Analysis of flame propagation using an imaging technique BOS (Background Oriented Schlieren) and PIV (Particle Imaging Velocimetry).

Abstract

An experimental and simulation work has been conducted to study premixed flame propagation using imaging technique BOS (background oriented schlieren) and PIV (particle imaging velocimetry). Flame images obtained from experiment and computation using PIVlab 1.41 were used for studies. The BOS (background oriented schlieren) technique is a newly established method for easily and inexpensive visualizing density gradient variation in compressible flows. The BOS setup design consists primarily of a background with random dots and a camera targeted on the dots. Variation of the density between the uninterrupted image and the distorted image resulted in a dots shift that is used by the optical flow method to generate displacement field. We present a simple 2D imaging method for measuring this distortion and then show how it can be used to visualize gas and liquid flows. In addition, several research questions associated to combustion and fluid mechanics are explored using high speed direct/schlieren imaging, PIV techniques, etc.