Numerical and Experimental Study of a Jet-and-Recirculation Stabilized Low Calorific Combustor for a Hybrid Power Plant

Felix Grimm, Timo Lingstädt, Peter Kutne and Manfred Aigner
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Felix Grimm: German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Timo Lingstädt: German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Peter Kutne: German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Manfred Aigner: German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

Energies, 2021, vol. 14, issue 3, 1-19

Abstract: An atmospheric prototype burner is studied with numerical and experimental tools. The burner system is designed for operation in a hybrid power plant for decentralized energy conversion. In order to realize such a coupled system, a reliable combustion system has to be established. Numerical and experimental findings in the presented study demonstrate the capabilities of the novel burner system in suitable operation conditions. In this system, a solid oxide fuel cell (SOFC) is mounted upstream of the burner in the gas turbine system. The combination of both realizes a large operational flexibility with comparably high overall efficiency. Since the combustor is operated with SOFC off-gas, several challenges arise. Low calorific combustion needs careful burner design and numerical modeling, since the heat-loss mechanisms occur to be in the order of magnitude of thermal power output. Thus, different modeling strategies are discussed in the paper. The numerical studies are compared with experimental results and high-quality simulation results complement limited measured findings with easy-to-use low fidelity RANS models. A priori measurements are employed for the selection of investigation points. It is shown that the presented combustor system is able to cover low-calorific combustion over a large range of operation conditions, despite major heat-loss effects, which are characterized by means of numerical CFD (Computational Fluid Dynamics) modeling.

Keywords: jet-and-recirculation stabilized combustion; OH* measurements; numerical CFD analysis; RANS modeling; detailed chemistry schemes; heat-loss modeling; low-calorific combustion; syngas fuel (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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