Influence of smooth temperature variation on hotspot ignition

Reinbacher, Fynn; Regele, Jonathan David

doi:10.1080/13647830.2017.1381347

Influence of smooth temperature variation on hotspot ignition

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · Combustion Theory and Modelling

DOI:https://doi.org/10.1080/13647830.2017.1381347· OSTI ID:1417170

Reinbacher, Fynn ^[1]; ^[1]

Iowa State Univ., Ames, IA (United States)

Autoignition in thermally stratified reactive mixtures originates in localised hotspots. The ignition behaviour is often characterised using linear temperature gradients and more recently constant temperature plateaus combined with temperature gradients. Acoustic timescale characterisation of plateau regions has been successfully used to characterise the type of mechanical disturbance that will be created from a plateau core ignition. This work combines linear temperature gradients with superelliptic cores in order to more accurately account for a local temperature maximum of finite size and the smooth temperature variation contained inside realistic hotspot centres. A one-step Arrhenius reaction is used to model a H₂–air reactive mixture. Using the superelliptic approach a range of behaviours for temperature distributions are investigated by varying the temperature profile between the gradient only and plateau and gradient bounding cases. Each superelliptic case is compared to a respective plateau and gradient case where simple acoustic timescale characterisation may be performed. It is shown that hot spots equivalent with excitation-to-acoustic timescale ratios sufficiently greater than unity exhibit behaviour very similar to a simple plateau-gradient model. Furthermore, for larger hot spots with timescale ratios sufficiently less than unity the reaction behaviour is highly dependent on the smooth temperature profile contained within the core region.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; Universities/Institutions

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1417170

Report Number(s):: LA-UR--17-28265

Journal Information:: Combustion Theory and Modelling, Journal Name: Combustion Theory and Modelling Journal Issue: 1 Vol. 22; ISSN 1364-7830

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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temperature gradient
thermal stratification

Influence of smooth temperature variation on hotspot ignition

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