Schlieren Image Velocimetry and colorimetry for a burning candle and its thermal plume

Abstract

This article explores the feasibility of generating velocity maps for a flame and its plume from a burning candle using Schlieren Image Velocimetry (SIV). Currently, SIV is predominantly employed in the literature to track highly turbulent flows by using the developing eddies as flow markers. The novelty of this study lies in evaluating the quality of a nearly laminar flame, which exhibits significant background density variation due to its own plume. In addition to the SIV technique, a brief assessment is conducted using a segmented color filter, specially designed and manufactured to evaluate the potential for measuring the temperature range of the flame.