Predicting the ignition delay of turbulent methane jets using Conditional Source-term Estimation |
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Authors: | R W Grout W Kendal Bushe C Blair |
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Institution: | 1. Cambridge University Engineering Department , Trumpington Street, Cambridge, CB2 1PZ, UK;2. Department of Mechanical Engineering , University of British Columbia , 6250 Applied Science Lane, Vancouver, BC, Canada , V6T 1Z4;3. Westport Innovations , |
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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. |
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Keywords: | Conditional moment closure Conditional source-term estimation Methane ignition Turbulent combustion |
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