Experimental device for hydrogen detonation inhibition using porous materials
[Objective]Owing to its special properties,such as low ignition energy and wide combustion range,hydrogen easily causes explosion accidents in manufacturing,transportation,and use.The detonation wave has a large propagation distance,rapid pressure growth,and great destructive power.In recent years,the inhibition effect of porous materials on explosion has received considerable attention.Herein,the inhibition effect of porous materials on detonation wave propagation in a pipeline is investigated,effectively reducing the harmful consequences caused by hydrogen explosion accidents.[Methods]To investigate the quantitative suppression effect of the material and structure characteristics of porous materials on detonation,a premixed gas detonation experiment system was set up,comprising a detonation pipeline system,a filling and distributing system,an ignition system,and a data acquisition system.Before the experiment,a premixed gas of 2H2+O2+3Ar was configured using the filling and distribution system.During the experiment,the pipeline was first evacuated,and then the premixed gas was filled.The initial pressure of the gas was controlled through the control panel,and the premixed gas in the pipeline was ignited under high pressure using the ignition system to form detonation.The propagation velocity and peak pressure of the detonation wave were recorded using the data acquisition system,and the three-point trajectory of the detonation wave was recorded using a smoke film laid on the side wall of the pipeline.Al2O3 foam ceramics with different pore densities of 10,20,and 40 ppi were selected to conduct experimental research on the detonation mechanism of 2H2+O2+3Ar premixed gas with Al2O3 foam ceramic materials with different pore densities in the pipeline.The effects of the initial pressure,porosity of porous materials,and other parameters on the hydrogen detonation propagation mechanism were considered.The effect of pore density and material properties on the propagation velocity and cell structure of the detonation wave was analyzed,and the law of the inhibition effect of porous materials on detonation was obtained.[Results]This study found that when the pore density of Al2O3 foam ceramics continues to increase,the pores become small,the free radicals involved in the chemical reaction are greatly reduced,resulting in a chain reaction that cannot be conducted,the leading shock wave is decoupled from the chemical reaction zone,and the detonation wave disappears.Finally,the experimental platform of premixed gas broadens the initial conditions of the traditional experimental pipeline,and a transverse and longitudinal wave structure measurement method is proposed,which is helpful to quantitatively reflect the three-dimensional structure of detonation waves at different cross sections.When the initial pressures are 10 and 15 kPa,the detonation wave propagation velocity is above 90%vCJ,the velocity fluctuation range is small,and the detonation wave is stable and self-sustaining propagation in the pipeline.[Conclusions]Porous materials can inhibit the propagation velocity of 2H2+O2+3Ar premixed gas detonation waves.When porous materials are installed in smooth pipes,the detonation wave velocity considerably decreases.When the pore density of Al2O3 foam ceramics increases,the propagation velocity loss of the detonation waves increases.
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