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• W2922328033 abstract "The stochastic morphology of ceramic foams and discrepancies between specimens of the same type complicate the creation of numerical models during the design and optimization of porous medium burners. A favourable solution, from the modelling point of view, is the application of an ordered diamond lattice with definite geometry produced by means of additive manufacturing, which potentially allows achieving higher efficiencies and lower pollutant emissions. This document, describes procedures in the selection of diamond lattices with proper parameters and the comparison of the porous medium burner performances with different materials and geometries.The first section explains our methodology for geometrical analysis of ceramic foams and further selection of equivalent diamond lattices. Three acquired types of ceramic SiSiC foams (10 PPI, 30 PPI, and 60 PPI) were evaluated from image cross-sections and digital replicas that were obtained by means of X-ray computed tomography. Upon investigating, we found that pore sizes provided by a manufacturer were underestimated and discrepancies between them reached up to 100% for 60 PPI specimens. Combination of adapted cell size analysis according to ASTM D3576-15 standard and a developed tetrakaidecahedron model was favoured among other methods of pore size determination. After analysis of ceramic foams, an approach of selecting equivalent diamond lattices in terms of porosity and absolute permeability was proposed. As a result, three specimens were printed from CoCr alloy: 10 PPI and 60 PPI foams, as well as an equivalent 10 PPI diamond lattice. A test bench of the two-section porous medium burner was designed and assembled, which allowed the temperature, pollutant emissions and pressure drop measurements.The second section describes the experimental procedures and results from six different setups that compared the foam and diamond lattice geometries, and compared ceramic and metal as materials. In all setups, pollutant emissions were low and at the detection limit of the equipment, which agrees with theory and previous research. The application of CoCr material was determined as advantageous in the upstream section, ensuring higher flame stability and structural strength. A diamond lattice was found to be a good candidate for replacement of the foam geometry by providing both the predictability and higher structural stiffness. We recommend that further research should be done on using diamond lattice geometries with CoCr alloy in the upstream section, and SiSiC ceramic foam in the downstream section for the broad range of lean combustion regimes." @default.
• W2922328033 created "2019-03-22" @default.
• W2922328033 creator A5012369617 @default.
• W2922328033 date "2018-10-22" @default.
• W2922328033 modified "2023-09-27" @default.
• W2922328033 title "Design of porous medium burners by means of additive manufacturing" @default.
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