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Reduced Order Model of Laminar Premixed Inverted Conical Flames

Abstract : An Inverted Conical Flame, anchored at a central bluff-body, in an unconfined burner configuration, is a flame that may be used to further understand more complex flame configurations, such as in aeronautical engines combustion chambers. This article involves the modeling of an unconfined laminar premixed ICF, anchored at a central cylindrical rod. The computational fluid dynamic modeling of this flame configuration involves the solution of transport equations of species mass, momentum and energy, which is computationally expensive. A skeletal methane/air chemical kinetic mechanism is used to capture a plethora of time and length scales. Reduced Order Models (ROM) have been shown to increase the computational efficiency of dynamical systems modeling. Accordingly, in this work a ROM of the steady ICF is developed, using the volume flow rate of the combustible mixture as input variable of the ROM, and the velocity components and the temperature fields as the output. The aim is to optimize the flame modeling computational time, thus paving the way to the reduced order modeling of acoustically excited, unstable, laminar premixed inverted conical flames. A model of the ICF has been developed with Fluent 2019 R2, and the analysis of a diversity of properties and species included in the combustion process has been made. Since a skeletal chemical kinetic model is used, the characterization of the flame is marked by its different property scales, allowing the flame front recognition over the field of CH2. However, this CFD model does not present a static convergence behavior, but oscillates over a pseudo-steady state point. Thus, an approximation of the statistical steady state has only been achieved by ensemble averaging the results. Therefore, the ROM of the ICF has been developed over a set of averaged data generated with Fluent, and its results shows agreement with CFD results, presenting an average overall error smaller than 3 %.
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Submitted on : Wednesday, December 2, 2020 - 5:23:26 PM
Last modification on : Friday, December 4, 2020 - 3:11:02 AM



Louise da Costa Ramos, Florent Di Meglio, Luis Fernando F. da Silva, Valery Morgenthaler. Reduced Order Model of Laminar Premixed Inverted Conical Flames. AIAA Scitech 2020 Forum, Jan 2020, Orlando, United States. ⟨10.2514/6.2020-0416⟩. ⟨hal-03036644⟩



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