ENDGAME - Laboratory Experiment 2023-06-22 Exp. 009 - 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 fluids (water or viscous fluid) or small particles. We adopted pipes with different inner diameters (3 and 4 cm) and different lengths (30 and 80 cm). Images 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.本数据集基于激波管（shock-tube）实验结合高速纹影阴影摄影（Schlieren shadow photography）技术构建。 激波管实验装置由高压储气罐与圆柱形管路通过膜片脉冲阀连接构成，该阀可将高压气体快速释放至常压管路中。高压储气罐内填充的压缩空气相对于环境压力具有设定的过压值，最高可达8巴（bar）。实验管路可保持空载状态（即内部为环境条件下的空气），或填充设定量的流体（水或粘性流体），亦或填充微小颗粒。本实验采用了不同内径（3厘米与4厘米）及不同长度（30厘米与80厘米）的管路，图像采集帧率为30000帧每秒（fps）。 当膜片脉冲阀开启时，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清晰可视。