泄压口面积对氢⁃空气爆燃特性的影响

Influence of pressure relief port area on hydrogen⁃air detonation characteristics

为探究不同泄压口面积对氢⁃空气火焰形态演化的影响,采用自建实验平台进行氢⁃空气爆炸实验,并利用OpenFOAM开源软件进行数值模拟,分析不同泄压口面积(0、25%、50%、75%、100%)下的爆燃特性和火焰形态。结果表明:泄压口面积对火焰形态影响较小,但影响火焰形成时刻。随着泄压口面积增大,郁金香火焰传播速度增大,爆燃压力降低,且峰值出现时刻延迟。泄压口面积的变化通过影响未燃气体的流场结构进而影响火焰形态,较小的泄压口面积有利于未燃气体形成漩涡结构,促进平板火焰和郁金香火焰的形成。泄压口面积是影响氢气火焰形态和爆燃特性的重要因素,通过优化泄压口结构参数,可以有效控制氢气火焰的传播速度和爆燃压力,降低爆炸风险,对氢能安全使用具有重要意义。

To investigate the influence of different pressure relief port areas on the evolution of hydrogenair flame morphology,a selfbuilt experimental platform was used for hydrogen air explosion experiments,and OpenFOAM open source software was used for numerical simulation to analyze the detonation characteristics and flame morphology under different pressure 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 propagation speed of the tulip flame increases,the detonation pressure decreases,and the peak appearance time is delayed.The change in pressure relief port area affects the flow field structure of unburned gas and thus affects the flame shape.A smaller 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 relief port is an important factor affecting the shape and detonation characteristics of hydrogen flames.By optimizing the structural parameters of the pressure relief port,the propagation speed and detonation pressure of hydrogen flames can be effectively controlled,reducing the risk of explosion and having significant implications for the safe use of hydrogen energy.