A Regime Diagram for Autoignition of Homogeneous Reactant Mixtures with Turbulent Velocity and Temperature Fluctuations

Hong G. Im, Pinaki Pal, Margaret S. Wooldridge, Andrew B. Mansfield

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A theoretical scaling analysis is conducted to propose a diagram to predict weak and strong ignition regimes for a compositionally homogeneous reactant mixture with turbulent velocity and temperature fluctuations. The diagram provides guidance on expected ignition behavior based on the thermo-chemical properties of the mixture and the flow/scalar field conditions. The analysis is an extension of the original Zeldovich’s analysis by combining the turbulent flow and scalar characteristics in terms of the characteristic Damköhler and Reynolds numbers of the system, thereby providing unified and comprehensive understanding of the physical and chemical mechanisms controlling ignition characteristics. Estimated parameters for existing experimental measurements in a rapid compression facility show that the regime diagram predicts the observed ignition characteristics with good fidelity.
Original languageEnglish (US)
Pages (from-to)1263-1275
Number of pages13
JournalCombustion Science and Technology
Volume187
Issue number8
DOIs
StatePublished - Apr 2 2015

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