Simultaneous visualization of the particle cloud and flame in dust explosions
Sprache des Titels:
Proceedings of the 20th International Symposium on Flow Visualization (ISFV)
Dust deflagration remains a severe safety hazard in process industries. From a modelling perspective there is still long way to go to capture all aspects of dust explosions correctly. CFD Modelling activities in this field of research triggered the need for in-house high-fidelity validation data. A common approach to obtain experimental data on dust deflagration is to use high-speed cameras at sufficient frame rates. This usually leads to a trade-off in camera shutter settings so that either the dust cloud remains underexposed and is hardly visible, or the flame is too bright and saturates the pixels. In the present paper we propose a setup that uses a laser light sheet to illuminate the particle cloud while, at the same time, the camera settings can be chosen in way that pixel saturation can be kept on a low level in the flame area. The recordings are done with a color high-speed camera then processed in the YCbCr color space. Beside macroscopic values like the vertical dust cloud and flame propagation velocities we also obtain spatially resolved velocity data by using optical flow algorithms.