Abstract
Nowadays hydrogen is gaining more and more attention by Industry, Academia and Politics. Being a carbon free fuel, it is supposed to have a key role in the future energy scenario, especially if produced by renewable sources. The use of mixtures of hydrogen and conventional hydrocarbons in gas turbines is one of the most promising technical solutions for obtaining a sustainable combustion during the transition toward a full decarbonization. For this reason, it is fundamental to investigate the behaviour of fuels enriched with hydrogen in combustion processes. In this work, a lab-scale swirled premixed burner has been investigated by means of a fully 3D URANS approach. Firstly, a numerical simulation with cold flow has been performed to validate the model against experimental data. Then, reactive flow simulations have been performed. Initially, a combustion with 100% methane was considered. Then, a 30% by volume hydrogen blending has been investigated. The partially premixed combustion model has been implemented to take into account the inhomogeneities of the mixture at the chamber inlet. The variation of the flame structure due to the hydrogen enrichment will be described in terms of the temperature and species concentration distributions.
Highlights
Nowadays the e↵ort by Industry, Academia and Politics towards a global decarbonization process is becoming more and more essential
Being a carbon free fuel, it is supposed to have a key role in the future energy scenario, especially if produced by renewable sources
The partially premixed combustion model has been implemented to take into account the inhomogeneities of the mixture at the chamber inlet
Summary
Nowadays the e↵ort by Industry, Academia and Politics towards a global decarbonization process is becoming more and more essential. The main advantages and disadvantages related to combustion with hydrogen are highlighted by carrying out a thermo-fluid dynamic study on a swirl-stabilized lean-premixed lab-scale burner This burner, both in the case of cold and hot flow, has been simulated by means of the commercial software ANSYS Fluent®. In the case of cold flow, two cases have been considered: in the first, only the flow of combustion air is simulated and an analysis of the flow fields and the characteristic period of the Precessing Vortex Core (PVC) is carried out; in the second case the fuel is introduced in order to investigate the mixing processes between the comburent and the fuel For this last analysis, two types of fuel composition are analyzed: injection of methane only (CH4) and injection of a mixture of methane enriched with hydrogen (H2) at 30%v (on volume basis). In the numerical analysis of the reacting system with both the combustion of methane and of the methane-hydrogen mixture, temperature and species concentration distributions inside the combustion chamber are considered
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