Numerical simulation of the ECN spray a using multidimensional chemistry coordinate mapping: N-dodecane diesel combustion

Mehdi Jangi*, Gianluca D'Errico, Xue Song Bai, Tommaso Lucchini

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

A three dimensional numerical simulation of the ECN "Spray A" is presented. Both primary and secondary breakup of the spray are included. The fuel is n-Dodecane. The n-Dodecane kinetic mechanism is modeled using a skeletal mechanism that consists of 103 species and 370 reactions [9]. The kinetic mechanism is computationally heavy when coupled with three dimensional numerical simulations. Multidimensional chemistry coordinate mapping (CCM) approach is used to speedup the simulation. CCM involves two-way mapping between CFD cells and a discretized multidimensional thermodynamic space, the so called multidimensional chemistry coordinate space. In the text, the cells in the discretized multidimensional thermodynamic space are called zone to discriminate them from the CFD cells. In this way, the CFD cells which are at the similar thermodynamic state are identified and grouped into a unique zone. The stiff ODEs operates only on the zones containing at least one CFD cell. This zones are called "active zones". Several CFD cells may fall into a unique zone. Thereby, speedup in the stiff ODEs integration is expected. In simulation of the "Spray A", it is shown that the number of active zones is of the order of hundred times less than the total number of CFD cells. It is therefore a significant speedup in the simulation is expected. After the stiff ODEs integration the mean reaction rate computed in the zones are mapped back to the corresponding CFD cells. While the CCM approach significantly reduces the compositional time, the results are very promising. For example, the predicted spray penetration length, lift-off and the structure of the reaction zone agree well with the experimental measurements. The ignition delay time however was over-predicted. This may be attributed to the kinetic mechanism used in the simulation.

Original languageEnglish
Title of host publicationSAE 2012 International Powertrains, Fuels and Lubricants Meeting, FFL 2012
Volume9
DOIs
Publication statusPublished - 1 Dec 2012
EventSAE 2012 International Powertrains, Fuels and Lubricants Meeting, FFL 2012 - Malmo, Sweden
Duration: 18 Sept 201220 Sept 2012

Conference

ConferenceSAE 2012 International Powertrains, Fuels and Lubricants Meeting, FFL 2012
Country/TerritorySweden
CityMalmo
Period18/09/1220/09/12

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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