Investigation of Influence of Solid Obstacle on Methane-Air Flame Propagation in TubeReport as inadecuate




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Based on square transparent experimental tube with 1.5m long, photoelectrical transducer, pressuretransducer and high-speed video camera was used to set up optical and pressure signal testing system. Theobstacles are of 4 types i.e. plates, triple prisms, cuboids and cylinders and three kinds of blockage ratios i.e.20%, 40% and 60%. The results in the experiment show that: 1 plates and triple prisms increase flamespeed and overpressure much larger, and cuboids are intermediate, while effects of cylinders are comparativelylimited. 2 The obstacles can remarkably accelerate the flame velocity and pressure, and the irregularitiesof their surface are the main factor contributing to the flame turbulence. 3 There is a small difference inthe initial stage of flame acceleration, and the flame speed and overpressure are increased obviously when theflame comes across the obstacles. The research has some effect on preventing and controlling explosion disasterof methane in mine and other combustible gases in pipelines.

KEYWORDS

solid obstacle; flame propagation; gas explosion; high-speed video camera; tube

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Author: Ziru Guo, Quan Wang, Yibin Ding

Source: http://www.scirp.org/



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