ENDGAME - Laboratory Experiment 2023-06-22 Exp. 002 - 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.

本数据集采用激波管（Shock-tube）结合高速纹影阴影摄影术（Schlieren shadow photography）开展实验。该激波管装置由高压储气罐与圆柱形管道组成，二者通过膜片脉冲阀连接，该阀可将高压气体快速释放至常压管道内。高压储气罐内填充的压缩空气相对于环境压力具备设定过压，最高可达8巴（bar）。管道内部状态可分为三类：为空（即充满环境条件下的空气）、填充定量流体（水或粘性流体），或填充微小颗粒。本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帧每秒（fps）。
当膜片脉冲阀开启时，会产生射流，同时激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术清晰呈现。