Direct comparison of PDF and scalar dissipation rates between LEM simulations and experiments for turbulent, premixed methane air flames

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• 作者：H.P. Tsui ; ^a ; ^{hongtsui@alumni.ubc.ca" class="auth_mail" title="E-mail the corresponding author} ; ^{hongtsui@live.com" class="auth_mail" title="E-mail the corresponding author} ; M.M. Kamal^b ; S. Hochgreb^b ; W.K. Bushe^a
• 关键词：Probability density function ; Scalar dissipation rate ; Premixed combustion ; Methane ; Turbulent flame ; Linear-eddy model ; Cambridge swirl burner
• 刊名：Combustion and Flame
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：165
• 期：Complete
• 页码：208-222
• 全文大小：1216 K

文摘

We present a direct comparison between the predicted and measured probability density functions (PDF) of the reaction progress variable and conditioned values of the scalar dissipation rates (SDR) in premixed turbulent flames. The predictions are based on simulations of premixed flames using the linear-eddy model (LEM), parameterised by a wide range of integral length scales and turbulent Reynolds numbers. The experimental results are highly spatially resolved temperature and species data from the Cambridge–Sandia swirl burner. The LEM simulations display remarkable accuracy in capturing the features observed experimentally. Further, the results reveal that the LEM calculated PDF and SDR for premixed flames remain relatively steady under a variety of turbulent conditions, including variations in the integral length and turbulent Reynolds number. In general, it appears to be practical to use representative pseudo-turbulent PDF and SDR models for a range of turbulence intensities and length scales.