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The Study of Premixed Flame Propagating and Quenching in Narrow Channel

Author: HuChunMing
Tutor: YuJianLiang
School: Dalian University of Technology
Course: Safety Engineering and Technology
Keywords: Explosion suppression Quenching Premixed flame Wall temperature
CLC: X932
Type: Master's thesis
Year: 2006
Downloads: 159
Quote: 5
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Abstract


Widely used in modern industrial flame arrester to prevent combustible gas explosion disasters occur in the transport pipeline network to study the propagation of premixed combustible gas flame flame arrester unit is of great significance for the design and application of the flame arrester. In this paper, experimental and numerical simulation methods to study the quenching of premixed flame propagation in different slit spacing and the wall temperature flat slit structure, aimed at the design and application of the flame arrester and combustible gas combustion explosion prevention, reference. The experimental study of propane / air premixed flame flat slit structure quenching the flame propagation speed, the slit spacing quenching length relationship to provide reference data for numerical simulation work. Equations of two-dimensional theoretical model for simulation of unsteady premixed flame propagation in narrow channels and control the use of general-purpose CFD software Fluent grid independence analysis, and simulation of the different speed of propane / air, methane / air premixed flame propagation in different slit spacing and different two-dimensional wall temperature Tablet slit quenching, the quenching of the flame length under various conditions, and with the experimental data in this article experimental and literature contrast, more consistent results, and concluding on the basis of the analysis of a large number of simulation data premixed flame propagation in narrow channels and quenching of the law: the propagation of premixed flames in narrow channels variation of the temperature and the kind of component concentrations in the analysis found that the propagation of the flame in the slit with the quenching of the unstable process; studied the flame speed, the slit spacing and the wall temperature of the flame propagation and quenching, premixed flame under a variety of conditions in the narrow channels of the length of the quenching of the flame velocity, the greater the slit spacing, the higher the slit wall temperature, the greater the length of quenching, the flame the harder quenching and as the flame speed and the increase of the slit pitch, the rise of the wall temperature on the length of the quenching is increasingly evident; obtain the flame propagation velocity, the dimensionless relationship between the slit pitch, the wall temperature and the length of the quenching formula: (Lq) / G · (V_o) / V · (T_q) / (T_w) = C to find the length and impact of quenching quenching dimensionless constant factors C and made constant C nomogram by Find the different slit ask distance and constant wall temperature corresponding C values, can be easily calculated by the length of the quenching of the flame speed. The research premixed flame propagation in narrow channels the dimensionless relationship with the quenching of the law, the flame speed, slit spacing, wall temperature and quenching length and dimensionless number C nomogram for flame arresters Research design and engineering applications to provide a reference, of positive significance to improving the theory and explosion suppression technology popularization and application explosion suppression.

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CLC: > Environmental science, safety science > Safety Science > Safety Engineering > Explosion safety and fire and explosion
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