Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 52 11 2019 03 20 Experimental Study of Premixed Methane-Air Flame Propagation in a Closed Duct with Porous Obstacle Experimental Study of Premixed Methane-Air Flame Propagation in a Closed Duct with Porous Obstacle 3225 3240 3347 10.22060/mej.2019.15261.6077 FA Habib Kolahdooz Shahrood Univ. of Tech. Mohammad Hasan Kayhani Shahrood Univ. Mohsen Nazari Reza Ebrahimi KNTU Journal Article 2018 11 07 The propagation and shape of methane-air premix flame in an enclosure with dimensions of 50 × 11 × 8 cm and the effect of the porous obstacle with a porosity percentage of 95 with 20 cavities per square inch in the flow path has been studied in a laboratory. The study of flame behavior has been done with high speed camera photography. The pressure variations inside the enclosure are recorded with the help of a pressure sensor and converter located on top of the enclosure. The range of pressure variations has been adapted to the reference samples and has been validated. The location of the porous obstacle has been tested for four different distances of 5, 10, 15 and 20 cm from the spark plug. The results for the four porous obstacle states indicate that the turbulence created in the flow field can change the location of formation of the tulip flame, as well as its formation time. For a distance of 20 cm the porous obstacle from the spark location, the turbulence of the flow field is at its maximum within 4 different distances, and the flame front is formed with a fundamental difference similar to the flame of the classic tulip flame.o, the greatest amount of pressure in the inner span of the wing and near the edge of the wing attack is observed. The propagation and shape of methane-air premix flame in an enclosure with dimensions of 50 × 11 × 8 cm and the effect of the porous obstacle with a porosity percentage of 95 with 20 cavities per square inch in the flow path has been studied in a laboratory. The study of flame behavior has been done with high speed camera photography. The pressure variations inside the enclosure are recorded with the help of a pressure sensor and converter located on top of the enclosure. The range of pressure variations has been adapted to the reference samples and has been validated. The location of the porous obstacle has been tested for four different distances of 5, 10, 15 and 20 cm from the spark plug. The results for the four porous obstacle states indicate that the turbulence created in the flow field can change the location of formation of the tulip flame, as well as its formation time. For a distance of 20 cm the porous obstacle from the spark location, the turbulence of the flow field is at its maximum within 4 different distances, and the flame front is formed with a fundamental difference similar to the flame of the classic tulip flame.o, the greatest amount of pressure in the inner span of the wing and near the edge of the wing attack is observed. https://mej.aut.ac.ir/article_3347_1a04f965818a8533f5613003c7db243d.pdf