The Development and Application of a Diesel Ignition and Combustion Model for Multidimensional Engine Simulation 950278
An integrated numerical model has been developed for diesel engine computations based on the KIVA-II code. The model incorporates a modified RNG k-ε, turbulence model, a ‘wave’ breakup spray model, the Shell ignition model, the laminar-and-turbulent characteristic-time combustion model, a crevice flow model, a spray/wall impingement model that includes rebounding and breaking-up drops, and other improved submodels in the KIVA code. The model was validated and applied to model successfully different types of diesel engines under various operating conditions. These engines include a Caterpillar engine with different injection pressures at different injection timings, a small Tacom engine at different loads, and a Cummins engine modified by Sandia for optical experiments. Good levels of agreement in cylinder pressures and heat release rate data were obtained using the same computer model for all engine cases. Predictions of engine emissions were also performed and a good quantitative agreement between measured and predicted NOx and soot emission data were obtained with the use of the present modified RNG turbulence model. The results indicate that the predicted flow structures have an important impact on the prediction of NOx formation since it is very sensitive to the local temperatures in the combustion chamber.
Citation: Kong, S., Han, Z., and Reitz, R., "The Development and Application of a Diesel Ignition and Combustion Model for Multidimensional Engine Simulation," SAE Technical Paper 950278, 1995, https://doi.org/10.4271/950278. Download Citation
Song-Charng Kong, Zhiyu Han, Rolf D. Reitz
University of Wisconsin-Madison
International Congress & Exposition
Engine and Multidimensional Engine Modeling-SP-1101, SAE 1995 Transactions: Journal of Engines-V104-3