The paper begins with a statement of the equation for the join PDF for gaseous mixture variables when vaporizing droplets are viewed as point sources. Then, the modified micromixing model that involves evaporation process is described. Monte Carlo modeling of joint PDF is performed alongside with KIVA II computations. Set of numerical calculations have been carried and compared with experimental visualizations of auto-ignition in the spray injected from the single nozzle hole into high pressure combustion chamber. Starting conditions are from experiments and involved the different quantity of injected fuel. Hot ignition was defined when the mean local temperature exceeded 107 K/s. At this moment the field of mean and variance of scalars in the mixture, as well as the spatial probability distribution of ignited statistical particles are computed. The last one is identified in the paper as a probability distribution of self-ignition sites. Numerical results represented qualitatively the features observed in the experiment. Ignition delays were predicted in agreement with experimental data.
Modeling of auto-ignition in diesel sprays using pdf approach
1999
Aufsatz (Konferenz)
Englisch
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