Prediction of Ignition Modes in Shock Tubes Relevant to Engine Conditions

Minh Bau Luong, Hong G. Im

Research output: Chapter in Book/Report/Conference proceedingChapter

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, 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 Sa p. The 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 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. Sa p = 1 serves as a reliable marker to delineate the boundary between the strong ignition (Sa p < 1 ) and weak ignition (Sa p > 1 ). As inspired by the newly-developed 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.
Original languageEnglish (US)
Title of host publicationEnergy, Environment, and Sustainability
PublisherSpringer Singapore
Pages369-393
Number of pages25
ISBN (Print)9789811687167
DOIs
StatePublished - Dec 14 2021

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