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Item type:Publication, Extinction of hydrogen enriched methane and propane flames through perforated plates flame arrester elements with varying thickness(Elsevier BV, 2026-05-27)This study investigated the extinction of premixed flames involving methane, propane, hydrogen and air by using a flame arrester element composed of multiple perforated plates. Six stoichiometric mixtures were considered in the experiments, namely, [100%CH4]/air, [25%C3H8+75%H2]/5%He/air, [100%CH4]/10%He/air, [40%C3H8+60%H2]/10%He/air, [75%CH4+25%H2]/air and [10%C3H8+90%H2]/air. Helium was added to three of the mixtures to increase the thermal conductivity and produce different Lewis (Le = 0.72 to 1.36) and Zeldovich numbers (Ze = 4.98 to 8.45). Experiments were performed in a closed duct at 40 kPa and 295 K using flame arrester elements with varying thickness (δplates = 18 to 150 mm) and with orifice diameters of 1.0 and 2.0 mm. The mixtures and arrester configurations were tested at least three times, totaling 240 experiments. A one-dimensional heat-transfer model was also employed to strengthen the interpretation of the experimental observations. The results indicated that mixtures with similar Le and high Ze were successfully extinguished once a sufficiently thick perforated plates assembly was used.1