A Comparison of Numerical Results for an Optically Accessible HSDI Diesel Engine with Experimental Data
نویسندگان
چکیده
Comparisons between numerical results and experimental data for a homogeneous charge compression ignition (HCCI) engine with optical accessibility are being presented in this paper. The KIVA – 3V program, a general purpose combustion routine, is being enhanced by implementing the optimized Shell model for the ignition process, applying the extended Zeldovich formulation for nitrogen oxide formation consideration. Soot formation and oxidation models are also included to better describe the soot emission characteristics. The numerical model was then used to simulate the DIATA engine operating at different conditions. Spray cones, pressure and heat release calculations and combustion luminescence images, the KIVA outputs were then compared to experimental data. By examining the results generated by KIVA, it was shown that the numerical scheme accurately predict the spray characteristic, combustion luminescence and also the pressure and heat release rate. Soot was found to be concentrated along the outer edge of the piston bowl. Inefficient oxidation of soot was due to the incapability of the fluid to move the soot to regions with high oxygen concentration, where the species could readily be oxidized. Nitrogen oxide was seen to be produced in regions with high local temperature.
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