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基于TDLAS的水蒸气非平衡凝结过程研究
TDLAS-based study on steam non-equilibrium condensation process
投稿时间: 2017-01-20  最后修改时间: 2017-04-27
DOI:
中文关键词:  水蒸气  凝结  可调谐半导体激光器吸收光谱技术(TDLAS)  温度测量
英文关键词:water vapor  condensation  Tunable Diode Laser Absorption Spectroscopy (TDLAS)  temperature measurement.
基金项目:自然基金(11202204);中央高校基本科研业务费专项资金(WK2091010001);高超声速冲压发动机技术重点试验室基金(20130101005)
作者单位E-mail
范新冬 中国科学技术大学 para@ustc.edu.cn 
金熠 中国科学技术大学 yjin@ustc.edu.cn 
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中文摘要:
      目前国内开展的高超声速飞行器地面模拟试验,尤其是较大尺度的高焓试验大部分在燃烧加热风洞中进行。气流在喷管的膨胀加速过程中温度快速降低,可能导致其中的水蒸气发生急剧凝结,这一过程会带来试验流场参数的改变。为了考察水蒸气的凝结过程,提出“空间转化为时间”思想,即将喷管中气流参数沿喷管流向的变化转换为膨胀过程中固定位置气流参数随时间的变化,设计搭建了一套模拟喷管凝结过程的试验装置,通过调节连接段最小截面积实现不同的时间尺度,采用片光技术实现凝结现象的观测,同时根据水蒸气和甲烷吸收光谱获得凝结过程中的温度变化以及水蒸气含量变化。结果表明:在试验段内通过片光可以观测到水蒸气的凝结现象;不同时间尺度下凝结过程中的温度变化趋势相近,均为先下降后上升,在温度趋势发生变化的时间点附近,水蒸气摩尔分数迅速下降,这一变化趋势与燃烧加热风洞喷管流动中参数变化的数值模拟结果具有较好的一致性;这种“空间转化为时间”的试验方案可以在一定程度上模拟喷管中水蒸气的凝结过程。
英文摘要:
      The gas temperature will reduce rapidly during the expansion process of a hypersonic nozzle flow, which may cause steam condensation particularly for combustion heated wind tunnel. This process will bring about the change of flow field parameters. In order to investigate the steam condensation process through nozzle, a new type of experimental device is deceloped. Change of flow parameters along a nozzle is converted to the change with time in a certain position during the flow expansion process. Three different time scales, which correspond different nozzle dimensions, are actualized by adjusting the sectional area valve of the connection segment. The steam condensation process is observed by planar laser scattering imaging. The water vapor concentration and temperature in the steam condensation process are obtained with Tunable Diode Laser Absorption Spectroscopy measurement system (TDLAS) based on water vapor spectral lines and methane spectral line. The condensation phenomena are captured by planar laser scattering imaging in the test section. It was also found that temperature evolutions have similar trends in different time-scales experiments, which is decreasing first then rising. Mole fraction of water vapor decreases rapidly and saturation reaches its peak when temperature trend changes, which are consistent with numerical simulation results. The new experimental device can simulate the process of water vapor condensation in wind tunnel flow for a certain extent.
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