The role of flow interaction in flame–flame interaction events in a dual burner experiment

Abstract

A dual burner experiment is used to investigate how flow interactions affect local flame-flame interaction in turbulent premixed flames. The presence of adjacent flows influences the local structure of these flames and understanding the sensitivity of these flames to adjacent flows is essential for multinozzle combustion devices. To study this sensitivity, a high-aspect-ratio Bunsen flame operating at a constant flow velocity is placed adjacent to an identical burner with non-reacting flow at varying velocities. High-speed OH-planar laser induced fluorescence and stereoscopic-particle image velocimetry measurements are performed to capture flame-front locations and velocity fields. A non-rigid image registration technique is used to calculate the local flame-area variations that occur due to topological differences, and conditional statistics are extracted to relate the local behavior to changes observed in the global behavior of the flames. Extracted flame curvatures and time-averaged progress variables conditioned on flame-flame interactions show differences existing in the inner and outer flame branches near the flame-attachment region. Statistics of these results are presented and compared for all test cases.

Numerical Analysis of Hydrogen-Methane Flame in Different Header Types of Premixed Combustors

“…They suggested that the maximum flame length decreases as the number of slits increases, and the shear layer between flames can cause flame surface distortion due to vortex action. Tyagi et al [20] conducted an experimental study of local flame-fire interaction in turbulent premixed flames. They suggested that when there is high shear flow between adjacent flames, a local interaction occurs in which the flame structure bends toward the flame center.…”

Experimental Study on Flame Response Characteristics of a Non-Premixed Swirl Model Combustor

“…This coupling is particularly prominent under lean fuel conditions, where the flame is close to its extinction limit, making it more susceptible to inlet disturbances. From the perspective of interaction processes, the interaction between the flame and the vortex behind the flame stabilizer [3,4], inter-flame collisions [5], and the interaction between the flame and sound waves [6,7] all have a significant impact on the stability of a combustion system. Extensive experimental and numerical simulation studies [8][9][10][11] have been conducted by researchers both domestically and internationally, aiming to deepen the understanding of sound wave and heat release behavior from the perspective of physical coupling mechanisms.…”