ENDGAME - Laboratory Experiment 2023-02-22 Exp. 007 - 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.结合高速纹影阴影摄影（Schlieren shadow photography）技术的激波管实验。 本激波管实验装置由高压储气罐与圆柱形管段构成，二者通过膜片脉冲阀相连，该阀可将高压气体快速释放至常压管段内部。高压储气罐内填充的压缩空气相对环境压力具备设定过压，最大过压可达8 bar。实验管段可采用空管（即内部为环境条件下的空气），或填充设定量流体（水或粘性流体），亦或填充细小颗粒。本实验选用了不同内径（3 cm与4 cm）及不同长度（30 cm与80 cm）的管段，图像采集帧率为30000 fps。 当膜片脉冲阀开启时，会产生射流，伴随激波及声波在大气中传播，而高速纹影阴影摄影技术可使此类流场现象清晰可视。