ENDGAME - Laboratory Experiment 2024-01-17 Exp. 022 - 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.本数据集收录结合高速纹影阴影摄影（high speed Schlieren shadow photography）的激波管（shock-tube）实验数据。 激波管实验装置由高压储气瓶与圆柱形管段通过膜片脉冲阀（diaphragm pulse valve）连接组成，该阀可将高压气体快速释放至常压管段内。高压储气瓶内充装的压缩空气相对于环境压力具有设定过压，最高可达8巴。管段内部可保持为空（即填充环境条件下的空气），或装填定量的细小颗粒。本实验采用内径为4厘米、长度分别为20、30和80厘米的管段，同时使用了两种不同容积的高压储气腔，容积约为650立方厘米与1550立方厘米。在导管排气口处安装有压力传感器（pressure sensor），用于记录实验过程中的压力变化。高速相机以30000帧每秒的帧率采集图像。 当阀门开启时，会产生射流（jet flow），伴随冲击波与声波在大气中传播，上述现象可通过高速纹影阴影摄影技术清晰显现。