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长期以来人们都在研究当用探针测定火焰结构时,采样中所引起的热力和化学特性的畸变,尤其在分子束采样时,由于探头比一般的微型探针要大得多、更加引起研究者对此问题的关心,这一点可以由大量的实验和理论研究文献中得到证实。 在分子束采样技术中,有时采用测定分子的平均运动速度,再经过一定的计算来确定源点(source)的气体温度,这种方法通常称为“飞行时间”温度测量法(Time-of-Flight Temperature Measurments,以下简称TOF)。将用本方法测定的温度曲线与其他方法所得的数值加以比较,即可获得热力畸变的精确图象。 本文报导了用TOF测温法在低燃烧压力(100托和50托)下H_2/O_2/Ar火焰温度的测量结果和分析。
For a long time, people have been studying the thermal and chemical distortion caused by sampling when using the probe to measure the flame structure. Especially in the case of molecular beam sampling, since the probe is much larger than a typical microprobe, Concern over this issue can be confirmed by a large body of experimental and theoretical literature. In molecular beam sampling techniques, the average velocity of a molecule is sometimes measured and then a certain calculation is performed to determine the source gas temperature, a technique commonly referred to as Time-of- Flight Temperature Measurments, hereinafter referred to as TOF). The temperature curve measured by this method is compared with the values obtained by other methods to obtain an accurate image of thermal distortion. This paper reports the results of the measurement and analysis of the H 2 O 2 / Ar flame temperature at low combustion pressures (100 torr and 50 torr) using TOF thermometry.