Abstract
A new phenomenological model, the TP (Temperature Phase) model, is presented to carry out optimization calculations for turbulent diffusion combustion in a high-pressure common rail diesel engine. Temperature is the most important parameter in the TP model, which includes two parts: an auto-ignition and a soot model. In the auto-ignition phase, different reaction mechanisms are built for different zones. For the soot model, different methods are used for different temperatures. The TP model is then implemented in KIVA code instead of original model to carry out optimization. The results of cylinder pressures, the corresponding heat release rates, and soot with variation of injection time, variation of rail pressure and variation of speed among TP model, KIVA standard model and experimental data are analyzed. The results indicate that the TP model can carry out optimization and CFD (computational fluid dynamics) and can be a useful tool to study turbulent diffusion combustion.
Highlights
Today’s strict emission level legislation limiting combustion-generated pollutants sets high demands on the development of cleaner engines
The soot model used in the calculations relies on a detailed description of the chemical processes leading from the fuel molecules to complex soot particles based on the statistical momentum approach
We have found that appropriate values for the effective activation temperature are below 5000 K, we assign a value of 1500 K for this parameter in the present study because it provides reasonable predictions compared with the available experimental data, especially for the short time available for soot formation immediately after ignition
Summary
Today’s strict emission level legislation limiting combustion-generated pollutants sets high demands on the development of cleaner engines. Calculations of soot formation and oxidation in diesel engines can mainly be classified into different model approaches. A full description of the chemical processes as well as soot and NOx formation can be obtained without having to simplify the fluid dynamics. The latter approach is the most detailed, but time consuming, and might be more difficult to incorporate into existing CFD code. The research presented focuses on obtaining an understanding of the ignition phase and soot model in a real high pressure common rail diesel engine through numerical simulations. In order to assess the performance of the matching results in terms of predicting cylinder pressure and heat release over a wide range of part-load conditions, an extensive parameter study varying injection timing and rail pressure has been conducted
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