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CPOTE2022 logo
7th International Conference on
Contemporary Problems of Thermal Engineering
Hybrid event, Warsaw | 20-23 September 2022

Abstract CPOTE2022-1142-A

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Novel wet combustion chamber concept CFD studies with triple water inlet

Marcin FROISSART, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Poland
Tomasz OCHRYMIUK, Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Poland

Presented wet combustion chamber concept contains several integrated elements, which altogether form a prototype able to reduce extremely high oxy-combustion temperatures (up to 2800ᵒC) in an elevated pressure above 10 bars. To enable such capability, liquid water is supplied directly into the combustor flame zone. This is obtained with the front spray and water penetration through the two separate liner segments, which are made of the ceramic matrix composite (CMC) porous medium. This material was developed by the aerospace industry to take advantage of the ceramic heat resistance and low density while reducing the disadvantage of monolithic ceramic brittleness. Taking various interactions into account, analysed model couples rapid oxy-combustion process with the instant liquid water evaporation. Particularly important phenomena occurs at the surfaces of water droplets penetrating the flame with the axial velocity of 100 m/s. Rapid evaporation of each of them induce significant mixing force driven by the local thermal gradients. For the nominal case, 3D results were validated against the 0D calculations. While the nominal water mass split is 14% at the front plus 86% at the liner, other supply ratios were taken into account and are reported in the results section. Combustion process was modelled with GRI-Mech 3.0 mechanism.

Keywords: Wet combustion chamber, Ceramic matrix composite, Methane, Spray, Porous material
Acknowledgment: The research leading to this paper has received funding from the Norway Grants 2014–2021 via the National Centre for Research and Development in Poland. This paper has been prepared within the frame of the project: “Negative CO2 emission gas power plant”—NOR/POLNORCCS/NEGATIVE-CO2-PP/0009/2019–00 which is co-financed by program “Applied research” under the Norwegian Financial Mechanisms 2014–2021 POLNOR CCS 2019—Development of CO2 capture solutions integrated in power and industry processes.