Gas Movements in Front of Flames Propagating Across Methanol
Gas Movements in Front of Flames Propagating Across Methanol
复制标题
火焰前的气体在甲醇中传播
DOI：
10.1080/00102208008952373
复制
发表时间：
1980
影响因子：
1.9
通讯作者：
Norio Tanabe
中科院分区：
文献类型：
--
作者：
T. Hirano;Takuji Suzuki;Ichiro Mashiko;Norio Tanabe
用高速纹影照相结合热气示踪技术测量了初始温度为-5℃~35℃时，火焰在甲醇中传播的前缘的气体速度分布。对于远低于闪点TLF的热释光，在火焰前沿前方观察不到明显的气体运动。因此，如以往的研究所认为的，这种情况下的预热主要是由液体中的对流引起的。对于TL略低于TLF的情况，外推火焰锋面上的气体速度的最大值是相当高的。考虑到预热引起的火焰前缘甲醇蒸汽浓度的增加，这一结果可以得到一致的解释。对于TLF以上的热释光，实验预测的火焰前缘附近的气体运动方向与火焰传播的理论预测方向一致。
Abstract The gas velocity profiles in front of the leading edges of flames propagating across methanol at initial temperatures Ti from -5°C to 35°C were measured by using high-speed schlieren photography combined with a hot gas tracer technique. For Tl much lower than the flash point Tlf, any appreciable gas movement could not be observed in front of the leading flame edge. Therefore, as considered in previous studies, preheating in this case was supposed to be mainly caused by convection in the liquid phase. For Tl slightly lower than Tlf, the maximum value of the extrapolated gas velocity across the flame front was found to be a fairly high value. This result could be consistently intepreted by considering the increase of the methanol vapor concentration in front of the leading flame edge due to preheating. For Tl above Tlf, the experimentally predicted aspects of the gas movements near the leading flame edges were found to coincide with the theoretically predicted aspects for the flame propagation thro...