CO2膨胀机内部快速降压相变膨胀过程的可视化试验研究

VISUAL EXPERIMENTAL RESEARCH ON EXPANDING AND PHASE CHANGE PROCESS IN CO_2 EXPANDER

随着对于CO_2膨胀机研究问题的不断深入,相关的一些影响膨胀机效率和稳定性的关键性问题随即被提出,其中膨胀机内部流体的膨胀相变过程是重要的影响因素之一。本文通过对膨胀机的内部改造,添加LED内部光源,嵌入承受高压的石英玻璃视窗,并结合CO_2热泵系统以及高速摄影仪图像采集系统,建立了膨胀机内部流动可视化观测试验台,进行了一系列探索试验。捕捉了不同转速下、不同质量流量的多组连续数据图像,基于图像处理技术,获得了一些膨胀相变过程中的相关信息,并结合膨胀机性能曲线研究了相变过程与膨胀角度的变化关系,希望能为以后高效膨胀机开发提供参考依据。

With paying attention to the problem of CO2 expanders, the key issues on influencing efficiency and stability of expanders were put forward. In which the expanding and phase change process in expander is one of important factors. Through rebuilt the CO2 expander structure, added LED light source, and installed internal high-pressure quartz windows, the visual observation experimental rig of expander was established by use of CO2 heat pump and high speed camera, and carried out a series of explore experiments. A lot of continuous pictures of internal phase change process at different speed and different mass flow were obtained. The relevant information of expanding and phase change process was received based on image processing technology, and the relationship between expansion angles and phase change was researched combined with the performance curve of expander. It hopes to Drovide a, little reference evidence for developing high-performance expander.