing measurements, and then analysed to provide information about complex spray flame structure.

Description:

This work is part of the NEXTFLAME project (EM2C-CERFACS) supported by ANR and SAFRAN. The work will follow the steps below:

  • Bibliographic study on spray flames
  • Training on the AVBP code and especially on the Lagrangian solver, by setting up, simulation and anaylisis of existing test cases
  • Setting-up of the counterflow spray-flame configuration (Figure 2) and computation using A DNS Euler-Lagrange approach
  • Comparison with existing measurements and analysis of spray flame structure

 

NEXTFLAME_photo_flamme

Figure 2: Picture of the counterflow spray flame configuration measured at EM2C within the ANR project NEXTFLAME.

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