Numerical Investigation of the Effects of Spark Plug Orientation on Flame Kernel Growth 2019-01-0005
Spark ignition system is the most important component of the spark ignited (SI) engines that defines the combustion phasing. Details of the spark plug have dominant effects on the combustion process. In the present paper, effects of spark plug orientations on plasma arc, electrical discharging, flame kernel growth, and flame propagation were investigated using 3D combustion CFD. A new comprehensive ignition system model was used. It was shown that the tumble flow interacts with the spark plug and as a result different the spark plug orientation leads to different local flow structure near the spark plug. The flow interacts with the plasma arc that leads to different arc shape and arc length. The arc length in return changes resistance of air current path, and consequently changes the electrical discharging process. The arc shape changes the flame kernel’s shape and location, and its interaction with the electrodes, which consequently influences the flame propagation.
Haiwen Ge, Peng Zhao
Texas Tech. University, Oakland University
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