Flame dynamics and structure within sub-millimeter combustors

✍ Scribed by Shaurya Prakash; Adrian D. Armijo; Richard I. Masel; Mark A. Shannon

• Book ID: 102691118
• Publisher: American Institute of Chemical Engineers
• Year: 2007
• Tongue: English
• Weight: 594 KB
• Volume: 53
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.11180

✦ Synopsis

Abstract

Non‐premixed methane‐oxygen flame dynamics and structures confined within an alumina combustor are described. Non‐stabilized, transient flame dynamics and phenomena leading to the formation of a stable edge‐like flame and distinct cellular structures that take place within combustor channels of dimensions 35 mm long, 5 mm wide, and 0.75 mm high (combustor volume ∼ 130 mm^3^) are discussed. These confined flames are surveyed by measuring the external wall temperatures, high‐speed and still‐frame visual flame imaging, recordings of emitted acoustics from the combustor, and capturing visible, CH*, and OH* chemiluminescence through a sapphire window. The observed dynamic flame structure is an oscillating edge‐like flame accompanied by ignition‐extinction events that precede the formation of a stable edge‐like flame and flame cells in the reaction channel. The cellular flame structures in all cases exhibit a confined tribrachial structure with a folded or extinguished rich branch while the lean branch survives. © 2007 American Institute of Chemical Engineers AIChE J, 2007