Numerical Study On Suppressing Flame Propagation In The Pipe With Porous Materials

Aiming at the situation of explosive disaster of flammable gases, pipe safety attracted more and more attention. To investigate the flame suppression performance of porous materials in pipe, numerical simulation was carried out to study the variation of quenching distance and pressure wave in the porous materials. It Provide experimental and theoretical references for deflagration suppression. According to this point, the main work and conclusions in this paper are as follows:(1) Studied the nfluences of flame inlet velocity on quenching distance, and a positive correlation is between them. After going through porous medium, quenching is achieved as the flame energy declines because of the wall effect which can inhibit the spread of flame.(2) Studied the influence of porosity change on flame propagation. To some extent, the quenching distance is positively correlated to the porosity of porous material. The larger the porosity is, the weaker ability of flame inhibition it has, and vice versa. The pressure wave of the flame also forms a positive correlation with the porosity.(3) Through studying the relation between quenching distance and the medium activity in three different mixed flammable mediums, which are ethane-air, propane-air and methane-air, it is concluded that giving the same parameters, the quenching distance is positively correlated with the activity of the medium in different reaction mediums.(4)Studied the influence of porosity change on flame propagation. The quenching distance is positively correlated to the porosity of porous material in 0-80kPa. Studied the influence of porous materials on pressure.(5) Through studying the variation of the inlet velocity and pressure, studied the influence of explosive energy on quenching distance. The larger the initial energy is, the larger the quenching distance is, the quenching distance forms a logarithmic correlation with the explosive energy.(6) Studied the influences of porosity change of porous material on pressure value, the pressure is positively correlated to the porosity of porous material. The larger the porosity is, the weaker ability of flame inhibition it has.(7) Studied the influences of length change of porous material on pressure value, and the data analysis shows that the relation between the two is relating to the power, which has proved that the length change of porous material will take the maximum effect within certain length, and once exceeding the specific length, the influence gradually declines.(8) When the distance from the entrance increases, the flame pressure wave increases then decreases during the propagation in pipeline. Although the pressure wave increases with reaction rate increase, some would be absorbed by the porous materials, so the pressure wave decreases along the pipeline after wave peak...