ENDGAME - Laboratory Experiment 2023-02-23 Exp. 004 - 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.本数据集围绕结合高速纹影阴影摄影（Schlieren shadow photography）的激波管（Shock-tube）实验展开。 激波管装置由高压储腔通过隔膜脉冲阀连接圆柱管构成，该阀门可将高压气体快速释放至常压管道内。高压储腔充装相对于环境压力的压缩空气，最大过压可达8巴。实验用管道可处于空置状态（即填充环境条件下的空气），或充装定量流体（水或粘性流体）或微小颗粒。本次实验采用了不同内径（3 cm与4 cm）及不同长度（30 cm与80 cm）的管道，图像采集帧率为30000 fps（帧每秒）。 当阀门开启时，会产生射流，伴随激波及声波在大气中传播，此类现象可通过高速纹影阴影摄影技术清晰观测到。