Natural gas/diesel RCCI CFD simulations using multi-component fuel surrogates

Previous attempts to model natural gas/diesel reactivity controlled compression ignition (RCCI) engines using single fuel component chemical kinetics have demonstrated difficulties with reproducing the gradual increase in combustion rate observed experimentally. This study investigates whether employing a multi-component vaporisation and chemical kinetics model for diesel fuel can yield closer agreement with experimental combustion rates. Multi-dimensional CFD simulations are compared against an injection timing sweep from a GM 1.9 L diesel engine modified with port injected natural gas. Using the multi-component model for both diesel vaporisation and diesel chemical kinetics resulted in a closer match with experimental heat release rate than using single component diesel chemical kinetics. However, the overly fast combustion rates at ignition could not be completely eliminated. In addition, a parameter study revealed that the simulation results are strongly sensitive to the ratio of components in the diesel fuel surrogate, the injected mass, and the injection velocity.

Language

  • English

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  • Accession Number: 01638812
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 31 2017 8:58AM