ENDGAME - Laboratory Experiment 2023-02-21 Exp. 016 - 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）的激波管实验。

本激波管装置由高压储气罐与圆柱形管道通过膜片脉冲阀连接构成，该阀可将加压气体快速释放至处于环境压力下的管道中。高压储气罐内填充的压缩空气相对于环境压力存在设定过压，最大过压可达8巴（bar）。实验所用管道可为空管（即内部为环境条件下的空气），或填充设定量的流体（水或粘性流体），亦或填充微小颗粒。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，激波与声波在大气中传播，借助高速纹影阴影摄影技术可清晰观测到上述波动的传播过程。