Investigation of Visualization Measurement of Three-Dimensional Density Distribution near Mirror-Finished Heated Wall Surface Using Background Oriented Schlieren Method

Abstract

The Background Oriented Schlieren (BOS) method is an optical visualization technique for flow fields using background images. In recent years, 3D-BOS has been studied to capture the three-dimensional flow by taking simultaneous images from multiple directions. However, in the measurement of 3D density distribution around a heated wall, it is difficult to obtain the necessary refraction data from multiple directions because the wall blocks most of the light rays. In this study, we investigate the possibility of 3D visualization measurement near the heating wall by using the reflection of light from the mirror-finished wall surface.