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Flamelet-Tabulation in the Context of Simulation of Pulverized Coal Combustion

Knappstein, R. and Kuenne, G. and Sadiki, A. and Janicka, J. (2017):
Flamelet-Tabulation in the Context of Simulation of Pulverized Coal Combustion.
In: VDI Energie & Umwelt 2017 – 28 Deutscher Flammentag, Darmstadt, In: 28th Conference on German Flame Day Combustion and Fire, [Conference or Workshop Item]

Abstract

In this work a Flamelet Generated Manifold (FGM) modeling approach for pulverized coal combustion is presented in which premixed flamelets get tabulated in dependence of only a few control variables. Within this method, the main steps of the coal conversion process being volatiles combustion and char burnout as well as non-adiabatic physics and infinite rate chemistry effects are taken into account. This approach is suited for the application in Large Eddy Simulation (LES) of realistic pulverized coal combustion configurations. First, the physics and the resultant requirements in defining the table control variable get depicted. During char burnout, oxygen from the close proximity of the particle gets consumed which has to be considered in the model formulation under maintaining mass, energy and species balances. Second, the tabulation concept is outlined. Thereby, the choice of control variables as well as numerical aspects are discussed. Regarding the latter, the focus lies on the nonequidistant table structure in combination with a quick non-searching table access. Finally, the approach presented is verified with emphasis on consistency in terms of mass and species balance.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Knappstein, R. and Kuenne, G. and Sadiki, A. and Janicka, J.
Title: Flamelet-Tabulation in the Context of Simulation of Pulverized Coal Combustion
Language: English
Abstract:

In this work a Flamelet Generated Manifold (FGM) modeling approach for pulverized coal combustion is presented in which premixed flamelets get tabulated in dependence of only a few control variables. Within this method, the main steps of the coal conversion process being volatiles combustion and char burnout as well as non-adiabatic physics and infinite rate chemistry effects are taken into account. This approach is suited for the application in Large Eddy Simulation (LES) of realistic pulverized coal combustion configurations. First, the physics and the resultant requirements in defining the table control variable get depicted. During char burnout, oxygen from the close proximity of the particle gets consumed which has to be considered in the model formulation under maintaining mass, energy and species balances. Second, the tabulation concept is outlined. Thereby, the choice of control variables as well as numerical aspects are discussed. Regarding the latter, the focus lies on the nonequidistant table structure in combination with a quick non-searching table access. Finally, the approach presented is verified with emphasis on consistency in terms of mass and species balance.

Title of Book: VDI Energie & Umwelt 2017 – 28 Deutscher Flammentag
Series Name: 28th Conference on German Flame Day Combustion and Fire
Place of Publication: Darmstadt
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Energy and Power Plant Technology (EKT)
Date Deposited: 27 Mar 2019 06:23
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