Investigation of the Livengood-Wu integral for modelling autoignition in a high-pressure bomb

Investigation of the Livengood-Wu integral for modelling autoignition in a high-pressure bomb

The reaction progress variable, which is widely used in premixed and diffusion combustion studies, comprises a set of pre-selected intermediate species to denote reaction progress. Progress towards autoignition can also be traced by the Livengood-Wu (LW) integral. Autoignition occurs when the LW int...

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Bibliographic Details
Published in:Combustion theory and modelling Vol. 20; no. 1; pp. 77 - 98
Main Authors: Hu, Zhixin, Somers, Bart L.M.T., Cracknell, Roger F., Bradley, Derek
Format: Journal Article
Language:English
Published: Taylor & Francis 02-01-2016
Subjects:
Autoignition
autoigntive speed
Combustion
Constants
flamelet generated manifolds
inhomogeneous autoignition
Integrals
Livengood > Wu
Mathematical models
Modelling
Sprays
Toluene
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Summary:The reaction progress variable, which is widely used in premixed and diffusion combustion studies, comprises a set of pre-selected intermediate species to denote reaction progress. Progress towards autoignition can also be traced by the Livengood-Wu (LW) integral. Autoignition occurs when the LW integral attains a value of unity. This concept is further explored by applying it to an inhomogeneous mixture scenario, to determine the time and place of autoignition occurrence. A semidetailed mechanism (137 species and 633 reactions) for n-heptane/iso-octane/toluene is used in this study. Two numerical schemes based on the LW integral are proposed and incorporated into a computational fluid dynamics platform, to model autoignition in a 3D configuration, when a spray is injected into a constant volume bomb under diesel engine conditions. Tabulated chemistry, a traditional method of modelling autoignition using information from pre-calculated igniting diffusion flames, is also used for comparison purposes. The associated predicted pressure profiles are compared with experimental measurements.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:1364-7830
1741-3559
DOI:10.1080/13647830.2015.1118159