ENGINE AND SPRAY SIMULATIONS

Resumo

The strict pollutant and greenhouse gas legislation of recent decades has inspired a wide range of numerical works aimed at achieving reasonable emissions and specific fuel consumption rates for internal combustion engines that spans from studies of isolated phenomena like turbulent flows, fuel-sprays, and combustion to complete analyses, with different complexity levels of dimensionality, chemistry, and turbulence, of the full combustion chamber process. This paper is a compilation of numerical studies developed by our group and collaborators over the last two years including Large-eddy simulations (LES) of the Duisburg optical engine and fuel-spray simulations of the "Spray G" multi-hole gasoline injection test case provided by the Engine Combustion Network (ECN). First we investigate the effect of the top-land crevice volume on the performance of the combustion in port fuel injection spark ignition engines, taking the Duisburg engine as parameter. Then we outline "Spray G" simulations performed using Reynolds-Averaged Navier Stokes (RANS) and LES methodologies with a Lagrangian Particle Tracking (LPT) approach. For all cases the modeled results have been validated against experimental data, presented and discussed.