前方垂直障碍物下水平喷射火特性研究

Research on Horizontal Fire Jet Characteristics under Vertical Obstacles Ahead

摘要: 燃气泄漏喷射火受到多种因素影响，其中前方垂直障碍物的限制和泄漏气体的流速会对喷射火的破坏半径及破坏程度产生影响。本文通过数值模拟不同情况下的燃气泄漏喷射火，研究受前方垂直障碍物限制下的火焰热辐射损失与甲烷浓度分布。结果表明，随着孔–板间距的增加，墙面的热辐射损失和分布范围逐渐变小，但泄漏孔与障碍物表面之间的热辐射损失分布增加，随着燃气泄漏速率增加，墙面热辐射损失增大；前方障碍物墙面上，孔–板间距与甲烷浓度及分布范围成反比，但气体泄漏速率与甲烷浓度和分布范围成正比。

Abstract: The leakage and jetting of gas fires are influenced by various factors, among which the restriction of vertical obstacles ahead and the flow rate of leaking gas will affect the radius and extent of fire jetting. In this paper, numerical simulations of gas leakage jetting fires under different conditions are conducted to study the flame thermal radiation loss and methane concentration distribution under the restriction of vertical obstacles ahead. The results indicate that with the increase of hole-plate spacing, the thermal radiation loss and distribution range on the wall gradually decreased, but the thermal radiation loss distribution between the leaking hole and the obstacle surface increases. With the increase of gas leakage rate, the wall thermal radiation loss increases. On the wall of the forward obstacle, the hole-plate spacing is inversely proportional to the methane concentration and distribution range, but the gas leakage rate is directly proportional to the methane concentration and distribution range.