ENDGAME - Laboratory Experiment 2023-02-22 Exp. 003 - 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.本数据集为激波管实验，结合了高速纹影阴影摄影（Schlieren shadow photography）技术。 该激波管装置由高压储腔与圆柱形管道通过膜片式脉冲阀连接而成，该阀可将高压气体快速释放至常压管道内。高压储腔填充有相对于环境压力具有指定过压的压缩空气，最大过压可达8巴。管道可处于空置状态（即填充环境条件下的空气），或填充指定量的流体（水或粘性流体）或微小颗粒。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。 当膜片式脉冲阀开启时，会产生射流，伴随激波与声波在大气中传播，而这些现象可通过高速纹影阴影摄影清晰显现。