Cavity Flame-Holders for Ignition and Flame Stabilization in Scramjets: An Overview

This paper describes ongoing research efforts in the scramjet community on cavity ame holders, a concept for ame holding and stabilization in supersonic combustors. During the last few years, cavities have gained the attention of the scramjet community as a promising ame-holding device, owing to results obtained in ight tests and to feasibility demonstrations in laboratory-scale supersonic combustors. However, comprehensive studies are needed to determine the optimal con guration that will yield the most effective ame-holding capability with minimum losses. The ow eld characteristics of cavities and research efforts related to cavities employed in low-and high-speed ows are summarized. Open questions impacting the effectiveness of the cavities as ame holders in supersonic combustors are discussed. I.