Reservoir gas temperature measurement in detonation driven shock tunnel by chemical temperature scale
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摘要: 为直接测定驻室温度,以预混于实验气体中微量四氟甲烷CF4在高温下热分解反应的动力学分析为基础,采用一个快速单向进样阀于喉道前部对反射激波后的气体进行采样,通过气相色谱方法检测反应终产物四氟乙稀C2F4的浓度作为温度指示,测量激波风洞中反射激波后驻室的温度。应用于最新研制成功的爆轰驱动激波风洞驻室温度测量的结果显示其采样技术及化学温标方法是适用的。讨论了用氢氧爆轰驱动产生的管壁凝结水对测量的影响。Abstract: For measuring the temperature of reservoir gas in the detonation driven shock tunnel (DDST) directly, argon is used as the driven gas with small amount of CF4 added as reagent to produce the temperature indicator C2 F4 based on a kinetic analysis of the thermal decomposition during the shock process. By using a high speed one-way valve connected directly to the shock tunneljust ahead of the entrance of the nozzle, a sarnpling system is constructed to sample the reservoir gas to a gas chromatography. The experimental results show that the sampling technique suggested here is available and the chemical temperature scale determined is convenient. The effects of condensation water on the wall of the driven section, as we use the oxyhydrogen detonation as the driven gas, are also discussed.
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