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A novel data-driven reduced order modelling methodology for simulation of humid blowout in wet combustion applications
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-9095-1605
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-1405-6078
Faculty of Mechanical Engineering and Transport Systems, Hermann-Föttinger Institute, Technische Universität Berlin, Berlin 106 23, Germany.
Faculty of Mechanical Engineering and Transport Systems, Hermann-Föttinger Institute, Technische Universität Berlin, Berlin 106 23, Germany.
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2024 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 297, article id 131310Article in journal (Refereed) Published
Abstract [en]

Computationally inexpensive reduced order models such as Chemical Reactor Networks (CRN) are encouraging tools to obtain fast numerical solutions. However, the accuracy of such models is usually compromised compared to experiments or high-fidelity numerical simulations. Therefore, continued improvement of such models is necessary to ensure reasonable accuracy and fill the need for computationally inexpensive tools. To that end, inputs from computational fluid dynamics simulations have been used to build CRNs in the last 25 years. This can be further improved by the application of data-driven techniques. The present work uses a novel data-driven analysis based on high-fidelity simulation results where the high-dimensional data is first reduced to a low-dimensional manifold and is then clustered into chemically coherent regions. These results along with the high-fidelity simulation results are used to construct a CRN for wet combustion simulations. Wet combustion is a novel clean combustion technique, where an increase in the level of steam dilution distributes the flame, with a risk for flame extinction. This phenomenon, i.e., humid blowout (HBO), was modelled using the above-mentioned CRN. The HBO predicted by the CRN was also tested for thermal power, equivalence ratio, and fuel conditions different from its design point. The error in HBO prediction was quantified by comparing the steam-dilution level at HBO obtained using CRN and that obtained experimentally. The CRN predicted the HBO with an error magnitude less than 5% when the thermal power was unchanged. The maximum error in all tested conditions was 16.65%. Furthermore, a sensitivity analysis revealed that the inclusion of hot gas recirculation through the central recirculation zone, quantified by the mass flow split between the post-flame region and the CRZ, is important in the prediction of HBO, although its accuracy is inconsequential.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 297, article id 131310
Keywords [en]
Chemical reactor network, Data-driven techniques, Humid blowout prediction, Reduced-order modelling (ROM), Wet combustion
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-346173DOI: 10.1016/j.energy.2024.131310ISI: 001234291300001Scopus ID: 2-s2.0-85190806621OAI: oai:DiVA.org:kth-346173DiVA, id: diva2:1855958
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QC 20240506

Available from: 2024-05-03 Created: 2024-05-03 Last updated: 2024-06-14Bibliographically approved

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Palulli, RahulZhang, KaiDuwig, Christophe

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