ENDGAME - Laboratory Experiment 2024-01-18 Exp. 008 - High Speed Camera data

Shock-tube experiments in combination with high speed Schlieren shadow photography. The shocktube setup consists of a high-pressure reservoir connected with a cylindrical tube through a diaphragm pulse valve which allows a fast release of pressurized gas into the ambient pressure tube. The high-pressure reservoir is filled with compressed air at a given overpressure with respect to ambient pressure (up to 8 bar). The pipe was either empty (i.e. with air at ambient conditions) or filled with a given amount of small particles. We adopted pipes an inner diameter of 4 cm and different lengths (20, 30 and 80 cm). We also considered different volumes of pressurized gas (~650 cm3 and ~1550 cm3). A pressure sensor has been placed at the vent of the conduit to record pressure variations during experiments. Images from the high speed camera were collected at a frame rate of 30000 fps. When the valve is open, a jet flow is produced, with shock and acoustic waves propagating in the atmosphere, which become visible due to the high speed Schlieren shadow photography.本数据集包含结合高速纹影阴影摄影技术的激波管实验。 激波管装置由高压储气罐通过膜片脉冲阀与圆柱管道相连，该阀可将加压气体快速释放至常压管道内。高压储气罐内填充的压缩空气相对于环境压力具备设定过压，最高可达8巴。实验所用管道可为空管（即内部为环境条件下的空气），或填充定量细小颗粒。本实验采用内径为4厘米、长度分别为20、30和80厘米的管道，同时设置了两种容积的加压气体，分别约为650 cm³与1550 cm³。我们在管道排气口处安装了压力传感器，用于记录实验过程中的压力变化。高速相机的图像采集帧率为30000帧每秒（fps）。 当阀门开启时，会产生射流，伴随激波与声波在大气中传播，而高速纹影阴影摄影技术可使这些流动现象可视化。