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• W2358687294 abstract "The present paper is aimed to experimentally probe into the features of the premixed flame propagation mechanism in the initial stage of the binary fuel consisting of hydrogen/propane-air mixture. All the said experiments have been conducted in an obstructed square channel with a cross-section of 40 mm in width and 40 mm in height and a 3 000 mm in length in normal pressure and temperature. At the same time, we have arranged seven instrument ports on the channel surface and seven piezoelectric pressure transducers. In addition, we have adopted a series of perforated obstacles with the blockage ratio B.R= 0.5, a pitch equal to the channelwidth, the 31 mm diameter centrally round hole and a length of 1.5 m to speed up the flame propagation. To make sure the safety of the experimental facilities,we have made the equivalence ratio of the mixture and hydrogen molar fraction in the binary fuel of hydrogen/propane 1.1 and 0.8, respectively. In proceedingwith our research,we have carefully examined the mixtures in advance with the method of the partial pressure and then ignited them via an automotive spark plug at about 15-mJ discharge energy. As the result, we have achieved the pressure-time records of the flame propagationwith the pressure transducer. Furthermore, we have resorted to the schlieren technique via a high-speed digital camera to check the variations of the flame front structure and record the time-of-arrival of flame frontin the channel's horizontal axis,which helps to deduce the flame propagation velocity accordingly. The results of our investigation and experiments demonstrate that it is possible to obtain the flame propagation velocity which augments initially, arrives at the maximal value in a distance of 80 cm from the ignition point and finally reduces gradually in the limited measuring range. As for the schlieren technique,we have found that the flame propagation velocity can be measured by the camera with the gradual increase in the visualized domain of 0-300 mm from the ignition point. In addition,we have taken into full account the flame front surface area augmentation, the combustion product expansion and the retarded combustion between the two adjacent obstacles from the point of view of the physical mechanisms of the flame propagation in the initial stage. And, last of all, the observed oscillations of the flame front velocity should be attributed to the flame penetrating the contraction-expansion flow structure formed in each obstacle ahead of the flame front. Thus, it can be seen that our conclusion is qualified enough to provide the reference to the basic research on the physical mechanisms of the flame propagation of the premixed hydrogen/air mixtures." @default.
• W2358687294 created "2016-06-24" @default.
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• W2358687294 date "2014-01-01" @default.
• W2358687294 modified "2023-09-28" @default.
• W2358687294 title "Experimental study on the physical mechanism of the premixed flame propagation in the case of an obstructed channel" @default.
• W2358687294 hasPublicationYear "2014" @default.
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