Visualization of the decompression of supercritical carbon dioxide

这项工作旨在可视化超临界二氧化碳（CO2）在通道中的快速减压。进一步了解二氧化碳减压对于缓解与高压二氧化碳管道相关的长韧性裂缝至关重要。将对实验室现有的激波管设施进行改造，以适应拟议的二氧化碳减压试验。使用Photron SA5相机的高速纹影摄影系统将用于拍摄该事件。计划帧率在50-100 kHz之间。高速压电传感器将用于监测膨胀管上壁面的气体压力。这些传感器将提供减压事件的关键信息。它们还将用于跟踪向上游传播的膨胀波，并帮助确定何时应该终止数据采集周期。这些实验将为验证用于预测二氧化碳管道破裂事件的数值模型提供关键数据。

This work aims to visualize the rapid decompression of supercritical carbon dioxide (CO2) in a channel. Further understanding of CO2 decompression is critical for the mitigation of long, ductile fractures associated with high-pressure CO2 pipelines. An existing shock tube facility in the lab will be modified to accommodate the proposed CO2 decompression tests. A high-speed schlieren photography system, using a Photron SA5 camera, will be used to photograph the event. Framing rates between 50-100 kHz are planned. High-speed piezoelectric sensors will be used to monitor gas pressure along the expansion tube upper wall surface. These sensors will provide key information on the decompression event. They will also be used to track expansion waves traveling upstream and help determine when the data acquisition period should be terminated. The experiments will provide key data needed to validate numerical models used to predict CO2 pipeline fracture events.