Abstract
A theoretical prediction of ignition modes in shock tubes relevant to engine conditions is proposed and validated with a wide range of shock tube experiment data. The predictive Sankaran number, \(\mathrm{{Sa}_p}\), is adapted to distinguish between the weak and strong ignition modes. The non-ideal temperature and pressure rise inherently occurring in combustion devices is considered in the formulation of \(\mathrm{{Sa}_p}\). The \(\mathrm{{Sa}_p}\) criterion is then validated by the experimental data in shock tubes for a number of fuels exhibiting negative temperature coefficient (NTC) and non-NTC behavior. It is demonstrated that the \(\mathrm{{Sa}_p}\) criterion can accurately predict the weak and strong ignition modes regardless of the NTC and non-NTC fuels over a wide range of pressure and temperature. \(\mathrm{{Sa}_p}\) \(= 1\) serves as a reliable marker to delineate the boundary between the strong ignition (\(\mathrm{{Sa}_p}\) \(< 1\)) and weak ignition (\(\mathrm{{Sa}_p}\) \(> 1\)). As inspired by the newly-developed \(\mathrm{{Sa}_p}\) criterion in shock tube, it strongly suggests that the sensitivity of ignition delay variation in non-constant volume reactors such as the polytropic compression/expansion heating effect in an internal combustion engine and in a rapid compression machine (RCM) should be incorporated in evaluating an ignition criterion to better predict the ignition modes.
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This work was sponsored by King Abdullah University of Science and Technology and used the resources of the KAUST Supercomputing Laboratory.
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Luong, M.B., G. Im, H. (2022). Prediction of Ignition Modes in Shock Tubes Relevant to Engine Conditions. In: Kalghatgi, G., Agarwal, A.K., Leach, F., Senecal, K. (eds) Engines and Fuels for Future Transport. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-16-8717-4_15
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