Predicting the ignition delay of turbulent methane jets using Conditional Source-term Estimation

Authors: Grout, R. W.¹; Bushe, W. Kendal²; Blair, C.³

Source: Combustion Theory and Modelling, Volume 11, Number 6, December 2007 , pp. 1009-1028(20)

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Abstract:

A predictive simulation of the autoignition process of non-premixed methane in a turbulent jet configuration was performed. Closure for the chemical source-term was obtained using Conditional Source-term Estimation with Laminar Flamelet Decomposition (CSE-LFD). The ambient oxidizer conditions - the high pressure and moderate temperatures characteristic of compression ignition engines - were chosen with the intent to validate the combustion model used under engine-relevant conditions. Validation was obtained by comparison of the predicted ignition delay to experimental results obtained from a shock-tube facility at several initial temperatures. Overall, the combination of full chemistry that has been carefully tuned to predict autoignition of premixed methane-air mixtures under similar temperature/pressure conditions with the CSE-LFD model is able to successfully predict the autoignition delay time of methane-air jets well within the scatter in the experimental data.

Keywords: Conditional moment closure; Conditional source-term estimation; Methane ignition; Turbulent combustion

Document Type: Research article

DOI: http://dx.doi.org/10.1080/13647830701330922

Affiliations: 1: Cambridge University Engineering Department, Cambridge, UK 2: Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada 3: Westport Innovations,

Publication date: 2007-12-01