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为研究车库内氢气连续性泄漏的浓度分布和聚集状态,采用ICEM-CFD软件建模,利用Fluent软件对氢气连续性泄漏过程进行了模拟。通过分析监测点氢气物质的量分数、氢气分布和可燃性区域体积分数,研究了横梁及其间距(L)、自然通风、通风口面积(A)对车库内氢气的扩散和分布状态的影响。结果表明:在密闭状态下,无横梁时可燃性区域最小,L=3 m时可燃性区域最大;当A=0.5 m2时,在自然通风的作用下,车库底部氢气物质的量分数明显下降,但车库中部和上部氢气物质的量分数与密闭时相近;当A=1 m2时,虽然初始阶段氢气物质的量分数上升很快,但很快就趋于稳定,监测点氢气物质的量分数均在爆炸下限以下,此时自然通风能够消除氢气爆炸的风险。
In order to study the concentration distribution and aggregation state of continuous hydrogen leakage in the garage, ICEM-CFD software was used to model the continuous hydrogen leakage process by using Fluent software. By analyzing the hydrogen content, the distribution of hydrogen and the volume fraction of flammable zone, the effects of crossbeam and its spacing (L), natural ventilation and vent area (A) on the diffusion and distribution of hydrogen in the garage were studied. The results show that the flammability zone is the smallest when the beam is closed and the maximum flammability zone when L = 3m. When A = 0.5 m2, the amount of hydrogen in the bottom of the garage decreases obviously under the condition of natural ventilation, However, the volume fraction of hydrogen in the middle and upper part of the garage is close to that of airtightness. When A = 1 m2, the hydrogen fraction in the initial stage rapidly rises but quickly stabilizes. Below the lower explosive limit, natural ventilation eliminates the risk of hydrogen explosions.