FLAME facility: The effect of obstacles and transverse venting on flame acceleration and transition on detonation for hydrogen-air mixtures at large scale
FLAME facility: The effect of obstacles and transverse venting on flame acceleration and transition on detonation for hydrogen-air mixtures at large scale
复制标题
火焰设施：障碍物和横向通风对大规模氢空气混合物爆炸的火焰加速和过渡的影响
DOI：
10.2172/6045935
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
W. B. Benedick
中科院分区：
文献类型：
--
作者：
M. P. Sherman;S. Tieszen;W. B. Benedick
本报告介绍了在FLAME设施中进行的氢-空气混合物火焰加速和燃烧转爆轰（DDT）研究，并介绍了其与核反应堆安全的相关性。火焰加速和DDT会产生高峰压力，可能导致安全壳失效。FLAME是一个长30.5米、高2.44米、宽1.83米的大型矩形通道。它在点火端关闭，在远端打开。三个试验变量是氢摩尔分数（12- 30%）、横向排气程度（通过移动钢顶板--0%，13%和50%）和通道中是否存在某些障碍物（零或33%堵塞率）。最重要的变量是氢的摩尔分数。与没有障碍物的类似测试相比，测试的障碍物的存在大大增加了火焰速度、超压和DDT的趋势。不同的障碍物配置可能会对火焰加速和DDT产生或大或小的影响。大程度的横向通风降低了火焰速度、超压和DDT的可能性。对于小程度的横向排气（13%顶部排气），火焰速度和超压高于反应性混合物（> 18%H/sub 2/）的无横向排气，但它们低于更贫的混合物。由流出通风口的气流产生的湍流对增加火焰速度的影响可能大于将气体排出通道的影响，因此降低了超压。在没有障碍物和50%顶部排气的情况下，火焰速度和超压都很低，并且没有DDT。对于所有其他情况下，观察到DDT高于某一阈值氢浓度。DDT在15%H/sub 2/时获得，有障碍物且无横向通风。参考文献67篇，62图。«少
This report describes research on flame acceleration and deflagration-to-detonation transition (DDT) for hydrogen-air mixtures carried out in the FLAME facility, and describes its relevance to nuclear reactor safety. Flame acceleration and DDT can generate high peak pressures that may cause failure of containment. FLAME is a large rectangular channel 30.5 m long, 2.44 m high, and 1.83 m wide. It is closed on the ignition end and open on the far end. The three test variables were hydrogen mole fraction (12--30%), degree of transverse venting (by moving steel top plates---0%, 13%, and 50%), and the absence or presence of certain obstacles in the channel (zero or 33% blockage ratio). The most important variable was the hydrogen mole fraction. The presence of the obstacles tested greatly increased the flame speeds, overpressures, and tendency for DDT compared to similar tests without obstacles. Different obstacle configurations could have greater or lesser effects on flame acceleration and DDT. Large degrees of transverse venting reduced the flame speeds, overpressures, and possibility of DDT. For small degrees of transverse venting (13% top venting), the flame speeds and overpressures were higher than for no transverse venting with reactive mixtures (>18% H/sub 2/), but they were lower withmore » leaner mixtures. The effect of the turbulence generated by the flow out the vents on increasing flame speed can be larger than the effect of venting gas out of the channel and hence reducing the overpressure. With no obstacles and 50% top venting, the flame speeds and overpressures were low, and there was no DDT. For all other cases, DDT was observed above some threshold hydrogen concentration. DDT was obtained at 15% H/sub 2/ with obstacles and no transverse venting. 67 refs., 62 figs.« less