Visualization of Shock Wave Propagation in a Shock Tube Using the BOS Method

In this report, we visualized the propagation of a shock wave inside a rectangular tube using the Background-Oriented Schlieren (BOS) method. The imaging was conducted by attaching a rectangular tube with a visualization window made of acrylic plates to the end of the shock tube. Using a digital camera, we successfully detected background distortion in the tube, allowing measurement of vortex flow. However, the primary shock wave was not clearly visualized, which is likely due to the long exposure time and unstable flow conditions. To resolve this, we aim to improve the clarity of BOS result by optimizing the exposure time and timing of the photography.