| 激波管内水汽相变滞后效应的实验研究 |
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| 引用本文： | 傅云飞,韩肇元,龚闽卫.激波管内水汽相变滞后效应的实验研究[J].大气科学,1996,20(3):352-358. |
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| 作者姓名： | 傅云飞 韩肇元 龚闽卫 |
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| 作者单位： | 中国科学技术大学力学和机械工程系,合肥 230026 |
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| 基金项目： | 本研究在国家科委基础性研究和博士后科学基金资助下完成 |
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| 摘 要： | 本文研究了激波管中稀疏波、反射稀疏波对水汽-空气混合气体作用的非定常瞬态相变过程。利用两种不同波长光束的消光方法对水汽相变过程进行了测试。结果表明:水汽非定常瞬态相变发生的温度远远低于出现于自然大气中的凝结或冻结温度，混合气体膨胀越强，水汽瞬态相变的温度越低。非定常瞬态膨胀时的压力迅速下降是水汽瞬态相变温度远远低于自然大气中水汽相变温度的主要原因。水汽瞬态相变过程中，生成的微滴尺度均匀，但微滴的数密度却随时间发生变化。
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| 关 键 词： | 激波管 稀疏波 相变 |
Experimental Investigation of the Delay Effect of Phase Transformation of Water Vapor in Shock Tube |
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| Fu Yunfei,Han Zhaoyuan and Gong Minwei.Experimental Investigation of the Delay Effect of Phase Transformation of Water Vapor in Shock Tube[J].Chinese Journal of Atmospheric Sciences,1996,20(3):352-358. |
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| Authors: | Fu Yunfei Han Zhaoyuan and Gong Minwei |
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| Abstract: | Processes of the unsteady transient phase transformation of water vapor and gas mixture induced by rarefaction waves and reflected rarefaction waves in a shock tube were studied experimentally. The phase transformation processes of water vapor were measured by dual--wavelength light extinction method. The experimental results show that the temperature for the unsteady transient phase transformation of water vapor is much lower than the condensing--point or freezing--point occurring in the atmosphere. The more the mixture gas expands, the lower the temperature point for the transient phase transformation of water vapor is. It is mainly because the pressure of the gas mixture decreases rapidly during the processes of transient expansion that the temperature of transient the phase transformation of water vapor is much lower than that of an equilibrium phase trans.formation of water vapor. It is also shown that during the processes of the unsteady transient phase transformation of water vapor the size of the formed droplets after the transient phase transformation is kept constant, but the number density changes with time. |
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| Keywords: | shock tube rarefaction waves phase transformation |
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