泄爆口参数对氢气火焰传播过程影响的数值模拟*

为了减少管内气体爆炸造成的损失与破坏，基于大涡模拟LES模型和Zimont燃烧模型，研究泄爆尺寸(直径为40，60，80 mm)和泄爆位置(侧方距点火端1，3，5 m)等泄爆条件对受限空间中氢气燃爆特性的影响。研究结果表明:大孔径泄爆口更好的排放效果造成火焰锋面在通过泄爆口时发生严重畸变，而泄爆口与点火端距离的增加则会削弱火焰锋面畸变的程度，且不同尺寸泄爆口产生的泄压效果差异较大。因此，应考虑将合适尺寸的泄爆口设置于靠近易燃点处。通过探索不同泄爆孔径与泄爆口位置对氢气火焰传播的影响规律，可为实际应用中的安全泄爆起到指导性作用。

Numerical simulation on influence of explosion vent parameters on flame propagation process of hydrogen

In order to reduce the damage caused by the gas explosion in the duct,the influence of explosion venting conditions including the explosion venting sizes (diameter of 40,60 and 80 mm) and the explosion venting positions (lateral distance of 1,3 and 5 m from the ignition end) on the combustion and explosion characteristics of hydrogen in the confined space was studied by using the large eddy simulation (LES) model and Zimont combustion model.The results showed that the better discharge effect of explosion vent with large diameter caused serious distortion of flame front when passing through the explosion vent,while the increase in the distance between explosion vent and ignition end would weaken the distortion degree of flame front,and the pressure relief effect generated by different sizes of explosion vent was quite different.Therefore,it should be considered to set the explosion vent with appropriate size near the flammable point.By exploring the influence of different explosion venting diameters and explosion vent positions on hydrogen flame propagation,the direction for safe explosion venting in practical application was pointed out.