Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 37, Issue 3, Pages 2927-2934Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.05.150
Keywords
Flamelet; Carrier-phase DNS; FPV; Turbulent mixing layer; Pulverized coal combustion
Funding
- German Research Foundation (DFG) [KR 3684/8-1, KE 1751/3-1, HA 4367/3-1]
- Federal Ministry of Economic Affairs and Energy (BMWi) of Germany [0327773J]
- Center for Computational Sciences and Simulation (CCSS) of the University of Duisburg-Essen on magnitUDE (DFG) at the Zentrum fur Informations- und Mediendienste (ZIM) [INST 20876/209-1 FUGG, INST 20876/243-1 FUGG]
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A steady flamelet/progress variable (FPV) approach for pulverized coal flames is employed to simulate coal particle burning in a turbulent shear and mixing layer. The configuration consists of a carrier-gas stream of air laden with coal particles that mixes with an oxidizer stream of hot products from lean combustion. Carrier-phase DNS (CP-DNS) are performed, where the turbulent flow field is fully resolved, whereas the coal is represented by Lagrangian point particles. CP-DNS with direct chemistry integration is performed first and provides state-of-the-art validation data for FPV modeling. In a second step the control variables for FPV are extracted from the CP-DNS and used to test if the tabulated manifold can correctly describe the reacting flow (a priori analysis). Finally a fully coupled a posteriori FPV simulation is performed, where only the FPV control variables are transported, and the chemical state is retrieved from the table and fed back to the flow solver. The a priori results show that the FPV approach is suitable for modeling the complex reacting multiphase flow considered here. The a posteriori data is similarly in good agreement with the reference CP-DNS, although stronger deviations than a priori can be observed. These discrepancies mainly appear in the upper flame (of the present DNS), where premixing and highly unsteady extinction and re-ignition effects play a role, which are difficult to capture by steady non-premixed FPV modeling. However, the present FPV model accurately captures the lower, more stable flame that burns in non-premixed mode. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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