ENDGAME - Laboratory Experiment 2024-01-16 Exp. 003 - 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（Schlieren Shadow Photography）的激波管实验。 该激波管装置由高压储腔（High-Pressure Reservoir）通过隔膜脉冲阀（Diaphragm Pulse Valve）与圆柱形管道相连，该阀门可将高压气体快速释放至常压管道内。高压储腔填充有相对于环境压力具有设定超压的压缩空气，最大超压可达8巴。管道可为空态（即填充环境条件下的空气），或填充定量的细小颗粒。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，同时配置了两种不同容积的高压储气腔（约650立方厘米与约1550立方厘米）。在导管排气口处安装了压力传感器（Pressure Sensor），用于记录实验过程中的压力变化。高速相机以30000帧每秒（fps）的帧率采集实验图像。 当阀门开启时，会产生射流，伴随激波与声波在大气中传播，这些现象可通过高速纹影阴影摄影直观显现。