To investigate the influence of different pressure re-lief port areas on the evolution of hydrogen-air flame morphol-ogy,a self-built experimental platform was used for hydrogen air explosion experiments,and OpenFOAM open source soft-ware was used for numerical simulation to analyze the detona-tion characteristics and flame morphology under different pres-sure relief port areas (0,25％,50％,75％,100％) . Results show that the area of the pressure relief port has little effect on the flame shape,but it affects the timing of flame formation. As the area of the pressure relief port increases,the propaga-tion speed of the tulip flame increases,the detonation pres-sure decreases,and the peak appearance time is delayed. The change in pressure relief port area affects the flow field struc-ture of unburned gas and thus affects the flame shape. A smal-ler pressure relief port area is conducive to the formation of vortex structures in unburned gas,promoting the formation of flat plate flames and tulip flames. The area of the pressure re-lief port is an important factor affecting the shape and detona-tion characteristics of hydrogen flames. By optimizing the structural parameters of the pressure relief port,the propaga-tion speed and detonation pressure of hydrogen flames can be effectively controlled,reducing the risk of explosion and hav-ing significant implications for the safe use of hydrogen ener-gy.
premixed hydrogen-air deflagrationpressure relief port areatulip flamelarge eddy simulationOpenFOAM
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