【摘要】 目的分析燃气流速及室外风速变化对建筑物内燃气泄漏火灾蔓延的影响,为火灾发生时火场内人员逃生及灭火救援提供理论指导.方法使用标准k-ε湍流模型和非预混燃烧模型,对民用建筑室内燃气泄漏火灾蔓延情况进行数值模拟.结果得到了不同边界条件下室内燃气火灾的温度场及组分浓度场的分布情况,并对结果进行了对比、分析.结论当燃气流速在0.5~2.0 m/s之间时,火灾热烟气层最慢将在5 min之内降至距地面2 m处,将对火灾中人员生命安全造成很大的威胁.当可燃物较少的情况下,室外风的吹入将对室内燃气泄漏火灾有稀释作用.更多还原

【Abstract】 The fire spread situations influnced by the flow velocities of gas leakage and outdoor air velocity are analyzed.The analysis theoretically contributes a lot to fire prevention and control,human evacuation and rescue in fire.The indoor gas leakage fire in residential building is simulated based on the non-premixed combustion turbulent model and κ-ε turbulent model.Under different boundary conditions,the fields of temperature and composition densities are obtained and displayed on a 3D space.The results show that when the flow velocity of gas varies between 0.5?m/s and 2.0?m/s,the hot smoke layer will fall to 2?m above the floor in 5 minutes,which will result in great risk on human life safety in fire.While combustible material is not much enough,the outdoor air will dilute the fire smoke density and slow down the smoke spread velocity.更多还原