ENDGAME - Laboratory Experiment 2023-02-22 Exp. 005 - 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实验结合高速纹影阴影摄影技术（high speed Schlieren shadow photography）构建。
激波管实验装置由高压储腔、圆柱形管道及膜片脉冲阀（diaphragm pulse valve）组成，该阀可快速将加压气体释放至常压管道中。高压储腔内填充的压缩空气相对于环境压力存在设定超压，最大超压可达8巴。实验所用管道可处于空置状态（即内部为环境条件下的空气），或填充定量流体（水或粘性流体（viscous fluid）），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）的管道，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，激波与声波将在大气中传播，而高速纹影阴影摄影技术可使这些波动清晰显现。