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Multi-Dimensional Spark Ignition Model with Distributed Energy Input and Integrated Circuit Model
Technical Paper
2021-01-0405
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
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English
Abstract
A multi-dimensional model of the spark ignition process for SI engines was developed as a user defined function (UDF) integrated into the commercial engine simulation software CONVERGE™ CFD. For the present research, the model simulated spark plasma development in an inert flow environment without combustion. The UT model results were then compared with experiments. The UT CONVERGE CFD-based model includes an electrical circuit sub-model that couples the primary and secondary sides of an inductive ignition system to predict arc voltage and current, from which the transient delivered electrical energy to the gap can be determined. Experimentally measured values of the arc resistance and spark plug calorimeter measurements of the efficiency of electrical to thermal energy conversion in the gap were used to determine the thermal energy delivered to the gas in the spark gap for different pressures and gap distances. A novel feature of the presented model is that the thermal energy delivered to the gap is distributed uniformly along the arc rather than at discrete points along the arc. This feature was found to greatly reduce the tendency of the arc to distort its shape and tangle itself in a non-physical way, as is the tendency when discrete energy input locations are used. It was found that the tangled distortion of the arc when using discrete energy input was due to perturbations along the arc caused by differential expansion of the gas along groups of adjacent mesh cells that either had energy input or did not. The distributed energy feature also gave arc temperature distributions that were more spatially uniform and had steeper temperature gradients, consistent with experimental arc images. Testing of the model included simulations of arc movement in the presence of a crossflow of nitrogen through the gap. These results were compared with experimental high-speed video images of arc movement for a spark plug of similar geometry and taken over a range of pressures and crossflow velocities in a high-pressure constant volume vessel. There was good agreement between the simulations and experimental images, including the observed off-axis movement of the arc in response to a recirculation zone developed downstream from the ground electrode (anode).
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Kim, K., Tambasco, C., Hall, M., Matthews, R. et al., "Multi-Dimensional Spark Ignition Model with Distributed Energy Input and Integrated Circuit Model," SAE Technical Paper 2021-01-0405, 2021, https://doi.org/10.4271/2021-01-0405.Data Sets - Support Documents
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