United States Department of Transportation
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Distributed Heat Release Effects on Entropy Generation by Premixed, Laminar Flames
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2023-04-01
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[PDF-1.40 MB]
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Abstract:This article studies the generation of entropy disturbances by laminar premixed flames. The total entropy generation equals the integrated ratio of the local heat release rate and the local temperature, namely, ∫(q˙/T)dV . Due to this path dependency, evaluating this integral requires an understanding of how the heat release is distributed in the temperature space. Several studies evaluate the local entropy generation as (∫q˙dV)/Tb , where Tb refers to the burned gas temperature, implicitly assuming all the heat release occurs at Tb . Such an approximation is motivated by the high activation energy nature of combustion chemistry. This work evaluates this assumption by comparing it to results from one-dimensional premixed flame calculations for hydrogen, methane, and propane-air flames over a range of pressures, equivalence ratios, and preheat temperatures, quantified via the ratio κ .
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Content Notes:This is an open access article published under the Sage Green Open Access policy: https://us.sagepub.com/en-us/nam/posting-to-an-institutional-repository-green-open-access. Please cite this article as: Laksana A, Patki P, John T, Acharya V, Lieuwen T. Distributed heat release effects on entropy generation by premixed, laminar flames. International Journal of Spray and Combustion Dynamics. 2023;0(0). https://doi.org/10.1177/17568277231172887
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