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Multi-Dimensional Spark Ignition Model with Distributed Energy Input and Integrated Circuit Model Univ of Texas-Austin
- Format:
- Book
- Conference/Event
- Author/Creator:
- Kim, Kyeongmin, author.
- Conference Name:
- SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- 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. The model simulated spark plasma development in an inert flow environment without combustion. The UT model results were compared with experiments and with companion simulations generated by a second commercial spark plasma simulation software, Vizspark by Esgee Technologies Incorporated, which includes coupling of the spark plasma event to a reacting flow in which early flame kernel development was examined. 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 delivered electrical energy to the gap can be determined. Experimental measurements of 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 for the arc to distort its shape and tangle itself in a non-physical way, as is the tendency when discrete energy input is 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 gas 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 set up downstream of the ground electrode (anode)
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-0405
- Access Restriction:
- Restricted for use by site license
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