73 Applications

An integrated numerical model has been developed for diesel engine computations based on the KIVA codes, as described by Kong etal. Han et a/.1219, Xin et a/.41, and Senecal et al.5*. The improved submodels include models for piston ring-pack crevice flow, wall heat transfer, spray, ignition, combustion, soot and NOx emissions, as described in the previous section, in the references, and in Table 7.1. The 'blob' injection and wave breakup model was used because it removes the need to specify an assumed initial drop size distribution at the nozzle. The drop drag submodel accounts for the effects of drop distortion and oscillation. The Shell multistep ignition kinetics model was used to simulate the low temperature chemistry during ignition delay period. The laminar-and-turbulent characteristic-time combustion model was used for modelling high temperature combustion. The extended Zeldovich mechanism was implemented for predicting NOx formation. The soot emission model used the formation model of Hiroyasu, and the NSC soot oxidation model.

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