Effect Of Al-Mg Alloy Mesh Material On Flame Propagation Of Combustible Gas Explosion In Pipeline

Mesh aluminum alloy explosion suppression material is a honeycomb shaped explosion suppression product made of special aluminum alloy by special processing.The explosion accident can be effectively prevented by loading this material into the flammable explosive gas(liquid)body storage and transportation container according to the specified density of the material and by the means of loading the material into the flammable and explosive gas(liquid)body storage and transportation container.This material has great application prospects in the fields of fuel tank,oil tank,flammable and explosive liquid gas storage and transportation in military vehicles,aircraft and civil vehicles.Many scholars at home and abroad have done a lot of research on the methods and techniques of metal reticulated materials to restrain the propagation of explosion flame.However,up to now,the research of metal mesh materials on pipeline premixed gas mainly focuses on the macro-parameters such as explosion pressure and temperature,which is limited by experimental device design and observation technology.There are few detailed records and analyses of the transient interactions between the explosive flame and the reticulated material.For this purpose,the effects of Al-Mg alloy mesh materials on flame propagation and micro-morphology of Al-Mg alloy were studied by means of high-speed camera and schlieren technique.It provides experimental research and theoretical basis for accurately describing the suppression principle of the material.It provides experimental and theoretical support for the use of this material in production and life.The main contents and conclusions of this paper are as follows:(1)A set of small-sized gas explosion pressure relief experimental pipeline is designed,which can be used to capture the dynamic flame course by high-speed camera system.By using the explosion-venting system,ignition device and gas distribution system,high-frequency dynamic pressure sensor and data acquisition and control system to build the experimental platform of multivariate gas explosion pressure venting.(2)The pressure sensor was used to monitor the pressure change in the pipeline during the experiment,the flame propagation process was recorded by high-speed camera,and the change rule of flame propagation velocity was obtained by using the image data recorded by the sensor.The transient process of the interaction between the filling material and the flame and the microstructure of the flame are recorded by the high-speed camera schlieren system.(3)Comprehensive analysis of pressure data and monitoring images shows that there are two effects of Al-mg alloy mesh materials on flame propagation of mixed gases: turbulence promotion and cooling suppression.When the filling density is not high enough,there are two kinds of effects on the flame propagation of mixed gases: turbulence promotion and cooling suppression.The cooling inhibition did not play an inhibitory role,on the contrary,the flame propagation speed was accelerated by turbulence promotion.With the increase of filling density,the cooling inhibition gradually occupied the dominant role,so that the inhibition effect can be reflected.(4)Through the analysis of the image data taken by high-speed camera,the Almg alloy mesh material has a significant effect on the flame propagation process.After the filling density reaches a certain extent,the flame characteristic of tulip disappears.(5)By analyzing the image data of high-speed imaging schlieren system,the effect of Al-mg alloy mesh material on flame structure is significant.After passing through the filled area,the flame changes from laminar state to turbulent state,and the whole continuous front becomes broken.After the flame passes through the filled area,an obvious mass of fire appears,wrapped under turbulence by the noncombustible gas component of the mixed gas,and the heat is not replenished to lose the thermal equilibrium and extinguished,thereby attenuating the propagation of the flame.It is another embodiment of the inhibitory effect of the material;And with the increase of filling density,the quantity of fire mass increases,and the volume of individual fire mass decreases.(6)Compared with the experimental data of methane / hydrogen / air mixture and methane-air mixture,the flame propagation speed is accelerated when hydrogen is added to the mixture gas,and the turbulence degree is greater when passing through the filled area.The reticulated Al-mg alloy shows that the filling density required for the inhibition is greater and the inhibition is more difficult.