ENDGAME - Laboratory Experiment 2023-02-21 Exp. 015 - 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.本数据集依托激波管（Shock-tube）实验与高速纹影阴影摄影（Schlieren shadow photography）技术的结合构建。 该激波管实验装置由高压储气段与圆柱形实验管组成，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实验管内。高压储气段充装的压缩空气相对于环境压力具有设定过压值，最高可达8巴（bar）。实验管可空置（即填充环境条件下的空气），或充入定量流体（水或粘性流体）或微小颗粒。本实验采用内径分别为3 cm与4 cm、长度分别为30 cm与80 cm的实验管。图像采集帧率为30000 fps。 当膜片脉冲阀开启时，会产生射流，同时伴随冲击波与声波在大气中传播，这些现象可通过高速纹影阴影摄影技术清晰显现。