Enhanced stabilization of multiple premixed flames with a compressive vortex pair on a stratified burner
Journal
Combustion Science and Technology
Journal Volume
187
Journal Issue
9
Pages
1452-1467
Date Issued
2015
Author(s)
Abstract
An innovative burner design for premixed combustion demonstrates combustion phenomena and stability relevant to high flame/flow interaction. The burner generates a compressive vortex-pair structure to expand the region of stable flame operation (φ = 0.5 under an open-flame condition). The stabilized effects between flames and flow structure were explored, particularly the preheating and mixing characteristics. The flow visualization and velocity distribution measured with particle-image velocimetry (PIV) (1280×1024 pixels at 1000 Hz) show that the compressive vortex-pair structure is induced by inner-injection and middle-injection wake vortices in combination. The evolution of the transient flow and statistical analysis show that the compressive vortex-pair structure effectively induces greater turbulent intensity to enhance the flame intensity, and thus achieves a salient performance of stabilization. This work provides a valuable concept for the application of a stratified burner for bio-syngas combustion because of its flexible control and capability to stabilize a flame.
SDGs
Type
journal article