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The effect of porous flexible polyvinyl chloride (PVC) barriers on the kinetic properties of propane explosions is investigated based on fluid dynamics and combustion-related theory. Furthermore, using small-sized cylindrical pipes, separate experimental studies on propane deflagration are conducted with different types of flexible PVC barriers placed in the pipeline. The results show that when the conditions of the same nature as the obstacles appear at the outlet end of the pipeline and the blocking rate is low, the presence of porous flexible PVC barriers counteracts the effect of tail-end barriers on propane deflagration. In the tail-end opening experiment, the porous flexible PVC obstacle has a significant effect on the flame pattern passing through it but has a weaker effect on the flames before they pass through it. Furthermore, it only affects the degree of "fingertip" sharpening of finger-shaped flames; the fewer the number of holes in the obstacle, the higher the sharpness of the fingertip flame. The porous flexible PVC barriers can reduce the rate of flame propagation and creasing of propane deflagration. The porous flexible PVC barriers have a lifting effect on the overpressure of the blast and a delaying effect on the onset of peak overpressure; the larger the number of holes in the barrier, the stronger the delaying effect. [ABSTRACT FROM AUTHOR]