This paper discusses experimental and simulation results that describe the ignition behavior of advanced low pilot-ignited natural gas (ALPING) combustion. A multi-zone phenomenological model was developed to model ALPING combustion. Two separate models were used to simulate ignition of the diesel spray under ALPING combustion conditions: (a) Arrhenius-type ignition delay models, and (b) Shell autoignition model (a generic ignition mechanism for hydrocarbon fuels). The effect of different engine operating variables (pilot injection timings and intake manifold temperatures) on ignition processes are analyzed from experimental measurements and model predictions. The Shell autoignition model predicted ignition better over the range of injection timings compared to the Arrhenius-type ignition delay models. The sensitivity of the onset of ignition to important ignition model parameters is examined.
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