管道内金属丝网对丙烯/空气预混火焰的影响机制研究OA

Propylene is a pivotal raw material in the modern chemical industry and plays a crucial role in the organic synthesis industry.In recent years,the increasing adoption of electric heating to meet the demands of green high-temperature processes introduces risks such as electric sparks,which can easily trigger fire and ex-plosion accidents.While metal wire mesh is a common flame arresting device,its specific impact mechanism on propylene flames remains underexplored.Experiments were conducted using a high-precision flame structure ex-perimental platform equipped with high-speed cameras and pressure sensors.The study investigated the mor-phology,propagation velocity,and overpressure characteristics of propylene/air premixed flames within a duct under the influence of metal wire mesh.The mechanism of flame-mesh interaction was subsequently analyzed.The results indicated that the flame exhibited three distinct evolution modes(Type Ⅰ,Type Ⅱ,and Type Ⅲ)depending on the initial pressure and mesh porosity.In Type Ⅰ and Type Ⅱ modes,the metal wire mesh dem-onstrated a significant inhibitory effect on flame propagation.However,in Type Ⅲ,the flame penetrated the mesh and underwent violent acceleration and oscillation,indicating that the mesh promoted flame propagation.The velocity at which the flame entered the metal wire mesh was identified as a critical indicator of the evolution mode.When the velocity was low,the quenching effect of the metal wire mesh dominated,effectively suppress-ing the flame;conversely,when the velocity was high,the turbulence enhancement effect dominated,potential-ly exacerbating the explosion intensity.